U.S. patent application number 17/480030 was filed with the patent office on 2022-01-06 for method for preparing flavorful compounds isolated from black liquor and products incorporating the flavorful compounds.
The applicant listed for this patent is R.J. Reynolds Tobacco Company. Invention is credited to Michael Francis Dube, Anthony Richard Gerardi, Christopher Junker.
Application Number | 20220000168 17/480030 |
Document ID | / |
Family ID | |
Filed Date | 2022-01-06 |
United States Patent
Application |
20220000168 |
Kind Code |
A1 |
Junker; Christopher ; et
al. |
January 6, 2022 |
METHOD FOR PREPARING FLAVORFUL COMPOUNDS ISOLATED FROM BLACK LIQUOR
AND PRODUCTS INCORPORATING THE FLAVORFUL COMPOUNDS
Abstract
A method of isolating compounds from a tobacco-derived black
liquor, including receiving a black liquor from a pulping process
of an input material comprising a plant of the Nicotiana species,
treating the black liquor with an acid to lower the pH of the black
liquor to about 7 or lower in order to produce a precipitate and an
acidified black liquor, separating the precipitate and the
acidified black liquor, extracting the acidified black liquor with
an organic solvent in order to produce an organic layer extract and
an aqueous layer extract, and separating the organic layer extract
and the aqueous layer extract.
Inventors: |
Junker; Christopher;
(Pfafftown, NC) ; Dube; Michael Francis;
(Winston-Salem, NC) ; Gerardi; Anthony Richard;
(Winston-Salem, NC) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
R.J. Reynolds Tobacco Company |
Winston-Salem |
NC |
US |
|
|
Appl. No.: |
17/480030 |
Filed: |
September 20, 2021 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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15013751 |
Feb 2, 2016 |
11154087 |
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17480030 |
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International
Class: |
A24B 15/24 20060101
A24B015/24; A24B 15/28 20060101 A24B015/28; A24B 15/30 20060101
A24B015/30; D21C 11/00 20060101 D21C011/00 |
Claims
1-22. (canceled)
23. A tobacco product comprising a flavorant compound, the
flavorant compound being in the form of an organic extract of a
tobacco-derived black liquor.
24. The tobacco product of claim 23, wherein the flavor compound is
selected from the group consisting of acetic acid,
3,5-dimethylcyclopentenolone, corylone, guaiacol,
4-vinyl-2-methylphenol, vanillin, 2,6-dimethoxyphenol,
acetovanillone, syringaldehyde, acetosyringone, and combinations
thereof.
25. The tobacco product of claim 23, wherein the tobacco product is
a smoking article.
26. The tobacco product of claim 23, wherein the tobacco product is
a smokeless tobacco product.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to products made or derived
from tobacco, or that otherwise incorporate tobacco or components
of tobacco. Of particular interest are ingredients or components
obtained or derived from a plant of the Nicotiana species.
BACKGROUND OF THE INVENTION
[0002] Cigarettes, cigars and pipes are popular smoking articles
that employ tobacco in various forms. Such smoking articles are
used by heating or burning tobacco, and aerosol (e.g., smoke) is
inhaled by the smoker. Tobacco also may be enjoyed in a so-called
"smokeless" form. Particularly popular smokeless tobacco products
are employed by inserting some form of processed tobacco or
tobacco-containing formulation into the mouth of the user. More
recently, popular so-called "electronic cigarettes" employ
electrically generated heat to provide vapors incorporating tobacco
components for inhalation. See, for example, those types of tobacco
products and uses of processed tobaccos described in the background
art set forth in U.S. Pat. No. 7,503,330 to Borschke et al.; U.S.
Pat. No. 7,726,320 to Robinson et al. and U.S. Pat. No. 9,204,667
to Cantrell et al.; and U.S. Pat. Pub. No. 2015/0223522 to Ampolini
et al., which are incorporated herein by reference.
Tobacco-containing products incorporate various types of tobaccos
in various forms (e.g., as blended cut filler, as formed or
shredded reconstituted tobacco, as shredded strips or as tobacco
extracts).
[0003] A black liquor generally refers to a liquid product obtained
from a digesting treatment used in a pulp production process. Such
a product is a highly basic (e.g., pH>14) aqueous extract that
contains high levels of inorganic compounds used in the pulping
process including sodium hydroxide and sodium sulfite, as well as
lignin residues and hemicellulose from the biomass and many
breakdown products of both the hemicellulose and lignin. It has a
very characteristic strong odor of sulfur and alkali, and contains
high levels of dissolved organic and inorganic solids. As a result,
it has been used in flavoring applications. See, e.g., U.S. Pat.
Pub. No. 2015/0292152 to Hata et al., which is herein incorporated
by reference.
[0004] It would be desirable to provide processed tobaccos or
tobacco-derived materials that would have applications as
components of tobacco products. In particular, it would be
advantageous to develop methods of isolating flavorful compounds
for use in tobacco products from a black liquor produced by a
pulping process, specifically, by pulping a plant of the Nicotiana
species.
SUMMARY OF THE INVENTION
[0005] The present invention provides methods for isolating
compounds from a tobacco-derived black liquor, comprising receiving
a black liquor from a pulping process of an input material
comprising a plant of the Nicotiana species, treating the black
liquor with an acid to lower the pH of the black liquor to about 7
or lower in order to produce a precipitate and an acidified black
liquor, separating the precipitate and the acidified black liquor,
extracting the acidified black liquor with an organic solvent in
order to produce an organic layer extract and an aqueous layer
extract, and separating the organic layer extract and the aqueous
layer extract. In various embodiments, the organic solvent can have
a polarity of about 2.0 or greater. The organic solvent can
comprise methyl-t-butyl-ether, ethyl acetate, or a combination
thereof, for example. In various embodiments, the treating step can
comprise lowering the pH of the black liquor is lowered to about 4
or less. The acid used in the treating step can be hydrochloric
acid, sulfuric acid, or a combination thereof, for example.
[0006] In various embodiments, the method can further comprise
neutralizing the acidified black liquor to a pH of about 7 prior to
the step of extracting the acidified black liquor. In some
embodiments, the method can further comprise treating the organic
layer extract with a drying agent in order to remove excess water.
In certain embodiments, the organic layer extract can be
incorporated into a tobacco product. The tobacco product can be a
smoking article, for example. In certain embodiments, the tobacco
product can be a smokeless tobacco product.
[0007] In some embodiments, the methods of the present invention
can further comprise concentrating the organic layer extract by
evaporating the organic solvent in order to produce a concentrated
organic layer extract. The method can further comprise treating the
concentrated organic layer extract with a drying agent in order to
remove excess organic solvent.
[0008] In various embodiments, the concentrated organic layer can
be separated into multiple fractions, wherein each fraction
comprises at least one flavor compound. In certain embodiments, the
at least one flavor compound can be selected from the group
consisting of acetic acid, 3,5-dimethylcyclopentenolone, corylone,
guaiacol, 4-vinyl-2-methylphenol, vanillin, 2,6-dimethoxyphenol,
acetovanillone, syringaldehyde, acetosyringone, and combinations
thereof. The step of separating the concentrated organic layer
extract into multiple fractions can comprise chromatography
separation of the concentrated organic layer extract, for example.
In some embodiments, the step of separating the concentrated
organic layer extract into multiple fractions comprises
distillation of the concentrated organic layer extract. In various
embodiments of the present invention, the methods described herein
can further comprise incorporating at least one fraction into a
tobacco product. The tobacco product can be a smoking article, for
example. In certain embodiments, the tobacco product can be a
smokeless tobacco product.
[0009] In some embodiments, the method can further comprise
receiving a tobacco material comprising at least one of a stalk
material and a root material of a harvested plant of the Nicotiana
species, chemically pulping the tobacco material to form a
tobacco-derived pulp and the black liquor, and separating the
tobacco-derived pulp and the black liquor. The tobacco material can
comprise at least about 90 percent by dry weight of at least one of
the stalk material and the root material of the harvested plant of
the Nicotiana species, for example.
[0010] A tobacco product comprising a flavorant compound, the
flavorant compound being in the form of an organic extract of a
tobacco-derived black liquor is also provided herein. In various
embodiments, the flavor compound can be selected from the group
consisting of acetic acid, 3,5-dimethylcyclopentenolone, corylone,
guaiacol, 4-vinyl-2-methylphenol, vanillin, 2,6-dimethoxyphenol,
acetovanillone, syringaldehyde, acetosyringone, and combinations
thereof. In some embodiments, the tobacco product can be a smoking
article. In certain embodiments, the tobacco product can be a
smokeless tobacco product.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] In order to provide an understanding of embodiments of the
invention, reference is made to the appended drawings, which are
not necessarily drawn to scale, and in which reference numerals
refer to components of exemplary embodiments of the invention. The
drawings are exemplary only, and should not be construed as
limiting the invention.
[0012] FIG. 1 is a block diagram of a method for producing
flavorful compounds isolated from black liquor derived from a plant
of the Nicotiana species according to an example embodiment;
[0013] FIG. 2 is an exploded perspective view of a smoking article
having the form of a cigarette, showing the smokable material, the
wrapping material components, and the filter element of the
cigarette;
[0014] FIG. 3 is a top view of a smokeless tobacco product
embodiment, taken across the width of the product, showing an outer
pouch filled with a tobacco material; and
[0015] FIG. 4 is a sectional view through an electronic smoking
article comprising a cartridge and a control body and including a
reservoir housing according to an example embodiment of the present
disclosure.
