CA2139884A1 - Use of polymers in the recycled fiber washing/deinking process - Google Patents
Use of polymers in the recycled fiber washing/deinking processInfo
- Publication number
- CA2139884A1 CA2139884A1 CA 2139884 CA2139884A CA2139884A1 CA 2139884 A1 CA2139884 A1 CA 2139884A1 CA 2139884 CA2139884 CA 2139884 CA 2139884 A CA2139884 A CA 2139884A CA 2139884 A1 CA2139884 A1 CA 2139884A1
- Authority
- CA
- Canada
- Prior art keywords
- recited
- cationic
- polymer
- acrylamide
- solids
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/001—Modification of pulp properties
- D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
- D21C9/005—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives organic compounds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/02—Working-up waste paper
- D21C5/025—De-inking
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
- D21C9/06—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents in filters ; Washing of concentrated pulp, e.g. pulp mats, on filtering surfaces
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Abstract
The present invention is directed to a method for increasing the retention on a washing/thickening device in an aqueous papermaking system. The method generally comprises adding to the furnish solids of the system an effective amount of a cationic polyacrylamide polymer.
Description
- 213~88~
USE OF POLYMERS IN THE RECYCLED FIBER
WASHING/DEINKING PROCESS
FIELD OF THE INVENTION
The use of recycled fibers is becoming an important aspect of papermaking both for economic and environmental reasons. The basic 10 manufacturing steps in the use of recycled fiber include the repulping of recovered paper, followed by the removal of printing inks from the fibers.
A typical deinking process utilizes a combination of chemical and mechanical techniques in several stages, whereby the ink is physically 15 removed from the fiber. The accepts (or fiber) from the deinking step are then typically treated through a series of washers and cleaners, in order to further remove contaminants and improve fiber quality. A dynamic washing/thickening device, such as a double nip thickener (DNT), is one such mechanical device co"l",only utilized. This high speed washing/
20 thickening device serves to remove ink and filler particles from the fibrous slurry.
Polymeric additives are commonly utilized in the papermaking process in order to coagulate/flocculate the fiber/filler slurry, thus improv-ing dewatering or retention of fine particles. These polymeric additives may be used as retention aids, drainage aids, clarification aids, sludge 5 dewatering aids, etc., depending upon the application in which they are employed. Polymers have not been known to be employed, nor was their use successful, with a dynamic belt washer/thickener.
The present invention relates to the use of a cationic polyacryla-10 mide polymer to increase the efficiency of a dynamic washing/thickeningdevice utilized in the papermaking/deinking processes. This polymer is preferably a high molecular weight cationic flocculant.
DETAILED DESCRIPTION OF THE INVENTION
The papermaking industry continually strives to improve productiv-ity and efficiency. The present invention provides improved production by increased washer/thickener retention. This results in increased wash-er/thickener capacity and overall deink plant production capacity. An-20 other result of improved retention is a lower solids content in the wash-er/thickener filtrate. Lower filtrate solids allow for less polymer usage in the clarifier, less sludge thickening and lower landfill costs.
Field studies were conducted at a northeast newsprint deinking 25 mill, wherein old newsprint (ONP) and magazines were repulped and deinked for use in the papermaking process. The subject mill utilized alkaline and acid deinking loops, in series, in order to treat the paper stock. Both the alkaline and acid loops contained DNT washers. The accepts from the DNT were further processed as fiber for use in the papermaking process; the fiitrate was then sent to a Dissolved Air Flota-tion (DAF) clarifier for further solids removal. The respective loops em-ploy two or more Double Nip Thickeners (DNTs) in parallel, thus the influ-5 ent flow is identical for the DNTs in a specific loop. This system permitsevaluation of polymeric additives by comparing the filtrate and accepts fibrous slurry solids of treated and non-treated DNTs.
A high molecular weight cationic polyacrylamide was fed at various 10 dosage levels in the approach loop piping to the DNT. The following data demonstrates the improvements provided with the use of a polymer. The polymer utilized in these studies was a high molecular weight linear 40/60 AETAC/acrylamide copolymer.
