U.S. patent application number 10/115746 was filed with the patent office on 2004-10-28 for water free pulp from pulp slurry.
Invention is credited to Lightner, Gene E..
Application Number | 20040211532 10/115746 |
Document ID | / |
Family ID | 33297788 |
Filed Date | 2004-10-28 |
United States Patent
Application |
20040211532 |
Kind Code |
A1 |
Lightner, Gene E. |
October 28, 2004 |
Water free pulp from pulp slurry
Abstract
By providing a pulp slurry, containing ink and water, and
subjecting the slurry to dewatering to produce pulp sludge
containing water is formed and a liquid, primarily water, is
obtained. Pulp sludge, removed from dewatering is subjected to
pressing to produce pressed pulp and expelled water. The expelled
water and liquid, primarily water, is combined and recycled to an
apparatus to create additional pulp slurry. Dewatered pressed pulp
is subjected to dehydration, to transfer water contained within
pulp, to air. Pulp resulting from dehydration is then subject to
bailing. Furthermore pulp is excluded from a deinking procedure to
permit ink to remain within the pulp. Whereby this invention
removes water from a pulp slurry and provides pulp substantially
devoid of water.
Inventors: |
Lightner, Gene E.; (Federal
Way, WA) |
Correspondence
Address: |
Gene E. Lightner
706 SW 296th St.
Federal Way
WA
98023
US
|
Family ID: |
33297788 |
Appl. No.: |
10/115746 |
Filed: |
April 3, 2002 |
Current U.S.
Class: |
162/4 ;
162/47 |
Current CPC
Class: |
Y02W 30/64 20150501;
D21B 1/32 20130101; Y02W 30/646 20150501; D21C 5/025 20130101; Y02W
30/648 20150501 |
Class at
Publication: |
162/004 ;
162/047 |
International
Class: |
D21C 005/02 |
Claims
What is claimed is:
1. A method to separate pulp from an aqueous pulp slurry, which
comprises: providing a pulp slurry containing ink and water, and
providing dewatering means, and subjecting said pulp slurry to said
dewatering means to form pulp sludge and a liquid primarily water,
and removing said pulp sludge and said liquid from said dewatering
means, and subjecting said pulp sludge to dehydration to transfer
water within the pulp sludge to form pulp substantially devoid of
water, and creating additional pulp slurry containing ink and water
from said liquid whereby this invention removes water from a pulp
slurry and provides pulp substantially devoid of water.
2. The method as described in claim 1 wherein said pulp slurry is
obtained from waste paper.
3. The method as described in claim 2 wherein the pulp slurry
contains ink from waste paper.
4. The method as described in claim 2 wherein the waste paper is
selected from the group of, newspapers, office papers and cardboard
including an individual or a combination thereof.
5. The method as described in claim 1 wherein said pulp,
substantially devoid of water, is subjected to bailing to form
bales of pulp.
6. The method as described in claim 1 wherein said pulp slurry is
produced from waste paper within an apparatus for pulping.
7. The method as described in claim 1 wherein said pulp,
substantially devoid of water, is subjected to gasification.
8. The method as described in claim 7 wherein gasification from the
pulp is used to power fuel cells.
9. The method as described in claim 8 wherein the fuel cells are
selected from the group consisting of molten carbonate fuel cells,
solid oxide fuel cells or a combination thereof.
10. The method as described in claim 8 wherein the fuel cells are
stationary within a site.
11. The method as described in claim 1 wherein said pulp slurry is
produced from cellulose solids.
12. The method as described in claim 1 wherein said pulp slurry is
separated from matter unaffected by pulping.
13. The method as described in claim 1 wherein said pulp is
obtained from waste paper contained within municipal solid
waste.
14. The method as described in claim 1 wherein said method is
accomplished in batch form as well as by a continuous form.
15. The method as described in claim 1 wherein said pulp sludge is
subject to dehydration by air.
16. The method as described in claim 1 wherein said pulp sludge is
subject to dehydration by a drier.
17. The method as described in claim 1 wherein said pulp slurry is
produced from an apparatus to create additional pulp slurry.
18. The method as described in claim 1 wherein said pulp slurry
contains organic compounds.
19. The method as described in claim 1 wherein said dewatering
means is a filter to produce filtered pulp and an aqueous
filtrate.
20. The method as described in claim 1 wherein said dewatering
means is a filter press to produce pressed pulp and an expelled
liquid, primarily water.
