U.S. patent application number 10/186833 was filed with the patent office on 2004-01-01 for polynuclear compounds derived from an organic solution.
Invention is credited to Lightner, Gene E..
Application Number | 20040000381 10/186833 |
Document ID | / |
Family ID | 29779946 |
Filed Date | 2004-01-01 |
United States Patent
Application |
20040000381 |
Kind Code |
A1 |
Lightner, Gene E. |
January 1, 2004 |
Polynuclear compounds derived from an organic solution
Abstract
Polynuclear compounds dissolved and contained within an organic
solvent are separated from the organic solvent by rendering the
organic compounds insoluble within the organic solvent. Accordingly
this invention removes polynuclear compounds from a saturated
organic solvent. The polynuclear compounds are derived from black
liquor obtained from kraft digestion. Whereby polynuclear
compounds, substantially free of an organic solvent, are obtained
from the organic solvent.
Inventors: |
Lightner, Gene E.; (Federal
Way, WA) |
Correspondence
Address: |
Gene E. Lightner
706 SW 296th St.
Federal Way
WA
98023
US
|
Family ID: |
29779946 |
Appl. No.: |
10/186833 |
Filed: |
July 1, 2002 |
Current U.S.
Class: |
162/29 ; 162/32;
162/72; 162/77; 162/82 |
Current CPC
Class: |
D21C 11/0007 20130101;
D21C 11/0042 20130101 |
Class at
Publication: |
162/29 ; 162/32;
162/72; 162/82; 162/77 |
International
Class: |
D21C 011/00; D21C
003/20; D21C 011/04 |
Claims
What is claimed is:
1. A method to derive polynuclear compounds dissolved in an organic
solvent, which comprises: providing an organic solvent containing
dissolved polynuclear compounds, and separating said polynuclear
compounds from said organic solvent, and recycling the heretofore
separated organic solvent, whereby polynuclear compounds
substantially free of an organic solvent, are obtained from an
organic solvent.
2. The method as described in claim 1 wherein said polynuclear
compounds are derived from black liquor obtained from kraft
digestion.
3. The method as described in claim 1 wherein said polynuclear
compounds, substantially free of said organic solvent, are
subjected to delignification of wood chips within kraft
digestion.
4. The method as described in claim 1 wherein said polynuclear
compounds are selected from the group of anthraquinone,
2-methyl-anthraquinone including an individual or a combination
thereof.
5. The method as described in claim 1 wherein said organic solvent
is selected from the group of hydrocarbons, organic halogens and
alcohols including an individual or a combination thereof.
6. The method as described in claim 1 wherein said organic solvent
containing dissolved polynuclear compounds is subjected to cooling
to provide phases of polynuclear compounds and a phase of organic
solvent saturated with polynuclear compounds.
7. The method as described in claim 6 wherein the phases are
subjected to a centrifuge to separate phases by differences in
density to obtain organic solvent for recycle, and polynuclear
compounds substantially devoid of the organic solvent.
8. The method as described in claim 1 wherein said polynuclear
compounds are supplied from kraft pulping digestion.
9. The method as described in claim 1 wherein said polynuclear
compounds are supplied from soda pulping digestion.
Description
BACKGROUND OF THE INVENTION
[0001] Kraft pulping digestion process employs liquor containing
sodium hydroxide and sodium sulfide to digest wood chips to produce
pulp and remove lignins from wood to create black liquor containing
depolymerized, dispersed and dissolved lignins from the wood. Black
liquor additionally containing sodium hydroxide and sodium sulfide.
Sodium sulfide forms malodorous mercaptons, causing undesired
emissions in air. In order to reduce sodium sulfide concentration
in "white liquor," polynuclear compounds can be added to the
process to considerably replace sodium sulfide for its intended
function, to catalyze removal of lignins from wood. This procedure
is described in U.S. Pat. No. 4,012,280. Polynuclear compounds are
consumed by combustion and not recycled.
[0002] Accordingly, it is believed that, a method for recovery of
polynuclear compounds is without development.
[0003] Therefore, an object of this invention is to obviate many of
the limitations and disadvantages of the prior art to digest wood
chips and form a black liquor containing polynuclear compounds.
[0004] This invention relates to a method of recycling the organic
solvent used to dissolve polynuclear compounds.
[0005] A significant object of this invention is to produce
polynuclear compounds from a black liquor.
[0006] Another object of this invention is to utilize an organic
solvent to dissolve polynuclear compounds from black liquor.
[0007] An additional object of this invention is to remove
polynuclear compounds from the organic solvent.
[0008] Yet another object of this invention is to recycle
polynuclear compounds and recycle the organic solvent.
[0009] With the above and other objects in view, this invention
relates to the novel features and alternatives and combinations
presently described in the brief description of the invention.