TABLE I
Northeast Mill Polymeric Additive to DNT
Acid Loop Polymer AccePts1 Filtrate1 % Retenlion2_ 20Dose Influent Non- Non- Non-Time Ib/ton Flow1_Treated Treated Treated Treated Treated Treated 1630 0.5 1.03 9.3 9.7 0.30 0.27 70.9 73.8 1715 1.0 1.02 9.2 12.8 0.33 0.26 67.6 74.5 1830 1.5 1.16 8.1 11.9 0.28 0.18 75.9 84.5 1930 1.5 1.29 9.3 13.1 0.28 0.14 78.3 89.1 2030 2.0 1.1210.5 13.2 0.26 0.10 76.8 91.1 2130 2.5 0.92 9.4 12.1 0.26 0.12 71.7 87.0 2230 3.0 1.04 8.9 12.6 0.26 0.12 75.0 88.5 213988~
TABLE ll Northeast Mill Polymeric Additive to DNT
Alkaline Loop Polymer AccePts1_ Filtrate1 % Retention2_ Dose Influent Non- Non- Non-Time Ib/ton Flow1_ Treated Treated Treated Treated Treated Treated 1715 1.0 1.13 10.5 9.3 0.51 0.47 54.9 58.4 1830 1.5 1.188.4 9.0 0.54 0.51 54.2 56.8 1930 1.5 1.238.8 9.2 0.57 0.54 53.7 56.1 2030 2.0 0.968.2 9.9 0.55 0.47 42.7 51.0 2130 2.5 1.0510.4 9.7 0.52 0.45 50.5 57.1 2230 3.0 1.099.1 7.9 0.56 0.50 48.6 54.1 15 1 as percent solids 2 calculated as [(influent solids - filtrate solids)/influent solids] x 100 A range of percent mole charge from about 1 to 80%, a molecular weight of polymer from about 3,000,000 to 30,000,000, and polymer dos-20 ages of from about 0.025 to 25 pounds per ton active polymer to activefurnish solids are preferred. In addition, cationic (meth)acrylamide co-polymers with the following cationic monomers are all expected to be effective:
I
[-CH2-C-]
C=0 A
(CH2)x R4--N+--R2 I
X~
wherein R1 = H or CH3; A = -NH or-O-; x = 0-8; R2, R3, R4 are each in-dependently H, CH3, C2-C8 alkyl, benzyl or C2-C8 alkyl benzyl; and X =
Cl, F, Br, I or SO4; or CH2 = CH CH = CH2 (CH2)x (CH2)x N+
/ \
~139884 wherein x= 0-8; R1 = H, CH3, C2-C8 alkyl, benzyl or C2-C8 alkyl benzyl;
andX=CI, F, Br, lorSO4.
Examples of specific cationic monomers are as follows:
AETAC - 2-acryloyloxyethyltrimethyl ammonium chloride METAC - 2-methacryloyloxyethyltrimethyl ammonium chloride APTAC - 3-acrylamidopropyltrimethyl ammonium chloride MAPTAC - 3-methacrylamidopropyltrimethyl ammonium chloride 10 DADMAC- diallyldimethyl ammonium chloride, and the like.
Note that the DNT operation involves substl ate feed into the inter-face of a plastic 100 to 200 mesh wire and a hardened plastic roll, typical-ly operating at a wire speed of about 3000 linear feet per minute. The 15 shear forces involved at this interface are designed to allow maximum flow of water and fine particles through the wire. These high shear forces would normally be expected to break, or reduce in size, the flocs pro-duced by addition of polymeric flocculants, and thus increase the solids loss through the DNT wire. The improvements brought about by the 20 present invention are significant in light of the severe conditions inherent in the operation.
While this invention has been described with respect to particular embodiments thereof, it is apparent that numerous other forms and modi-25 fications of this invention will be obvious to those skilled in the art. Theappended claims and this invention generally should be construed to cover all such obvious forms and modifications which are within the true spirit and scope of the present invention.
USE OF POLYMERS IN THE RECYCLED FIBER
WASHING/DEINKING PROCESS
FIELD OF THE INVENTION
The use of recycled fibers is becoming an important aspect of papermaking both for economic and environmental reasons. The basic 10 manufacturing steps in the use of recycled fiber include the repulping of recovered paper, followed by the removal of printing inks from the fibers.
A typical deinking process utilizes a combination of chemical and mechanical techniques in several stages, whereby the ink is physically 15 removed from the fiber. The accepts (or fiber) from the deinking step are then typically treated through a series of washers and cleaners, in order to further remove contaminants and improve fiber quality. A dynamic washing/thickening device, such as a double nip thickener (DNT), is one such mechanical device co"l",only utilized. This high speed washing/
20 thickening device serves to remove ink and filler particles from the fibrous slurry.
Polymeric additives are commonly utilized in the papermaking process in order to coagulate/flocculate the fiber/filler slurry, thus improv-ing dewatering or retention of fine particles. These polymeric additives may be used as retention aids, drainage aids, clarification aids, sludge 5 dewatering aids, etc., depending upon the application in which they are employed. Polymers have not been known to be employed, nor was their use successful, with a dynamic belt washer/thickener.
The present invention relates to the use of a cationic polyacryla-10 mide polymer to increase the efficiency of a dynamic washing/thickeningdevice utilized in the papermaking/deinking processes. This polymer is preferably a high molecular weight cationic flocculant.