DETAILED DESCRIPTION
[0016] The present invention now will be described more fully
hereinafter. This invention may, however, be embodied in many
different forms and should not be construed as limited to the
embodiments set forth herein; rather, these embodiments are
provided so that this disclosure will be thorough and complete, and
will fully convey the scope of the invention to those skilled in
the art. As used in this specification and the claims, the singular
forms "a," "an," and "the" include plural referents unless the
context clearly dictates otherwise. Reference to "dry weight
percent" or "dry weight basis" refers to weight on the basis of dry
ingredients (i.e., all ingredients except water).
[0017] The present invention provides methods of forming black
liquor derived from a harvested plant of the Nicotiana species, and
related products. As used herein, the term "tobacco-derived black
liquor" is understood to refer to a liquid byproduct from a tobacco
pulping process. In various embodiments, the cellulosic material
subjected to the tobacco pulping process predominantly includes
biomass derived from a plant of the Nicotiana species.
[0018] As described in more detail below, biomass derived from a
plant of the Nicotiana species can be subjected to a pulping
process which results in a cellulose pulp and a residual black
liquor. The resulting black liquor can be separated from the solid
material and then subjected to a liquid-liquid extraction to
produce a tobacco-derived, organic black liquor extract. Flavorful
compounds can be isolated from the black liquor extract, as
discussed in more detail below.
Tobacco Materials
[0019] The present disclosure is applicable, in some embodiments,
for large scale production, where the term large scale production
refers to processing large quantities of a biomass (e.g., tobacco)
on a mass production level. The term "biomass" and related terms
such as "biomatter" and "plant source" are understood to refer to
any portion of a harvested plant that may be processed to extract,
separate, or isolate components of interest therefrom. The
processing may be carried out in relation to various plants or
portions thereof, such as seeds, flowers, stalks, stems, roots,
tubers, leaves, or any further portions of the plant.
[0020] The selection of the plant from the Nicotiana species
utilized in the methods of the invention can vary; and in
particular, the types of tobacco or tobaccos can vary. The type of
tobacco used as the source of input material for each component
described herein can vary. Tobaccos that can be employed include
flue-cured or Virginia (e.g., K326), burley, sun-cured (e.g.,
Indian Kurnool and Oriental tobaccos, including Katerini, Prelip,
Komotini, Xanthi and Yambol tobaccos), Maryland, dark, dark-fired,
dark air cured (e.g., Passanda, Cubano, Jatin and Bezuki tobaccos),
light air cured (e.g., North Wisconsin and Galpao tobaccos), Indian
air cured, Red Russian and Rustica tobaccos, as well as various
other rare or specialty tobaccos. Descriptions of various types of
tobaccos, growing practices and harvesting practices are set forth
in Tobacco Production, Chemistry and Technology, Davis et al.
(Eds.) (1999), which is incorporated herein by reference. Various
representative types of plants from the Nicotiana species are set
forth in Goodspeed, The Genus Nicotiana, (Chonica Botanica) (1954);
U.S. Pat. No. 4,660,577 to Sensabaugh, Jr. et al.; U.S. Pat. No.
5,387,416 to White et al. and U.S. Pat. No. 7,025,066 to Lawson et
al.; US Patent Appl. Pub. Nos. 2006/0037623 to Lawrence, Jr. and
2008/0245377 to Marshall et al.; each of which is incorporated
herein by reference.
[0021] The particular Nicotiana species of material used in the
invention could also vary. Of particular interest are N. alata, N.
arentsii, N. excelsior, N. forgetiana, N. glauca, N. glutinosa, N.
gossei, N. kawakamii, N. knightiana, N. langsdorffi, N. otophora,
N. setchelli, N. sylvestris, N. tomentosa, N. tomentosiformis, N.
undulata, and N. x sanderae. Also of interest are N. africana, N.
amplexicaulis, N. benavidesii, N. bonariensis, N. debneyi, N.
longiflora, N. maritina, N. megalosiphon, N. occidentalis, N.
paniculata, N. plumbaginifolia, N. raimondii, N. rosulata, N.
rustica, N. simulans, N. stocktonii, N. suaveolens, N. tabacum, N.
umbratica, N. velutina, and N. wigandioides. Other plants from the
Nicotiana species include N. acaulis, N. acuminata, N. attenuata,
N. benthamiana, N. cavicola, N. clevelandii, N. cordifolia, N.
corymbosa, N. fragrans, N. goodspeedii, N. linearis, N. miersii, N.
nudicaulis, N. obtusifolia, N. occidentalis subsp. Hersperis, N.
pauciflora, N. petunioides, N. quadrivalvis, N. repanda, N.
rotundifolia, N. solanifolia and N. spegazzinii. The Nicotiana
species can be derived using genetic-modification or crossbreeding
techniques (e.g., tobacco plants can be genetically engineered or
crossbred to increase or decrease production of certain components
or to otherwise change certain characteristics or attributes). See,
for example, the types of genetic modifications of plants set forth
in U.S. Pat. No. 5,539,093 to Fitzmaurice et al.; U.S. Pat. No.
5,668,295 to Wahab et al.; U.S. Pat. No. 5,705,624 to Fitzmaurice
et al.; U.S. Pat. No. 5,844,119 to Weigl; U.S. Pat. No. 6,730,832
to Dominguez et al.; U.S. Pat. No. 7,173,170 to Liu et al.; U.S.
Pat. No. 7,208,659 to Colliver et al.; and U.S. Pat. No. 7,230,160
to Benning et al.; US Patent Appl. Pub. No. 2006/0236434 to
Conkling et al.; and PCT WO 2008/103935 to Nielsen et al.
[0022] The portion or portions of the plant of the Nicotiana
species used according to the present invention can vary. For
example, virtually all of the plant (e.g., the whole plant) can be
harvested, and employed as such. Alternatively, various parts or
pieces of the plant can be harvested or separated for further use
after harvest. For example, the leaves, stem, stalk, roots, lamina,
flowers, seed, and various portions and combinations thereof, can
be isolated for further use or treatment. The plant material of the
invention may thus comprise an entire plant or any portion of a
plant of the Nicotiana species. See, for example, the portions of
tobacco plants set forth in US Pat. Appl. Pub. Nos. 2011/0174323 to
Coleman, III et al. and 2012/0192880 to Dube et al., which are
incorporated by reference herein.
[0023] The plant component or components from the Nicotiana species
can be employed in an immature form. That is, the plant can be
harvested before the plant reaches a stage normally regarded as
ripe or mature. As such, for example, the plant can be harvested
when the tobacco plant is at the point of a sprout, is commencing
leaf formation, is commencing flowering, or the like.
[0024] The plant components from the Nicotiana species can be
employed in a mature form. That is, the plant can be harvested when
that plant reaches a point that is traditionally viewed as being
ripe, over-ripe or mature. As such, for example, through the use of
tobacco harvesting techniques conventionally employed by farmers,
Oriental tobacco plants can be harvested, burley tobacco plants can
be harvested, or Virginia tobacco leaves can be harvested or primed
by stalk position.
[0025] After harvest, the plant of the Nicotiana species, or
portion thereof, can be used in a green form (e.g., tobacco can be
used without being subjected to any curing process). In various
embodiments, the tobacco material can be subjected to various
treatment processes such as, refrigeration, freezing, drying (e.g.,
freeze-drying or spray-drying), irradiation, yellowing, heating,
cooking (e.g., roasting, frying or boiling), fermentation,
bleaching or otherwise subjected to storage or treatment for later
use. In some embodiments, harvested tobacco can be sprayed with a
buffer or antioxidant (e.g., a sodium metabisulfite buffer) to
prevent the green plants from browning prior to further treatment
as described herein. Other exemplary processing techniques are
described, for example, in US Pat. Appl. Pub. Nos. 2009/0025739 to
Brinkley et al. and 2011/0174323 to Coleman, III et al., which are
incorporated by reference herein. At least a portion of the plant
of the Nicotiana species can be treated with enzymes and/or
probiotics before or after harvest, as discussed in US Pat. Appl.
Pub. Nos. 2013/0269719 to Marshall et al., and 2014/0020694 to
Moldoveanu, which are incorporated herein by reference.
[0026] A harvested portion or portions of the plant of the
Nicotiana species can be physically processed. A portion or
portions of the plant can be separated into individual parts or
pieces (e.g., roots can be removed from stalks, stems can be
removed from stalks, leaves can be removed from stalks and/or
stems, petals can be removed from the remaining portion of the
flower). Although any single part of the tobacco plant or multiple
parts of the tobacco plant can be used according to the present
invention, preferably tobacco root, tobacco stalk, tobacco leaves,
or a combination thereof are used. The harvested portion or
portions of the plant can be further subdivided into parts or
pieces (e.g., shredded, cut, comminuted, pulverized, milled or
ground into pieces or parts that can be characterized as
filler-type pieces, granules, particulates or fine powders). The
harvested portion or portions of the plant can be subjected to
external forces or pressure (e.g., by being pressed or subjected to
roll treatment). For example, in certain embodiments, tobacco
stalk, either alone or in combination with other portions of the
plant (e.g., stalk and leaf together) can be used and may, in some
embodiments, be subjected to the types of treatment described in US
Pat. Appl. Publ. No. 2012/0152265 to Dube et al., which is
incorporated herein by reference.
[0027] In certain embodiments, the tobacco material can be treated
with water to extract an aqueous soluble component of the tobacco
material therefrom. In some preferred embodiments, the particulate
or powder tobacco material can be combined with water to form a
moist aqueous material (e.g., in the form of a suspension or
slurry) and the resulting material is typically heated to
effectuate extraction of various compounds. The water used to form
the moist material can be pure water (e.g., tap water or deionized
water) or a mixture of water with suitable co-solvents such as
certain alcohols. In certain embodiments, the amount of water added
to form the moist material can be at least about 50 weight percent,
or at least about 60 weight percent, or at least about 70 weight
percent, based on the total weight of the moist material. In some
cases, the amount of water can be described as at least about 80
weight percent or at least about 90 weight percent.