PHRASEOLOGY APPLIED IN THE INVENTION
[0010] Wood chips in the presence of white liquor, containing
sodium hydroxide at an elevated temperature, will digest wood chips
to result in cellulose pulp and form black liquor. White liquor
containing sodium sulfide, polynuclear compounds and (or)
polysulfide, provide catalysts to delignify wood chips, within a
kraft process, and form black liquor. Polynuclear compounds
employed as a catalyst, will provide more effectiveness for
delignification of wood chips faster than sodium sulfide alone.
Addition of antraqinone or equivalent to a kraft process is
described on the internet http://www.paperloop.com "Paper Help
Online," pages 1-2, Antraqinone, or equivalent.
[0011] are polynuclear compounds, selected from the group of
anthraquinone, 2-methyl-anthraquinone including an individual or a
combination thereof Polynuclear compounds from a black liquor are
dissolved in an organic solvent to become a solution of polynuclear
compounds dissolved in an organic solvent. Polynuclear compounds
are separated from the solution to create a saturated organic
solvent solution for recycle. This separation method is often
performed by cooling the solution to form two phases followed by a
centrifuge to separate a phase of polynuclear compounds from a
phase of the cooled solution. Both separated phases are recycled to
carry out their specific functions. Solubility of anthraquinone is
given for several organic solvents at different temperatures
indicating that anthraquinone is of limited solubility. This
information is presented within Merck Index, eighth edition, pages
88-89. An organic solvent to dissolve polynuclear compounds is
usually selected from the group of hydrocarbons, organic halogens
and alcohols.
[0012] A centrifuge is employed to separate solids of dissimilar
density from that of fluids by generating a force greater than the
force of gravity. This implementation is described in Unit
Operations, edited by Brown, et al., page 258.
BRIEF DESCRIPTION OF THE INVENTION
[0013] The present invention, in its broadest aspect, is a method
to derive polynuclear compounds dissolved in an organic solvent.
This invention defines a method to obtain polynuclear compounds,
substantially free of the organic solvent used to dissolve the
polynuclear compounds. The method comprises: providing an organic
solvent containing dissolved polynuclear compounds, and separating
the polynuclear compounds from the organic solvent. This method
provides recycling of the heretofore separated organic solvent and
polynuclear compounds, whereby polynuclear compounds, substantially
free of an organic solvent, are obtained from an organic
solvent.
[0014] The method, depicted herein, originates from a black liquor
containing polynuclear compounds.
[0015] Key features of this invention are:
[0016] Separating polynuclear compounds from an organic solvent
containing dissolved polynuclear compounds.
[0017] Polynuclear compounds are derived from a black liquor.
[0018] Polynuclear compounds are employed for delignification of
wood chips contained within a kraft digestion setting.
[0019] Polynuclear compounds include antraqinone, or an
equivalent.
[0020] Producing polynuclear compounds, substantially free of the
organic solvent.
[0021] Recycling the organic solvent to be used to dissolve
polynuclear compounds.
[0022] Recycling polynuclear compounds for catalysis and
delignification of lignins contained within wood chips.
BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Features that are considered characteristic of this
invention are set forth in the appended claims. This invention,
however, both as to its origination and method of operations as
well as additional advantages will best be understood from the
following description when read in conjunction with the
accompanying drawings in which:
[0024] FIG. 1 is a flow sheet denoting the invention as set forth
in the appended claims.
[0025] FIG. 2 is a flow sheet denoting a method to create black
liquor containing polynuclear compounds.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0026] The flow diagram of FIG. 1 illustrates the preferred
embodiment of the present invention. In the diagram, rectangles
represent stages or functions of the present invention and not
necessarily separate components. Arrows indicate direction of flow
of material in the method.
[0027] Referring to FIG. 1, solvent and dissolved polynuclear
compounds 10, conveyed to heat exchanger stage 12, and cooled by
water 14 to establish phases 16, and heated water 14A. Phases 16,
are conveyed to centrifuge 18, to produce polynuclear compounds 20,
and solvent saturated by polynuclear compounds 22. Solvent
saturated by polynuclear compounds 22, is recycled to dissolve
additional polynuclear compounds contained within black liquor
obtained from kraft digestion. Centrifuged polynuclear compounds
20, are recycled to act as a catalyst for delignifiction of wood
chips provided for kraft digestion. After cooling to provide phases
16, the phases are subjected to a centrifuge 18 to separate the
phases by difference in density.
[0028] Referring to FIG. 2, a flow sheet is portrayed denoting a
method for kraft digestion of wood chips 30 supplied to a kraft
digestion stage 32, to produce pulp 36 and black liquor 38 from
white liquor 34 and recycled polynuclear compounds 20 to act as a
catalyst for delignification.
* * * * *
References