Description
BACKGROUND OF THE INVENTION
[0001] A state of the art process for pulping waste paper and
deinking employing a hydrapulper to produce a pulp slurry is
described within in U.S. Pat. No. 5,512,133. Processes for deinking
is described, for example, within in U.S. Pat. Nos. 3,962,560,
4,311,552, 5,073,234 in which solvents are utilized to separate ink
from pulp. A method to separate plastics from municipal solid waste
is described by U.S. Pat. No. 5,297,742, and by U.S. Pat. No.
4,160,722. These patents depend on dissimilar, density of plastics
and a pulp slurry for separation. U.S. Pat. No. 3,991,60, discloses
a method of bailing dewatered, dried pulp and wrapping the
resulting bale with protective wire or strip.
[0002] This invention relates to a method of subjecting a slurry of
pulp to dewatering to form pulp sludge and liquid, primarily
water.
[0003] Therefore, an object of this invention is to obviate many of
the limitations and disadvantages of the prior art to form pulp
from waste cellulose solids.
[0004] A significant object of this invention is to produce pulp
significantly free of water from waste cellulose solids.
[0005] A secondary object of this invention is press pulp to reduce
water within pulp and create expelled water.
[0006] An additional object of this invention is to recycle
combined expelled water and liquid, primarily water, to form a
combination for creation of additional pulp slurry within a pulping
apparatus.
[0007] Another object of this invention is significant dehydration
of pulp.
[0008] Yet another object of this invention is to subject the
dehydrated pulp to bale formation.
[0009] Still another object of this invention is excluding pulp
from a deinking procedure to aid production of ink within pulp.
[0010] 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
[0011] Waste paper is with water, pulped by an apparatus for
pulping, commonly termed a hydrapulper, to produce a slurry of
pulp. A hydrapulper is described within "hydrapulper", located on
the internet, 2002, page 1, which pulps waste paper, with water,
into small pieces, to create a pulp slurry resembling "porridge".
The hydrapulper is fitted wit special devises for removing matter
such as wire, plastic, paper clips, staples etc. The slurry of
pulp, produced by waste paper, is then subjected to dewatering to
form a discharge of pulp sludge containing water and a liquid,
primarily water, is obtained. Filtering is one such dewatering
means as described by Brown, et al., within Unit Operations, 1950,
page 229 and page 241. Pulp sludge, removed from dewatering, is
subjected to pressing to produce expelled water and pressed pulp
moist with water. The expelled water is combined with liquid
containing water (and ink) to form additional pulp slurry.
[0012] Expelled water and liquid containing water may contain
unfiltered pulp. Pulp, moist with water, is subjected to
dehydration to transfer water from pulp to air. Pulp, defined by
this method, substantially free of water, is subjected to bale
formation to produce bales of pulp. Bales of pulp are transported
to a destination for planned utilization. Bales of pulp, after
reduction in size, become fibers of cellulose, and are then
subjected to gasification for utilization within fuel cells to
generate electricity from the energy of the pulp. Accordingly waste
paper contained within municipal solid waste (MSW) can be pulped to
create a slurry of pulp. Without using deinking procedures within
this method, production of pulp, essentially free of water,
involuntarily embodies ink.
[0013] Frequently a deinking procedure accompanies or precedes
pulping. This procedure is described within Handbook Of Pulp And
Paper Technology, Second Edition, 1970, Edited by Britt, pages
80-83. Deinked slurry of insoluble pulp is removed from the
hydrapulper and is usually de-watered and dried to produce dried
pulp. The pulp, excluded from a deinking procedure, will acquire
ink within pulp. The deinking procedure is accordingly needless
within the outlined method but is referred to for information
only.
BRIEF DESCRIPTION OF THE INVENTION
[0014] The present invention, in its broadest aspect, is a method
to produce pulp from an aqueous pulp slurry which comprises:
providing a pulp slurry, containing ink and water, and dewatering
means, and subjecting the pulp slurry to dewatering to form pulp
sludge and a liquid, primarily water. Upon removing the pulp sludge
and the liquid from the dewatering means, and subjecting the pulp
sludge to dehydration, to transfer water within the pulp sludge, to
form pulp substantially devoid of water. Pulp furthermore is
excluded from a needless deinking procedure to involuntarily embody
ink within the pulp. After creating additional pulp slurry from the
liquid, primarily water, whereby a pulp slurry is derived from a
liquid, primarily water, to create pulp substantially devoid of
water.