[0028] The extract thus produced may comprise some level of solid
(insoluble) material entrained in the liquid. Accordingly, in this
context, "extract" is intended to mean the material obtained upon
contacting the tobacco material with water and may comprise both
soluble components dissolved therein and solid dispersed
components. Following the extraction process, the extracted liquid
component is typically filtered to remove at least some of the
solids. In other words, some or all of the portion of the tobacco
material insoluble in the aqueous solvent is removed. The process
of filtration can comprise passing the liquid through one or more
filter screens to remove selected sizes of particulate matter.
Screens may be, for example, stationary, vibrating, rotary, or any
combination thereof. Filters may be, for example, press filters or
pressure filters. In some embodiments, the filtration method used
can involve microfiltration, ultrafiltration, and/or
nanofiltration. A filter aid can be employed to provide effective
filtration and can comprise any material typically used for this
purpose. For example, some common filter aids include cellulose
fibers, perlite, bentonite, diatomaceous earth, and other silaceous
materials. To remove solid components, alternative methods can also
be used, for example, centrifugation or settling/sedimentation of
the components and siphoning off of the liquid. See, for example,
the processes and products described in U.S. Pat. App. Pub. Nos.
2012/0152265 to Dube et al. and 2012/0192880 to Dube et al., herein
incorporated by reference in their entireties. The extracted solid
components can be used as the starting tobacco material in various
embodiments of the invention described herein.
[0029] Further, in some embodiments the tobacco input can comprise
reconstituted tobacco. Typically, tobacco stems are used in making
such a reconstituted tobacco sheet, because the fibrous nature of
those stems provides strength and structural integrity to the
resulting sheet. See, for example, U.S. Pat. No. 3,398,754 to
Tughan; U.S. Pat. No. 3,847,164 to Mattina; U.S. Pat. No. 4,131,117
to Kite; U.S. Pat. No. 4,182,349 to Selke; U.S. Pat. No. 4,270,552
to Jenkins; U.S. Pat. No. 4,308,877 to Mattina; U.S. Pat. No.
4,341,228 to Keritsis; U.S. Pat. No. 4,421,126 to Gellatly; U.S.
Pat. No. 4,706,692 to Gellatly; U.S. Pat. No. 4,962,774 to
Thomasson; U.S. Pat. No. 4,941,484 to Clapp; U.S. Pat. No.
4,987,906 to Young; U.S. Pat. No. 5,056,537 to Brown; U.S. Pat. No.
5,143,097 to Sohn; U.S. Pat. No. 5,159,942 to Brinkley et al.; U.S.
Pat. No. 5,325,877 to Young; U.S. Pat. No. 5,445,169 to Brinkley;
U.S. Pat. No. 5,501,237 to Young; and U.S. Pat. No. 5,533,530 to
Young, which are incorporated herein by reference.
Cellulosic Pulp and Residual Black Liquor Derived from Tobacco
Materials
[0030] According to the present invention, black liquor can be
derived from a tobacco pulping process. As illustrated at operation
100 of FIG. 1, for example, preparation of a tobacco-derived black
liquor according to the present invention can comprise providing a
biomass derived from a plant of the Nicotiana species. Providing
the tobacco biomass can include harvesting a plant from the
Nicotiana species and, in certain embodiments, separating certain
components from the plant such as the stalks and/or roots, and
physically processing these components. Although whole tobacco
plants or any component thereof (e.g., leaves, flowers, stems,
roots, stalks, and the like) could be used in the invention, it can
be advantageous to use stalks and/or roots of the tobacco plant.
For example, in certain embodiments, the tobacco material input
comprises at least about 90%, at least about 92%, at least about
95%, or at least about 97% by dry weight of at least one of the
stalk material and the root material of a harvested plant of the
Nicotiana species. The remainder of the description related to
cellulosic pulp and black liquor derived from tobacco material
focuses on use of stalks and/or roots from the plant, but the
invention is not limited to such embodiments.
[0031] The tobacco stalks and/or roots can be separated into
individual pieces (e.g., roots separated from stalks, and/or root
parts separated from each other, such as big root, mid root, and
small root parts) or the stalks and roots may be combined. By
"stalk" is meant the stalk that is left after the leaf (including
stem and lamina) has been removed. "Root" and various specific root
parts useful according to the present invention may be defined and
classified as described, for example, in Mauseth, Botany: An
Introduction to Plant Biology: Fourth Edition, Jones and Bartlett
Publishers (2009) and Glimn-Lacy et al., Botany Illustrated, Second
Edition, Springer (2006), which are incorporated herein by
reference. The harvested stalks and/or roots are typically cleaned,
ground, and dried to produce a material that can be described as
particulate (i.e., shredded, pulverized, ground, granulated, or
powdered). As used herein, stalks and/or roots can also refer to
stalks and/or roots that have undergone an extraction process to
remove water soluble materials. The cellulosic material (i.e.,
pulp) remaining after stalks and/or root materials undergo an
extraction process can also be useful in the present invention.
[0032] The roots and stalks of a tobacco plant have a higher weight
percentage of cellulosic content than tobacco stems. As a result,
the roots and stalks of a tobacco plant have a higher cellulosic
pulp yield potential than tobacco stems. Additionally, tobacco
stems represent a valuable starting material for the preparation of
tobacco reconstituted sheet and expanded stem materials used in
tobacco products. Use of tobacco stems as a source for cellulosic
pulp and black liquor would decrease the supply of tobacco stems
that can be used in other tobacco manufacturing processes. Tobacco
stalks and roots represent a tobacco material not otherwise used in
tobacco manufacturing and as such, represent an excellent raw
material for the preparation of tobacco-derived black liquor. An
additional tobacco raw material that is otherwise not used in
tobacco manufacturing is so-called tobacco dust (i.e., a very small
particle tobacco material collected during cigarette manufacturing)
and so-called stemmery dust (i.e., a tobacco-derived material
collected during the stemming of the tobacco leaves). Tobacco dust
and stemmery dust can also be used to produce a cellulosic
sugar.
[0033] Preferably, the physical processing step comprises
comminuting, grinding, and/or pulverizing stalks and/or roots from
a Nicotiana plant into particulate form using equipment and
techniques for grinding, milling, or the like. In certain preferred
embodiments, the stalks and/or roots are dried prior to the
physical processing step, and thus are relatively dry in form
during grinding or milling. For example, the stalks and/or roots
can be ground or milled when the moisture content thereof is less
than about 15 weight percent or less than about 5 weight percent.
In such embodiments, equipment such as hammer mills, cutter heads,
air control mills, or the like may be used.
[0034] The tobacco material provided following the comminuting,
grinding, and/or pulverizing of Nicotiana stalks and/or roots can
have any size. The tobacco material can be such that parts or
pieces thereof have an average width and/or length between about
1/16 inch to about 2 inches, about 1/4 inch to about 1 inch, or
about 1/4 inch to about 1/2 inch. In some embodiments, the average
width and/or length of the tobacco material is greater than or
equal to about 1/8 inches, greater than or equal to about 1/4 inch,
greater than or equal to about 1/2 inch, greater than or equal to
about 1 inch, or greater than or equal to about 2 inches.
[0035] The exact composition of the tobacco material used to
produce black liquor can vary. The composition may depend, in part,
on whether the tobacco material is prepared from Nicotiana stalks,
roots, or a combination thereof. Tobacco material prepared solely
from material obtained from Nicotiana stalks may exhibit different
characteristics than tobacco material prepared solely from material
obtained from Nicotiana roots. Similarly, tobacco material prepared
from material obtained from certain parts of one of these
components may exhibit different characteristics than material
obtained from other parts of this component (e.g., tobacco material
prepared from mid-root material may be different from tobacco
material prepared from big root material). For example, in certain
embodiments, tobacco material derived from Nicotiana stalk has a
higher content of volatile compounds than tobacco material derived
from Nicotiana root.
[0036] In various embodiments of the present invention, the tobacco
material can be converted into a cellulose material and a residual
black liquor through a delignification of the tobacco material, for
example. Delignification of tobacco materials can involve a number
of operations. See, e.g., U.S. patent application Ser. No.
14/599,258 to Byrd Jr. et al., filed Jan. 16, 2015, which is herein
incorporated by reference in its entirety. As an initial step,
tobacco biomass can undergo a pulping process. Pulps can be
produced from raw materials either mechanically or chemically, as
illustrated at operation 102 in FIG. 1, for example.
[0037] In a mechanical pulping process, raw tobacco materials can
be chipped, and then fed between refiners where the chips are made
into fibers between revolving metal disks, for example. Mechanical
pulping does not separate the lignin from cellulose fibers, so the
yield is often relatively high (i.e., above 95%).
[0038] In some embodiments, a chemical pulping process can be used
in the methods described herein. A chemical pulping process
separates lignin from cellulose fibers by dissolving lignin in a
cooking liquor such that the lignin, which binds the cellulose
fibers together, can be washed away from the cellulose fibers
without seriously degrading the cellulose fibers. There are three
main chemical pulping processes known in the art. Soda pulping
involves cooking raw material chips in a sodium hydroxide cooking
liquor. The Kraft process evolved from soda pulping and involves
cooking raw material chips in a solution of sodium hydroxide and
sodium sulfide. The acidic sulfite process involves using sulfurous
acid and bisulfate ion in the cook. Any chemical pulping process
known in the art, including, but not limited to the three examples
listed above, can be used to produce a tobacco pulp and residual
black liquor from raw tobacco materials.