DETAILED DESCRIPTION OF THE INVENTION
The papermaking industry continually strives to improve productiv-ity and efficiency. The present invention provides improved production by increased washer/thickener retention. This results in increased wash-er/thickener capacity and overall deink plant production capacity. An-20 other result of improved retention is a lower solids content in the wash-er/thickener filtrate. Lower filtrate solids allow for less polymer usage in the clarifier, less sludge thickening and lower landfill costs.
Field studies were conducted at a northeast newsprint deinking 25 mill, wherein old newsprint (ONP) and magazines were repulped and deinked for use in the papermaking process. The subject mill utilized alkaline and acid deinking loops, in series, in order to treat the paper stock. Both the alkaline and acid loops contained DNT washers. The accepts from the DNT were further processed as fiber for use in the papermaking process; the fiitrate was then sent to a Dissolved Air Flota-tion (DAF) clarifier for further solids removal. The respective loops em-ploy two or more Double Nip Thickeners (DNTs) in parallel, thus the influ-5 ent flow is identical for the DNTs in a specific loop. This system permitsevaluation of polymeric additives by comparing the filtrate and accepts fibrous slurry solids of treated and non-treated DNTs.
A high molecular weight cationic polyacrylamide was fed at various 10 dosage levels in the approach loop piping to the DNT. The following data demonstrates the improvements provided with the use of a polymer. The polymer utilized in these studies was a high molecular weight linear 40/60 AETAC/acrylamide copolymer.
TABLE I
Northeast Mill Polymeric Additive to DNT
Acid Loop Polymer AccePts1 Filtrate1 % Retenlion2_ 20Dose Influent Non- Non- Non-Time Ib/ton Flow1_Treated Treated Treated Treated Treated Treated 1630 0.5 1.03 9.3 9.7 0.30 0.27 70.9 73.8 1715 1.0 1.02 9.2 12.8 0.33 0.26 67.6 74.5 1830 1.5 1.16 8.1 11.9 0.28 0.18 75.9 84.5 1930 1.5 1.29 9.3 13.1 0.28 0.14 78.3 89.1 2030 2.0 1.1210.5 13.2 0.26 0.10 76.8 91.1 2130 2.5 0.92 9.4 12.1 0.26 0.12 71.7 87.0 2230 3.0 1.04 8.9 12.6 0.26 0.12 75.0 88.5 213988~
TABLE ll Northeast Mill Polymeric Additive to DNT
Alkaline Loop Polymer AccePts1_ Filtrate1 % Retention2_ Dose Influent Non- Non- Non-Time Ib/ton Flow1_ Treated Treated Treated Treated Treated Treated 1715 1.0 1.13 10.5 9.3 0.51 0.47 54.9 58.4 1830 1.5 1.188.4 9.0 0.54 0.51 54.2 56.8 1930 1.5 1.238.8 9.2 0.57 0.54 53.7 56.1 2030 2.0 0.968.2 9.9 0.55 0.47 42.7 51.0 2130 2.5 1.0510.4 9.7 0.52 0.45 50.5 57.1 2230 3.0 1.099.1 7.9 0.56 0.50 48.6 54.1 15 1 as percent solids 2 calculated as [(influent solids - filtrate solids)/influent solids] x 100 A range of percent mole charge from about 1 to 80%, a molecular weight of polymer from about 3,000,000 to 30,000,000, and polymer dos-20 ages of from about 0.025 to 25 pounds per ton active polymer to activefurnish solids are preferred. In addition, cationic (meth)acrylamide co-polymers with the following cationic monomers are all expected to be effective:
I
[-CH2-C-]
C=0 A
(CH2)x R4--N+--R2 I
X~
wherein R1 = H or CH3; A = -NH or-O-; x = 0-8; R2, R3, R4 are each in-dependently H, CH3, C2-C8 alkyl, benzyl or C2-C8 alkyl benzyl; and X =
Cl, F, Br, I or SO4; or CH2 = CH CH = CH2 (CH2)x (CH2)x N+
/ \
~139884 wherein x= 0-8; R1 = H, CH3, C2-C8 alkyl, benzyl or C2-C8 alkyl benzyl;
andX=CI, F, Br, lorSO4.
Examples of specific cationic monomers are as follows:
AETAC - 2-acryloyloxyethyltrimethyl ammonium chloride METAC - 2-methacryloyloxyethyltrimethyl ammonium chloride APTAC - 3-acrylamidopropyltrimethyl ammonium chloride MAPTAC - 3-methacrylamidopropyltrimethyl ammonium chloride 10 DADMAC- diallyldimethyl ammonium chloride, and the like.
Note that the DNT operation involves substl ate feed into the inter-face of a plastic 100 to 200 mesh wire and a hardened plastic roll, typical-ly operating at a wire speed of about 3000 linear feet per minute. The 15 shear forces involved at this interface are designed to allow maximum flow of water and fine particles through the wire. These high shear forces would normally be expected to break, or reduce in size, the flocs pro-duced by addition of polymeric flocculants, and thus increase the solids loss through the DNT wire. The improvements brought about by the 20 present invention are significant in light of the severe conditions inherent in the operation.