[0015] Key features of this invention are:
[0016] Pulp, commonly contains ink, and is accepted within the
pulp, so that deinking is unnecessary.
[0017] A pulp slurry is produced by waste paper in an apparatus for
pulping.
[0018] Upon subjecting pulp sludge to pressing, pressed pulp
results and expelled water is created.
[0019] The pressed pulp transfers contained water to air to form
pulp, substantially devoid of water.
[0020] Pressed pulp is subject to dehydration by a drier.
[0021] Pulp, substantially free of water, is subjected to bale
formation to form bales of pulp.
[0022] Baled pulp, after breaking and reduction in size, is
subjected to gasification to provide energy to power fuel
cells.
[0023] Liquid, containing water, is recycled to an apparatus for
pulping for additional production of a pulp slurry containing ink
and water.
[0024] The method can be accomplished in batch form, continuous
form, as well as by a combined form.
[0025] Pulp slurry, formed within a hydapulper, or similar device,
is separated from matter subject to pulping but unaffected by
pulping.
[0026] The pulp slurry contains water and organic compounds.
[0027] By supplying waste paper within a hydapulper, or similar
device, a pulp slurry is created
BRIEF DESCRIPTION OF THE DRAWINGS
[0028] The 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:
[0029] FIG. 1 is a flow sheet denoting the invention as set forth
in the appended claims.
[0030] FIG. 2 is a flow sheet representing a method for
gasification of pulp to apply resulting gas to power fuel
cells.
[0031] FIG. 3 is a flow sheet illustrative of a method to produce a
pulp slurry.
[0032] FIG. 4 is a flow sheet illustrative of a method to produce a
pulp sludge and a filtrate.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0033] 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
unnecessarily separate components. Arrows indicate direction of
flow of material in the method.
[0034] Referring to FIG. 1, pulp slurry containing ink and water
10, accordingly pulp, containing cellulose, is conveyed to pulp
dewatering stage 12, to create liquid, primarily water 14, and
produce pulp sludge 16 which is transferred to pulp pressing stage
18 to create pressed pulp 22 and expelled water 20. Pressed pulp 22
is conveyed to pulp dehydration stage 24 where air 26 transfers
water from pressed pulp to create dried pulp 28 and humid air 26A.
Dried pulp 28 is conveyed to bale formation stage 30, to be baled
and strapped by strapping 32 to create strapped bales 34. As a
result dried pulp 28 is baled and strapped for protection. Pulp
slurry containing ink and water 10 is sometimes produced from waste
paper contained within municipal solid waste, utilizing an
apparatus for creation of a pulp slurry. Waste paper for forming
pulp slurry containing ink and water 10, is frequently selected
from the group of newspaper, cardboard, office papers and municipal
solid waste including an individual or a combination thereof A
variety of substances contained within municipal solid waste is
separated from matter subject to pulping but unaffected by pulping.
Pulp, furthermore is excluded from a deinking procedure, so that
ink remaining within the pulp is appropriate. Liquid 14, primarily
water, commonly contains pulp of decreased size.
[0035] Referring to FIG. 2, strapped bales 34, are conveyed to pulp
bale breaking stage 36, to provide removed strapping 36A and
produce fibrous pulp 38 for transfer to gasification stage 40 to
react with steam 42 to produce gas 44. Gas 44 is conveyed to fuel
cells 46 to generate direct current 50 from air 48 which is used to
satisfy oxygen requirements and then discards purge 48A. The method
as described generally depend on fuel cells selected from the group
consisting of molten carbonate fuel cells, solid oxide fuel cells
or a combination thereof. Customarily the fuel cells are stationary
within a site. The intention of producing fibrous pulp 38 is to
create pulp with a reduction in size. Commonly, strapped bales of
pulp 34, are transported and stored prior to subjection to pulp
bale breaking stage 36.
[0036] Referring to FIG. 3, waste paper 10A, is conveyed to pulping
apparatus 52 and pulped by 14A. 14A is a combination of liquid,
primarily water, 14 and expelled water 20 to produce pulp slurry,
containing ink and water 10. Waste paper 10A is sometimes obtained
from waste paper contained within municipal solid waste. Generally
the method is stationary within a site.
[0037] Referring to FIG. 4, pulp slurry, containing ink and water,
10, is conveyed to filter media stage 54, to create pulp sludge 16
and filtrate 14A. Filter media stage 54, is commonly equipped with
filtering media or membranes.
* * * * *