[0039] A cooking liquor can comprise a strong base. As used herein,
a strong base refers to a basic chemical compound (or combination
of such compounds) that is able to deprotonate very weak acids in
an acid-base reaction. For example, strong bases that can be useful
in the present invention include, but are not limited to one or
more of sodium hydroxide, potassium hydroxide, sodium carbonate,
sodium bicarbonate, potassium carbonate, potassium bicarbonate,
ammonium hydroxide, ammonium bicarbonate, and ammonium carbonate.
In some embodiments, the weight of the strong base can be greater
than about 5%, greater than about 25%, or greater than about 40% of
the weight of the tobacco input. In certain embodiments, the weight
of the strong base can be less than about 60% or less than about
50% of the weight of the tobacco input. In still further
embodiments, the weight of the strong base can be from about 5% to
about 50%, or from about 30% to about 40% of the weight of the
tobacco input. Various other chemicals and weight ratios thereof
can also be employed to chemically pulp the tobacco input in other
embodiments.
[0040] In addition to combining a tobacco input with a strong base,
chemically pulping a tobacco input can include heating the tobacco
input and the strong base. Heating the tobacco input and the strong
base can be conducted to increase the efficacy of the chemical
pulping. In this regard, an increase in either cooking temperature
or time will result in an increased reaction rate (rate of lignin
removal).
[0041] For example, a method of producing tobacco-derived black
liquor can comprise soda pulping a tobacco input to form a tobacco
pulp and black liquor. Raw tobacco materials can be cooked with a
20-40% NaOH solution. The ratio of cooking liquor to stems can be,
for example, from about 6:1 to about 8:1. This mixture can be
heated to a maximum temperature of about 150.degree. C. to about
175.degree. C. in approximately 60-90 minutes and cooked at the
maximum temperature for about 40 minutes to about 180 minutes, for
example.
[0042] In some embodiments, a method of producing tobacco-derived
black liquor can comprise Kraft pulping a tobacco input to form a
tobacco pulp and black liquor. Raw tobacco materials can be cooked
with a liquor comprising about 15-25% Na.sub.2O and about 20-30%
sulfidity. The ratio of cooking liquor to stems can be, for
example, from about 8:1 to about 10:1. This mixture can be heated
to a maximum temperature of about 160.degree. C. to about
180.degree. C. at approximately 60-150 minutes and cooked at the
maximum temperature for about 110 to about 150 minutes, for
example. The resulting pulps can have about a 42-45% yield, for
example.
[0043] In some embodiments, the tobacco-derived pulp can optionally
undergo a de-lignification process (e.g., an acid or a base can be
used to hydrolyze the tobacco-derived pulp and separate the
lignin). In addition, the pulp can be rinsed with water and
dewatered at least once. The pulp can be dewatered by wet
classification, centrifugation, filtration, or similar liquid
separation processes. A centrifuge or other similar equipment can
help with pulp and black liquor syrup (i.e., solids and liquid)
separations. See, e.g., the equipment disclosed in U.S. Pat. Nos.
521,104 to Davis, U.S. Pat. No. 3,168,474 to Stallman et al., U.S.
Pat. No. 5,713,826 to West, and U.S. Pat. No. 7,060,017 to Collier,
each of which is herein incorporated by reference in its entirety.
For example, a basket centrifuge can be useful to help with the
pulp dewatering and black liquor recovery activities.
[0044] In some embodiments, the pulping process can further include
bleaching the tobacco-derived pulp. The bleaching operation can be
conducted to remove the residual non-cellulosic materials left over
after pulping without damaging the cellulose. Exemplary processes
for treating tobacco with bleaching agents are discussed, for
example, in U.S. Pat. No. 787,611 to Daniels, Jr.; U.S. Pat. No.
1,086,306 to Oelenheinz; U.S. Pat. No. 1,437,095 to Delling; U.S.
Pat. No. 1,757,477 to Rosenhoch; U.S. Pat. No. 2,122,421 to
Hawkinson; U.S. Pat. No. 2,148,147 to Baier; U.S. Pat. No.
2,170,107 to Baier; U.S. Pat. No. 2,274,649 to Baier; U.S. Pat. No.
2,770,239 to Prats et al.; U.S. Pat. No. 3,612,065 to Rosen; U.S.
Pat. No. 3,851,653 to Rosen; U.S. Pat. No. 3,889,689 to Rosen; U.S.
Pat. No. 4,143,666 to Rainer; U.S. Pat. No. 4,194,514 to Campbell;
U.S. Pat. No. 4,366,824 to Rainer et al.; U.S. Pat. No. 4,388,933
to Rainer et al.; and U.S. Pat. No. 4,641,667 to Schmekel et al.;
and PCT WO 96/31255 to Giolvas, all of which are incorporated by
reference herein.
[0045] In some embodiments, the method of producing a
tobacco-derived cellulose material and black liquor can include one
or more additional operations. See, e.g., U.S. Patent Appl. Pub.
No. 2013/0276801 to Byrd Jr. et al., herein incorporated by
reference in its entirety. For example, the tobacco input can
undergo further processing steps prior to pulping and/or the
delignification method can include additional treatment steps
(e.g., drying the tobacco input, depithing the tobacco input,
milling the tobacco input, etc.). In some embodiments, these
additional steps can be conducted to remove pith from the tobacco
input and/or tobacco pulp manually, and thus reduce the amount of
chemicals necessary to delignify the tobacco input during a
chemical pulping process, for example. Mixing water with the
tobacco pulp to form a slurry and filtering the slurry can be
conducted, for example, to remove some of the non-cellulosic
materials, such as pith, parenchyma, and tissue from the tobacco
pulp. Additional treatment steps (e.g., milling the tobacco input)
can be conducted to increase the surface area of the tobacco input
such that the efficacy of a pulping and/or a bleaching operation is
increased. Steam- or water-based pre-hydrolysis of the tobacco
stalk prior to pulping, for example, can reduce the amount of
chemicals necessary in a bleaching operation. Anthraquinone can be
employed in a chemical pulping method in an attempt to provide a
higher yield by protecting carbohydrates from the strong base
during delignification, for example. Other processing steps known
in the pulping and delignification field can be employed in forming
cellulosic materials from the raw tobacco input.
Black Liquor Extraction
[0046] According to the present invention, black liquor can be
obtained as a byproduct of pulping biomass derived from a plant of
the Nicotiana species and can be a source of valuable flavor
compounds. Tobacco-derived black liquor can be rich in lignin
depolymerization products such as 2,6-dimethyoxyphenol, guaiacol,
vanillin, acetovanillone, syringaldehyde, and acetosyringone, for
example. These flavor compounds can be isolated from
tobacco-derived black liquor, as discussed in more detail
below.
[0047] As discussed above, tobacco materials can undergo a pulping
process to produce a tobacco derived fibrous material (i.e., pulp)
and a residual liquid (i.e., black liquor). In various embodiments,
and as illustrated at operation 104 of FIG. 1, the tobacco-derived
black liquor can be separated from the cellulosic pulp through
centrifugation, filtration (e.g., use of a filter cloth), or other
means of liquid/solid separation. A centrifuge or other similar
equipment can help with solids and liquid separations. See, e.g.,
the equipment disclosed in U.S. Pat. Nos. 521,104 to Davis, U.S.
Pat. No. 3,168,474 to Stallman et al., U.S. Pat. No. 5,713,826 to
West, and U.S. Pat. No. 7,060,017 to Collier, each of which is
herein incorporated by reference in its entirety.
[0048] After separating the tobacco-derived black liquor from the
cellulosic pulp, the black liquor is often basic as a result of
chemicals used during the pulping process. As illustrated at
operation 106 of FIG. 1, for example, the pH of the black liquor
can be adjusted below 7. At pH greater than 8.5, the alkaloids are
in the free state and therefore are easily removed by organic
solvent extraction (discussed in more detail below), whereas the
phenols are apparently complexed or in the form of salts at the
high pH. On the contrary, at pH of 7 or lower, the alkaloids are
present in the salt form and the phenolics are not such that the
organic extracts are dominated by the phenolic compounds with an
absence of alkaloids. As such, adjusting the pH of the black liquor
below 7 can help avoid concentration of nicotine in the black
liquor by generating a nicotine salt that can then be separated
from the acidified black liquor. For example, the pH of the black
liquor can be adjusted to a pH in the range of about 2 to 7, about
3 to 6, or about 3 to 4. In some embodiments, sulfuric acid,
hydrochloric acid, or combinations thereof can be used to acidify
the black liquor. However, any acid known in the art can be used to
acidify the black liquor.
[0049] In various embodiments, as illustrated at operation 108 of
FIG. 1, the acidified black liquor can undergo a filtration or
separation process to remove any lignin salts from the acidified
black liquor and thereby form a purified black liquor. For example,
the acidified black liquor can be separated from any precipitate
(i.e., salts) generated after adding an acid to the tobacco-derived
black liquor through centrifugation, filtration (e.g., use of a
filter cloth), or other means of liquid/solid separation. A
centrifuge or other similar equipment can help with solids and
liquid separations. See, e.g., the equipment disclosed in U.S. Pat.
Nos. 521,104 to Davis, U.S. Pat. No. 3,168,474 to Stallman et al.,
U.S. Pat. No. 5,713,826 to West, and U.S. Pat. No. 7,060,017 to
Collier, each of which is herein incorporated by reference in its
entirety.
[0050] In certain embodiments, the acidification of the
tobacco-derived black liquor can be achieved in multiple steps. As
such, an acid can be added to the tobacco-derived black liquor to
adjust the tobacco-derived black liquor to a first pH value.
Optionally, the first acid addition can be followed by a separation
step, as described above. Additional acid can be added to the
tobacco-derived black liquor in a second phase to adjust the
tobacco-derived black liquor to a second pH value. This process can
be repeated as necessary until the desired pH is reached. In
various embodiments, multiple separations can be performed during
acidification of the tobacco-derived black liquor.
[0051] Following removal of any salts from the acidified black
liquor, the pH of the purified black liquor can be neutralized, as
illustrated at operation 110 of FIG. 1, for example. In various
embodiments, the pH of the purified black liquor can be adjusted to
a pH range of about 6 to 8, or about 6.5 to 7.5. The pH of the
purified black liquor can be neutralized using any pH adjuster
and/or buffer known in the art.
[0052] In various embodiments of the present invention, the
purified black liquor can undergo an organic extraction process, as
illustrated at operation 114 in FIG. 1, for example. In certain
embodiments, the solvent used in the organic extraction can be
polar aprotic. In various embodiments, the solvent can have a
polarity of about 2.0 or greater, about 2.3 or greater, or about
2.5 or greater. In a preferred embodiment, the solvent is not
miscible with water. For example, the solvent used in the organic
extraction of the acidified black liquor can comprise ethers, ethyl
acetate, hexanes, and combinations thereof. In a preferred
embodiment, the purified black liquor can be subjected to
sequential liquid-liquid extractions with a solvent comprising
methyl-t-butyl-ether (MTBE), ethyl acetate (EtOAc), or combinations
thereof. The one or more liquid-liquid extractions of the purified
black liquor can be used to isolate organic compounds in the
organic layer of the extracted black liquor.
[0053] Attempts to extract black liquor with organic solvents can
result in emulsions which are extremely difficult to separate. Once
separated, the organic layers can contain a large amount of water
that requires drying prior to concentration. As such, in certain
embodiments, the purified black liquor can be subjected to a
pre-filtration step before organic solvent extraction. The purified
black liquor can be pre-filtered using filters known in the art, as
illustrated at operation 112 of FIG. 1, for example. For example,
the purified black liquor can be subjected to nano filtration
and/or filtration to isolate organic molecules of a certain size
(e.g., filtered using 1 KDa and 2 KDa Sartorius.RTM. filters).
[0054] As illustrated at operation 116 in FIG. 1, for example,
following the organic extraction of the purified black liquor, the
organic layer can be isolated (i.e., separated from an aqueous
layer) with a separatory funnel, or any means of liquid/liquid
separation known in the art. The separated aqueous layer of the
extracted black liquor can optionally undergo at least one
additional liquid-liquid extraction. As illustrated at operation
120 in FIG. 1, for example, the isolated organic layer can
subsequently undergo a drying process to form a concentrated
organic layer. For example, the isolated organic layer can be dried
with rotary evaporation, turbo evaporation, and/or any drying means
known in the art until all the solvent is removed. The concentrated
organic black liquor extract can be incorporated into various
tobacco products, for example. In some embodiments, the
concentrated organic extracts can be used as tobacco-derived
flavorants in the form of a blending agent for a flavorant and/or
as a top dressing for a tobacco product, for example.
[0055] As illustrated at operation 118 in FIG. 1, for example, a
drying agent can optionally be added to the separated organic layer
to help remove any excess water. In various embodiments, the drying
agent can include carbon, calcium chloride (CaCl.sub.2), sodium
sulfate (Na.sub.2SO.sub.4) calcium sulfate (CaSO.sub.4, also known
as Drierite), magnesium sulfate (MgSO.sub.4), and combinations
thereof. In various embodiments, the drying agent can be added to
the separated black liquor organic layer either before and/or after
the organic layer is concentrated (e.g., undergoes a rotary
evaporation process or other means for removing water known in the
art).
[0056] In some embodiments, as illustrated at operation 122 of FIG.
1, for example, the concentrated organic extracts can undergo
further purification. For example, the extracts can undergo
chromatography separation, distillation, or any other means known
in the art to isolate separate compounds within the concentrated
organic extract. In various embodiments of the present invention,
the concentrated organic extracts can comprise at least one of
acetic acid, 3,5-dimethylcyclopentenolone, corylone, nicotine,
guaiacol, 4-vinyl-2-methylphenol, vanillin, 2,6-dimethoxyphenol,
acetovanillone, syringaldehyde, and acetosyringone. As discussed in
more detail below, the isolated compounds can be incorporated into
various tobacco products, for example.
[0057] Chromatography is a physical method of separation that
distributes components to separate between two phases, a stationary
phase and a mobile phase. In various embodiments of the present
invention, column chromatography using a silica gel bead can be
used to isolate compounds within the concentrated organic extract.
The concentrated extracts can be loaded on top of a silica gel
column and eluted with mixtures of hexane and ethyl acetate, for
example. In certain embodiments, an initial solvent mixture (e.g.,
about 75% hexane and about 25% ethyl acetate by volume) can be used
to slurry up the silica gel for pouring into the column. Once the
column is loaded, solvent can be fed to the column which has been
pressurized to a steady state. The column eluent can then be
collected. The eluent fractions contain different compounds of
interest, as described above. The fractions can be concentrated to
remove the solvent (e.g., hexane and/or ethyl acetate).
Uses of Tobacco-Derived Black Liquor in Tobacco Products
[0058] Organic compounds derived from black liquor generated
according to the present invention can be useful as components
(e.g., flavorants) incorporated into tobacco products, for example.
The tobacco product to which the materials of the invention are
added can vary, and can include any product configured or adapted
to deliver tobacco or some component thereof to the user of the
product. Exemplary tobacco products include smoking articles (e.g.,
cigarettes), smokeless tobacco products, and aerosol-generating
devices that contain a tobacco material or other plant material
that is not combusted during use.
[0059] In various embodiments of the present invention,
tobacco-derived organic extracts can be incorporated into smoking
articles in the form of a flavorant or a component of a flavorant
in a tobacco composition and/or in a filter element of a smoking
article. For example, tobacco-derived organic extracts can be
incorporated into a top dressing or casing of a tobacco product.
Referring to FIG. 2, there is shown a smoking article 10 in the
form of a cigarette and possessing certain representative
components of a smoking article that can contain products derived
from the cellulosic sugar materials of the present invention. The
cigarette 10 includes a generally cylindrical rod 12 of a charge or
roll of smokable filler material (e.g., about 0.3 to about 1.0 g of
smokable filler material such as tobacco material) contained in a
circumscribing wrapping material 16. The rod 12 is conventionally
referred to as a "tobacco rod." The ends of the tobacco rod 12 are
open to expose the smokable filler material. The cigarette 10 is
shown as having one optional band 22 (e.g., a printed coating
including a film-forming agent, such as starch, ethylcellulose, or
sodium alginate) applied to the wrapping material 16, and that band
circumscribes the cigarette rod in a direction transverse to the
longitudinal axis of the cigarette. The band 22 can be printed on
the inner surface of the wrapping material (i.e., facing the
smokable filler material), or less preferably, on the outer surface
of the wrapping material.
[0060] At one end of the tobacco rod 12 is the lighting end 18, and
at the mouth end 20 is positioned a filter element 26. The filter
element 26 positioned adjacent one end of the tobacco rod 12 such
that the filter element and tobacco rod are axially aligned in an
end-to-end relationship, preferably abutting one another. Filter
element 26 may have a generally cylindrical shape, and the diameter
thereof may be essentially equal to the diameter of the tobacco
rod. The ends of the filter element 26 permit the passage of air
and smoke therethrough. A plug wrap 28 enwraps the filter element
and a tipping material (not shown) enwraps the plug wrap and a
portion of the outer wrapping material 16 of the rod 12, thereby
securing the rod to the filter element 26.
[0061] The filter element of the invention typically comprises
multiple longitudinally extending segments. Each segment can have
varying properties and may include various materials capable of
filtration or adsorption of particulate matter and/or vapor phase
compounds. Typically, the filter element of the invention includes
2 to 6 segments, frequently 2 to 4 segments. In one preferred
embodiment, the filter element includes a mouth end segment, a
tobacco end segment and a compartment therebetween. This filter
arrangement is sometimes referred to as a "compartment filter" or a
"plug/space/plug" filter. The compartment may be divided into two
or more compartments as described in greater detail below.
[0062] In various embodiments, the filter element can comprise an
adsorbent in the form of an activated carbon material, wherein the
activated carbon is capable of removing at least one gas phase
component of mainstream smoke is incorporated into the filter
element. In certain embodiments, the filter element 26 can include
ventilation holes 30 that extend through the tipping paper (not
shown) and the plug wrap 28 and, thus, provide air dilution of
mainstream smoke. The ventilation holes 30 may be configured as a
single line of perforations extending circumferentially around the
filter element 26 or may comprise several lines of perforations. As
would be understood, the exact count and size of the ventilation
holes 30 will vary depending on the desired level of air
dilution.
[0063] In various embodiments of the present invention, at least
one tobacco-derived flavor compound and/or organic extract isolated
from tobacco-derived black liquor can be incorporated into
smokeless tobacco products in the form of a flavorant or a
component of a flavorant in a smokeless tobacco formulation. The
form of the smokeless tobacco product of the invention can vary. In
one particular embodiment, the product is in the form of a
snus-type product containing a particulate tobacco material and a
flavorant comprising at least one compound isolated from
tobacco-derived black liquor. Manners and methods for formulating
snus-type tobacco formulations will be apparent to those skilled in
the art of snus tobacco product production. For example, as
illustrated in FIG. 3, an exemplary pouched product 300 can
comprise an outer water-permeable container 320 in the form of a
pouch which contains a particulate mixture 315 adapted for oral
use. The orientation, size, and type of outer water-permeable pouch
and the type and nature of the composition adapted for oral use
that are illustrated herein are not construed as limiting
thereof.
[0064] In various embodiments, a moisture-permeable packet or pouch
can act as a container for use of the composition within. The
composition/construction of such packets or pouches, such as the
container pouch 320 in the embodiment illustrated in FIG. 3, may be
varied as noted herein. For example, suitable packets, pouches or
containers of the type used for the manufacture of smokeless
tobacco products, which can be modified according to the present
invention, are available under the tradenames CatchDry, Ettan,
General, Granit, Goteborgs Rape, Grovsnus White, Metropol Kaktus,
Mocca Anis, Mocca Mint, Mocca Wintergreen, Kicks, Probe, Prince,
Skruf and TreAnkrare. A pouch type of product similar in shape and
form to various embodiments of a pouched product described herein
is commercially available as ZONNIC (distributed by Niconovum AB).
Additionally, pouch type products generally similar in shape and
form to various embodiments of a pouched product are set forth as
snuff bag compositions E-J in Example 1 of PCT WO 2007/104573 to
Axelsson et al., which is incorporated herein by reference, which
are produced using excipient ingredients and processing conditions
that can be used to manufacture pouched products as described
herein.
[0065] The amount of material contained within each pouch may vary.
In smaller embodiments, the dry weight of the material within each
pouch is at least about 50 mg to about 150 mg. For a larger
embodiment, the dry weight of the material within each pouch
preferably does not exceed about 300 mg to about 500 mg.
[0066] In some embodiments, each pouch/container can have disposed
therein a flavor agent member, as described in greater detail in
U.S. Pat. No. 7,861,728 to Holton, Jr. et al., which is
incorporated herein by reference. The flavor agent member can
comprise a flavorant comprising at least one organic compound
and/or concentrated organic extract isolated from black liquor
derived from tobacco materials, as discussed above. If desired,
other components can be contained within each pouch. For example,
at least one flavored strip, piece or sheet of flavored water
dispersible or water soluble material (e.g., a breath-freshening
edible film type of material) may be disposed within each pouch
along with or without at least one capsule. Such strips or sheets
may be folded or crumpled in order to be readily incorporated
within the pouch. See, for example, the types of materials and
technologies set forth in U.S. Pat. No. 6,887,307 to Scott et al.
and U.S. Pat. No. 6,923,981 to Leung et al.; and The EFSA Journal
(2004) 85, 1-32; which are incorporated herein by reference.
[0067] In various embodiments, the outer water-permeable pouch can
comprise PLA or other pouch materials known in the art.
Descriptions of various components of snus types of products and
components thereof also are set forth in US Pat. App. Pub. No.
2004/0118422 to Lundin et al., which is incorporated herein by
reference. See, also, for example, U.S. Pat. No. 4,607,479 to
Linden; U.S. Pat. No. 4,631,899 to Nielsen; U.S. Pat. No. 5,346,734
to Wydick et al.; and U.S. Pat. No. 6,162,516 to Derr, and US Pat.
Pub. No. 2005/0061339 to Hansson et al.; each of which is
incorporated herein by reference. See, also, the types of pouches
set forth in U.S. Pat. No. 5,167,244 to Kjerstad, which is
incorporated herein by reference. Snus types of products can be
manufactured using equipment such as that available as SB 51-1/T,
SBL 50 and SB 53-2/T from Merz Verpackungmaschinen GmBH. Snus
pouches can be provided as individual pouches, or a plurality of
pouches (e.g., 2, 4, 5, 10, 12, 15, 20, 25 or 30 pouches) can
connected or linked together (e.g., in an end-to-end manner) such
that a single pouch or individual portion can be readily removed
for use from a one-piece strand or matrix of pouches.
[0068] The invention is not limited to snus-type smokeless tobacco
products. For example, the mixture of tobacco material and
flavorants comprising at least one isolated flavor compound and/or
tobacco-derived organic extract can also be incorporated into
various smokeless tobacco forms such as loose moist snuff, loose
dry snuff, chewing tobacco, pelletized tobacco pieces, extruded
tobacco strips or pieces, finely divided or milled agglomerates of
powdered pieces and components, flake-like pieces (e.g., that can
be formed by agglomerating tobacco formulation components in a
fluidized bed), molded tobacco pieces (e.g., formed in the general
shape of a coin, cylinder, bean, cube, or the like), pieces of
tobacco-containing gum, products incorporating mixtures of edible
material combined with tobacco pieces and/or tobacco extract,
products incorporating tobacco (e.g., in the form of tobacco
extract) carried by a solid inedible substrate, and the like. For
example, the smokeless tobacco product can have the form of
compressed tobacco pellets, multi-layered extruded pieces, extruded
or formed rods or sticks, compositions having one type of tobacco
formulation surrounded by a different type of tobacco formulation,
rolls of tape-like films, readily water-dissolvable or
water-dispersible films or strips (see, for example, US Pat. Appl.
Pub. No. 2006/0198873 to Chan et al.), or capsule-like materials
possessing an outer shell (e.g., a pliable or hard outer shell that
can be clear, colorless, translucent or highly colored in nature)
and an inner region possessing tobacco or tobacco flavor (e.g., a
Newtoniam fluid or a thixotropic fluid incorporating tobacco of
some form).
[0069] In some embodiments, smokeless tobacco products of the
invention can have the form of a lozenge, tablet, microtab, or
other tablet-type product. See, for example, the types of lozenge
formulations and techniques for formulating or manufacturing
lozenges set forth in U.S. Pat. No. 4,967,773 to Shaw; U.S. Pat.
No. 5,110,605 to Acharya; U.S. Pat. No. 5,733,574 to Dam; U.S. Pat.
No. 6,280,761 to Santus; U.S. Pat. No. 6,676,959 to Andersson et
al.; U.S. Pat. No. 6,248,760 to Wilhelmsen; and U.S. Pat. No.
7,374,779; US Pat. Pub. Nos. 2001/0016593 to Wilhelmsen;
2004/0101543 to Liu et al.; 2006/0120974 to Mcneight; 2008/0020050
to Chau et al.; 2009/0081291 to Gin et al.; and 2010/0004294 to
Axelsson et al.; which are incorporated herein by reference.
[0070] Depending on the type of smokeless tobacco product being
processed, the tobacco product can include one or more additional
components in addition to the tobacco material and the flavorants
comprising at least one flavor compound and/or organic extract
isolated from tobacco-derived black liquor. For example, the
tobacco material and the tobacco-derived flavorants can be
processed, blended, formulated, combined and/or mixed with other
materials or ingredients, such as other tobacco materials or
flavorants, fillers, binders, pH adjusters, buffering agents,
salts, sweeteners, colorants, disintegration aids, humectants, and
preservatives (any of which may be an encapsulated ingredient).
See, for example, those representative components, combination of
components, relative amounts of those components and ingredients
relative to tobacco, and manners and methods for employing those
components, set forth in US Pat. Pub. Nos. 2011/0315154 to Mua et
al. and 2007/0062549 to Holton, Jr. et al. and U.S. Pat. No.
7,861,728 to Holton, Jr. et al., each of which is incorporated
herein by reference.
[0071] In various embodiments, at least one flavor compound and/or
organic extract isolated from tobacco-derived black liquor can be
incorporated into smokeless tobacco products in the form of a
flavorant (or a component thereof) in an electronic smoking
article. There have been proposed numerous smoking products, flavor
generators, and medicinal inhalers that utilize electrical energy
to vaporize or heat a volatile material, or attempt to provide the
sensations of cigarette, cigar, or pipe smoking without burning
tobacco to a significant degree. See, for example, the various
alternative smoking articles, aerosol delivery devices and heat
generating sources set forth in the background art described in
U.S. Pat. No. 7,726,320 to Robinson et al., U.S. Pat. Pub. Nos.
2013/0255702 to Griffith Jr. et al., 2014/0000638 to Sebastian et
al., 2014/0060554 to Collett et al., 2014/0096781 to Sears et al.,
2014/0096782 to Ampolini et al., and 2015/0059780 to Davis et al.,
which are incorporated herein by reference in their entirety.
[0072] An exemplary embodiment of an electronic smoking article 200
is shown in FIG. 4. As illustrated therein, a control body 202 can
be formed of a control body shell 201 that can include a control
component 206, a flow sensor 208, a battery 210, and an LED 212. A
cartridge 204 can be formed of a cartridge shell 203 enclosing a
reservoir housing 244 that is in fluid communication with a liquid
transport element 236 adapted to wick or otherwise transport an
aerosol precursor composition stored in the reservoir housing to a
heater 234. An opening 228 may be present in the cartridge shell
203 to allow for egress of formed aerosol from the cartridge 204.
Such components are representative of the components that may be
present in a cartridge and are not intended to limit the scope of
cartridge components that are encompassed by the present
disclosure. The cartridge 204 may be adapted to engage the control
body 202 through a press-fit engagement between the control body
projection 224 and the cartridge receptacle 240.
[0073] Such engagement can facilitate a stable connection between
the control body 202 and the cartridge 204 as well as establish an
electrical connection between the battery 210 and control component
206 in the control body and the heater 234 in the cartridge. The
cartridge 204 also may include one or more electronic components
250, which may include an IC, a memory component, a sensor, or the
like. The electronic component 250 may be adapted to communicate
with the control component 206. The various components of an
electronic smoking device according to the present disclosure can
be chosen from components described in the art and commercially
available.
[0074] In various embodiments, the aerosol precursor composition
can comprise a flavorant comprising at least one tobacco-derived
flavor compound and/or organic extract isolated from
tobacco-derived black liquor. Exemplary formulations for aerosol
precursor materials that may be used according to the present
disclosure are described in U.S. Pat. No. 7,217,320 to Robinson et
al.; U.S. Pat. Pub. Nos. 2013/0008457 to Zheng et al.; 2013/0213417
to Chong et al.; 2014/0060554 to Collett et al.; and 2014/0000638
to Sebastian et al., the disclosures of which are incorporated
herein by reference in their entirety. Other aerosol precursors
that can incorporate at least one tobacco-derived flavor compound
and/or organic extract isolated from tobacco-derived black liquor
described herein include the aerosol precursors that have been
incorporated in the VUSE.RTM. product by R. J. Reynolds Vapor
Company, the BLU.TM. product by Imperial Tobacco, the MISTIC
MENTHOL product by Mistic Ecigs, and the VYPE product by CN
Creative Ltd. Also desirable are the so-called "smoke juices" for
electronic cigarettes that have been available from Johnson Creek
Enterprises LLC.
EXPERIMENTAL
[0075] Aspects of the present invention are more fully illustrated
by the following examples, which are set forth to illustrate
certain aspects of the present invention and are not to be
construed as limiting thereof.
Example 1
[0076] Flavorful compounds are isolated from tobacco stalk black
liquor obtained during the pulping of burley tobacco stalk.
[0077] Burley tobacco stalk is subjected to pulping and bleaching
processes resulting in a white, high .alpha.-cellulose pulp and
residual black liquor. The caustic (i.e., soda) pulping process
involves exposing de-pithed and decorticated stalk material to a
40% NaOH solution (soda liquor) at a ratio of 5:1 liquor to solid
on a weight basis. The stalks and liquor are then subjected to 160
psi of pressure at a temperature of 100.degree. C. for 2 hours. The
resulting black liquor is separated from the solid material using
filter mesh (20 .mu.m). The black liquor has a pH of 13.
[0078] Two liters of tobacco stalk black liquor is transferred to a
4 L beaker. The pH is reduced from 13 to 4 by adding 5N HCl to the
beaker, which results in a thick brown precipitate. The mixture of
liquor and precipitate is added exhaustively to 50 mL conical
centrifuge tubes and centrifuged at 2500 rpm for 10 minutes. The
liquor is decanted from the precipitate pellet, which yields a more
translucent brown liquid.
[0079] The clarified liquor is adjusted to pH 7.5 and subjected to
liquid-liquid extraction with methyl-t-butyl-ether (MTBE). About
400 mL of clarified black liquor is added to four 1 L separatory
funnels (2 L starting volume, plus HCl volume, minus the
precipitate contribution to volume results in approximately 1600 mL
final volume). 150 mL of MTBE is added to each separatory funnel
and then shaken three times at one minute intervals. After the
third agitation, the contents of the funnel are allowed to
partition for five minutes after which the funnel is drained and
each layer, aqueous and organic, is captured in separate
containers. A second liquid-liquid extraction of the aqueous layer
is performed using the above conditions.
[0080] The MTBE fractions from both extractions are mixed and turbo
evaporated at 40.degree. C. and nitrogen pressure at 10 psi. The
resulting residue, 2 mL, is mixed with 200 proof ethanol to a final
volume of 3 mL and subjected to GC-MS analysis. The remaining
aqueous portion from the liquid-liquid extraction is allowed to
stand in the fume hood overnight to remove any remaining MTBE and
then stored for future evaluation.
[0081] Major peaks in the GC-MS chromatogram include nicotine,
vanillin, 2,6-dimethoxyphenol, acetovanillone, syringaldehyde,
acetosyringone, phenol, and guaiacol. The extract has a unique
aroma, smoky vanilla, combined with the presence of nicotine.
Other, smaller peaks include corylone, phenethyl alcohol, ethyl
guaiacol, myosmine, nicotyrine, furancarboxaldehyde, and
bipyridine.
Example 2
[0082] Flavorful compounds are isolated from tobacco stalk black
liquor obtained during the pulping of burley tobacco stalk.
Clarified black liquor is obtained according to the process
described in Example 1 above.
[0083] The clarified liquor is adjusted to pH 7.5 and subjected to
liquid-liquid extraction with MTBE and ethyl acetate (EtOAc). About
500 mL of clarified black liquor is added to four 1 L separatory
funnels (2.5 L starting volume, plus HCl volume, minus the
precipitate contribution to volume results in approximately 2000 mL
final volume). 250 mL of MTBE is added to each separatory funnel
and then shaken three times at one minute intervals. After the
third agitation, the contents of the funnel are allowed to
partition for five minutes after which the funnel is drained and
each layer, aqueous and organic, is captured in separate
containers. A second liquid-liquid extraction of the aqueous layer
is performed using MTBE and the above conditions. A third
liquid-liquid extraction is performed. 250 mL of ethyl acetate is
added to the aqueous layer of each refilled funnel. Each funnel is
agitated as prescribed and the partitioned layers are captured in
separate vessels.
[0084] The MTBE fractions from the first two extractions are mixed
and turbo evaporated at 40.degree. C. and nitrogen pressure at 10
psi. The ethyl acetate fractions are combined and evaporated
separately from the MTBE extracts using a similar evaporation
protocol which differs only in the evaporation step (the ethyl
acetate is rotary evaporated using a vacuum of 300 mmHg instead).
The final, evaporated volume for the MTBE and ethyl acetate
fractions is 3 mL and 1 mL, respectively. The MTBE evaporate has a
smoky vanilla aroma while the ethyl acetate evaporate has a sweet,
vanilla smell. Both fractions are subjected to GC-MS analysis.
[0085] The chromatograms of the GC-MS analyses are produced from
the injection of a 1:150 dilution of the final concentrated extract
so as to perform semi-quantitative analysis of nicotine and several
flavors. Major peaks in the GC-MS chromatogram for the MTBE extract
dilution include nicotine, vanillin, 2,6-dimethoxyphenol,
acetovanillone, syringaldehyde, acetosyringone, phenol, and
guaiacol. The extract has a unique aroma, smoky vanilla, combined
with the presence of nicotine. Major peaks in the GC-MS
chromatogram for the ethyl acetate extract dilution include
nicotine, vanillin, 2,6-dimethoxyphenol, acetovanillone,
syringaldehyde, and acetosyringone. The extract has a unique aroma,
smoky vanilla, combined with the presence of nicotine. Phenol and
guaiacol, generally characterized as having smoky aroma and flavor
character, are relatively lower in the ethyl acetate extract
chromatogram.
[0086] Semi-quantitative analysis is performed on the MTBE and
ethyl acetate extracts for the following analytes:
2,6-dimethoxyphenol, vanillin, acetovanillone, and nicotine. For
the MTBE extract, there is 69 mg of 2,6-dimethoxyphenol (23 mg/mL),
60 mg of vanillin (20 mg/mL), 60 mg of acetovanillone (20 mg/mL),
and 393 mg of nicotine (131 mg/mL) extractable from the 3 mL of
MTBE extract. For the ethyl acetate extract, there is 3 mg of
2,6-dimethoxyphenol (3 mg/mL), 28 mg of vanillin (28 mg/mL), 14 mg
of acetovanillone (14 mg/mL), and 46 mg of nicotine (46 mg/mL)
extractable from the 1 mL of MTBE extract. As such, there is a
total of 72 mg of 2,6-dimethoxyphenol, 88 mg of vanillin, 74 mg of
acetovanillone, and 439 mg of nicotine extractable from the extract
obtained from 2.5 L of black liquor (starting volume). It is
estimated that about 40 grams of vanillin can be extracted from
1000 L of black liquor using this extraction protocol.
Example 3
[0087] Flavorful compounds are isolated from tobacco stalk black
liquor obtained during the pulping of burley tobacco stalk.
[0088] Burley tobacco stalk is subjected to pulping and bleaching
processes resulting in a white, high .alpha.-cellulose pulp and
residual black liquor. The caustic (i.e., soda) pulping process
involves exposing de-pithed and decorticated stalk material to a
40% NaOH solution (soda liquor) at a ratio of 5:1 liquor to solid
on a weight basis. The stalks and liquor are then subjected to 160
psi of pressure at a temperature of 100.degree. C. for 2 hours. The
resulting black liquor is separated from the solid material using
filter mesh (20 .mu.m). The black liquor has a pH of 13.
[0089] Two liters of tobacco stalk black liquor is transferred to a
4 L beaker. The pH is reduced from 13 to 4 by adding 5N
H.sub.2SO.sub.4 to the beaker, which results in a thick brown
precipitate. The mixture of liquor and precipitate is added
exhaustively to 750 mL conical centrifuge tubes and centrifuged at
2500 rpm for 10 minutes. The liquor is decanted from the
precipitate pellet, which yields a more translucent brown
liquid.
[0090] Half of the final volume, 900 mL, is lowered from pH 4 to 3
with the addition of more H.sub.2SO.sub.4 (BL-acidic). The
remaining half of the final volume is adjusted to pH 7.5 with NaOH
(BL-basic). Half of the volume of BL-acidic is added to each of two
different separatory funnels and half of the volume of BL-basic is
added to each of two different separatory funnels. To one BL-acidic
and BL-basic funnel is added 250 mL of MTBE. For the remaining
BL-acidic and BL-basic funnels, 250 mL of ethyl acetate is added to
each. All four flasks are shaken for 10 seconds, allowed to rest
for 2 minutes, and shaken again for 10 seconds. After the two
phases settle out, they are collected in one liter glass containers
(8 total: 4 solvent phase and 4 aqueous phase). Each aqueous phase
is returned to its respective funnel and the same liquid-liquid
extraction is performed for each funnel a second time with the same
solvent type as the first extraction. The solvent from each
extraction for the same separatory funnel is combined and dried
using rotary evaporation. This results in approximately 500 mL of
solvent volume in each container. Aliquots from each of the eight
containers are transferred to GC vials for analysis.
[0091] Major peaks in the GC-MS chromatogram for the pooled ethyl
acetate extract of the acidic black liquor include acetic acid,
3,5-dimethylcyclopentenolone, corylone, nicotine, guaiacol,
4-vinyl-2-methylphenol, vanillin, 2,6-dimethoxyphenol,
acetovanillone, syringaldehyde, and acetosyringone. In this
chromatogram, virtually no nicotine is present and a fairly pure
guaiacol peak is observed (nicotine and guaiacol co-elute at 14.8
minutes). The same major peaks are identified of the corresponding
aqueous layer of the pooled ethyl acetate extract of the acidic
black liquor, however, nicotine is the foremost peak in the aqueous
phase. The nicotine likely exists as a salt and is therefore not
extractable into the organic phase.
[0092] Major peaks in the GC-MS chromatogram for the pooled ethyl
acetate extract of the basic black liquor include acetic acid,
3,5-dimethylcyclopentenolone, corylone, nicotine, guaiacol,
4-vinyl-2-methylphenol, vanillin, 2,6-dimethoxyphenol,
acetovanillone, syringaldehyde, and acetosyringone. Nicotine exists
as a free base at this pH and is therefore easily extracted from
the aqueous layer with the organic solvent and is by far the
largest peak in the chromatogram (very little guaiacol contribution
to the peak at the given retention time). The same major peaks are
identified of the corresponding aqueous layer of the pooled ethyl
acetate extract of the basic black liquor, however, there is no
noticeable nicotine in the aqueous portion.
[0093] Major peaks in the GC-MS chromatogram for the pooled MTBE
extract of the acidic black liquor include acetic acid,
3,5-dimethylcyclopentenolone, corylone, nicotine, guaiacol,
4-vinyl-2-methylphenol, vanillin, 2,6-dimethoxyphenol,
acetovanillone, syringaldehyde, and acetosyringone. Once again,
very little to no nicotine was extracted in the organic phase due
to the low pH of the aqueous phase. The same major peaks are
identified of the corresponding aqueous layer of the pooled MTBE
extract of the acidic black liquor, however, nicotine is the
foremost peak in the aqueous phase because nicotine remained in the
salt form due to the low pH of the aqueous phase.
[0094] Major peaks in the GC-MS chromatogram for the pooled MTBE
extract of the basic black liquor include acetic acid,
3,5-dimethylcyclopentenolone, corylone, nicotine, guaiacol,
4-vinyl-2-methylphenol, vanillin, 2,6-dimethoxyphenol,
acetovanillone, syringaldehyde, and acetosyringone. Nicotine exists
as a free base at this pH and is therefore easily extracted from
the aqueous layer with the organic solvent and is by far the
largest peak in the chromatogram (very little guaiacol contribution
to the peak at the given retention time). The same major peaks are
identified of the corresponding aqueous layer of the pooled MTBE
extract of the basic black liquor, however, there is no noticeable
nicotine in the aqueous portion.
[0095] Semi-quantitative analysis is performed on each of the 8
total extracts for the following analytes: acetic acid,
3,5-dimethylcyclopentenolone, corylone, nicotine, guaiacol,
4-vinyl-2-methylphenol, vanillin, 2,6-dimethoxyphenol,
acetovanillone, syringaldehyde, and acetosyringone.
2,6-dimethoxyphenol, 3,5-dimethylcyclopentenolone, corylone and
vanillin are not fully extracted at basic pH, as evidenced by their
presence in the aqueous portion post-solvent extraction. Nearly
complete extraction of flavor compounds is achieved by multistep
liquid-liquid extraction with the same solvent at acidic pH. Acetic
acid is extractable from an aqueous layer with solvent, but is more
amenable to solvent partitioning with an acidic pH of the aqueous
layer. Using MTBE and ethyl acetate results in similar chemical
profiles in the final extracts, however, MTBE is more easily
evaporated.
Example 4
[0096] Flavorful compounds are isolated from tobacco stalk black
liquor obtained during the standard Kraft pulping process (NaOH,
NaS) of tobacco stalks.
[0097] A 100 mL aliquot of the black liquor (pH about 14) is
extracted two times with equi-volume portions of MTBE. The MTBE
layer is separated, dried over Na.sub.2SO.sub.4, filtered and
concentrated on a rotary evaporator.
[0098] A second 100 mL aliquot of the black liquor is neutralized
using 2N HCL to an approximate pH of 7, resulting in an enormous
amount of precipitate. The entire mixture is extracted two times
with equi-volume portions of MTBE. The MTBE layer is separated,
dried over Na.sub.2SO.sub.4, filtered and concentrated on a rotary
evaporator.
[0099] The two extract samples are analyzed using GC-MS on a
DB-Wax, 30 m.times.0.25 mm with a 0.25.mu. film thickness using a
temperature program from 60.degree. C. to 220.degree. C. at
5.degree. C./min. The chromatogram of the MTBE extract of the black
liquor with no pH adjustment shows that nicotine is the major
component. The other identified compounds include modest amounts of
myosmine, nicotyrine, and bipyridine, all alkaloid degradation
products and very small amounts of phenethyl alcohol,
2-acetylpyrrole, and 4-ethylguaiacol. The chromatogram of the MTBE
extract of the black liquor after pH adjustment to approximately 7
with 2N HCl shows components typical to those identified in
Examples 1-3 above, including substituted phenols and vanillic
compounds.
Example 5
[0100] Flavorful compounds are isolated from tobacco stalk black
liquor obtained during the pulping of burley tobacco stalk.
[0101] Burley tobacco stalk is subjected to pulping and bleaching
processes resulting in a white, high .alpha.-cellulose pulp and
residual black liquor. The caustic (i.e., soda) pulping process
involves exposing de-pithed and decorticated stalk material to a
40% NaOH solution (soda liquor) at a ratio of 5:1 liquor to solid
on a weight basis. The stalks and liquor are then subjected to 160
psi of pressure at a temperature of 100.degree. C. for 2 hours. The
resulting black liquor is separated from the solid material using
filter mesh (.about.20 .mu.m). The black liquor has a pH of 14 or
greater.
[0102] Black liquor samples are filtered through a 0.22 micron
filter and two different Cross Flow Filtration membranes to isolate
organic molecules less than 2 KDa and 1 KDa molecular weight
cut-off. 100 mL samples of the 1 KDa and 2 KDa retentates and
permeates are each extracted with 100 mL of MTBE in a 500 mL
separatory funnel. The MTBE extracts are separated, dried over
sodium sulfate, and concentrated using rotary evaporator to
approximately 1 mL. The concentrated extract is transferred to a GC
vial using MTBE and analyzed.
[0103] A second set of 100 mL samples of the retentates and
permeates are placed in beakers with magnetic stirring. 2N
H.sub.2SO.sub.4 is added in small aliquots until the pH reaches
approximately 6. A light precipitate is formed. The pH adjusted
samples are then extracted with MTBE, dried, concentrated, and
analyzed.
[0104] At pH 14, the chromatogram contains predominantly nicotine
and very little else. At pH 6, the chromatogram shows numerous
components in four groups. Group 1 represented by acetic acid is
the small chain organic acids. Group 2 is sugar degradation
products such as 3,5-dimethylcyclopentenolone and corylone. Group 3
is phenols including guaiacol (methoxyphenols) and dimethoxyphenol.
Group 4 contains vanillin, acetovanillone, syringaldehyde, and
acetosyringone. Both extracts are distinct and display no overlap.
Specifically, there is no nicotine in the pH 6 extract and there is
only nicotine in the pH 14 extract. In the pH 6 extract, nicotine
has formed a salt with sulfate from the sulfuric acid and is
preferentially soluble in water which accounts for its absence in
the pH 6 extract. Likewise, in the pH 14 extract, nicotine is in
its non-salt form and can be extracted into MTBE. The phenols in pH
14 environments are ionized and insoluble in organic solvents
explaining their absence in the pH 14 extract. If performed
consecutively, this set of extractions, pH 14 followed by pH 6,
allows for a nicotine-free extract of black liquor that contains a
flavorful mixture of phenols including smoky types (guaiacol) and
sweet types (vanillin).
[0105] The total amount of both the 1 KDa and 2 KDa permeates (590
mL) is combined into one sample and extracted with a like volume of
MTBE twice. The MTBE is discarded. The water layer is then
neutralized to slightly acidic pH with 140 mL of 2N
H.sub.2SO.sub.4, extracted twice with 750 mL of MTBE, dried using
Na.sub.2SO.sub.4, and concentrated to dryness on the rotary
evaporator, yielding 1.345 g of solvent free extract.
[0106] Filtration of the black liquor using small micron filters
(0.22 micron) and subsequent filtration through 1 KDa and 2 KDa
filters significantly improves the downstream MTBE extraction of
the black liquor. Initial shaking of the filtered aqueous black
liquor with MTBE results in an emulsion that rapidly separated into
two relatively clean fractions that can easily be separated.
Minimal precipitates are encountered and are easily filtered away
using filter paper and vacuum filtration. Drying of the organic
layer is still used, but is not extraordinary in any respect.
Pre-filtration to remove fine dissolved solids and size exclusion
filtration provides for an easier organic extraction process of
black liquor.
[0107] Many modifications and other embodiments of the invention
will come to mind to one skilled in the art to which this invention
pertains having the benefit of the teachings presented in the
foregoing description. Therefore, it is to be understood that the
invention is not to be limited to the specific embodiments
disclosed and that modifications and other embodiments are intended
to be included within the scope of the appended claims. Although
specific terms are employed herein, they are used in a generic and
descriptive sense only and not for purposes of limitation.
* * * * *