While this invention has been described with respect to particular embodiments thereof, it is apparent that numerous other forms and modi-25 fications of this invention will be obvious to those skilled in the art. Theappended claims and this invention generally should be construed to cover all such obvious forms and modifications which are within the true spirit and scope of the present invention.
Claims (9)
1. A method for increasing the retention of solids on a washing and thickening device in an aqueous papermaking system which com-prises adding to the furnish solids of said system an amount, effective for the purpose, of a cationic polyacrylamide polymer.
2. The method as recited in claim 1 wherein from about 0.025 to 25 pounds of active polymer per ton of furnish solids is added to the aqueous papermaking system.
3. The method as recited in claim 1 wherein the cationic poly-acrylamide polymer is a cationic (meth)acrylamide copolymer.
4. The method as recited in claim 3 wherein the cationic (meth)acrylamide copolymer comprises as a substituent a monomer:
wherein R1 = H or CH3; A = -NH or -O-; x = 0-8; R2, R3, R4 are each in-dependently H, CH3, C2-C8 alkyl, benzyl or C2-C8 alkyl benzyl; and X =
Cl, F, Br, I or SO4.
wherein R1 = H or CH3; A = -NH or -O-; x = 0-8; R2, R3, R4 are each in-dependently H, CH3, C2-C8 alkyl, benzyl or C2-C8 alkyl benzyl; and X =
Cl, F, Br, I or SO4.
5. The method as recited in claim 3 wherein the cationic (meth)acrylamide copolymer comprises as a substituent a monomer:
wherein x= 0-8; R1 = H, CH3, C2-C8 alkyl, benzyl or C2-C8 alkyl benzyl;
andX=CI, F, Br, 1 or SO4.
wherein x= 0-8; R1 = H, CH3, C2-C8 alkyl, benzyl or C2-C8 alkyl benzyl;
andX=CI, F, Br, 1 or SO4.
6. The method as recited in claim 3 wherein said washing and thickening device is a double nip thickener.
7. The method as recited in claim 1 wherein said cationic poly-acrylamide polymer has a molecular weight of from about 3,000,000 to 30,000,000.
8. The method as recited in claim 1 wherein said cationic poly-acrylamide polymer has a percent mole charge of from about 1 to 80%.
9. The method as recited in claim 1 wherein said cationic poly-acrylamide polymer is a 2-acryloyloxyethyltrimethyl ammonium chloride/
acrylamide copolymer.
acrylamide copolymer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US307,969 | 1994-09-16 | ||
| US08/307,969 US5626718A (en) | 1994-09-16 | 1994-09-16 | Use of polymers in the recycled fiber washing/deinking process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2139884A1 true CA2139884A1 (en) | 1996-03-17 |
Family
ID=23191959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2139884 Abandoned CA2139884A1 (en) | 1994-09-16 | 1995-01-10 | Use of polymers in the recycled fiber washing/deinking process |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US5626718A (en) |
| CA (1) | CA2139884A1 (en) |
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| US6019904A (en) * | 1996-11-01 | 2000-02-01 | Nalco Chemical Company | Hydrophilic dispersion polymers of diallyldimethyl ammonium chloride and acrylamide for the clarification of deinking process waters |
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| US6001218A (en) | 1994-06-29 | 1999-12-14 | Kimberly-Clark Worldwide, Inc. | Production of soft paper products from old newspaper |
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| US6296736B1 (en) | 1997-10-30 | 2001-10-02 | Kimberly-Clark Worldwide, Inc. | Process for modifying pulp from recycled newspapers |
| US6045551A (en) | 1998-02-06 | 2000-04-04 | Bonutti; Peter M. | Bone suture |
| US6387210B1 (en) | 1998-09-30 | 2002-05-14 | Kimberly-Clark Worldwide, Inc. | Method of making sanitary paper product from coarse fibers |
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-
1994
- 1994-09-16 US US08/307,969 patent/US5626718A/en not_active Expired - Fee Related
-
1995
- 1995-01-10 CA CA 2139884 patent/CA2139884A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0821099A1 (en) * | 1996-07-22 | 1998-01-28 | Nalco Chemical Company | Use of hydrophilic dispersion polymers for coated broke treatment |
| US6019904A (en) * | 1996-11-01 | 2000-02-01 | Nalco Chemical Company | Hydrophilic dispersion polymers of diallyldimethyl ammonium chloride and acrylamide for the clarification of deinking process waters |
Also Published As
| Publication number | Publication date |
|---|---|
| US5626718A (en) | 1997-05-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |