CA2208782A1 - Process and composition for deinking waste paper - Google Patents
Process and composition for deinking waste paperInfo
- Publication number
- CA2208782A1 CA2208782A1 CA 2208782 CA2208782A CA2208782A1 CA 2208782 A1 CA2208782 A1 CA 2208782A1 CA 2208782 CA2208782 CA 2208782 CA 2208782 A CA2208782 A CA 2208782A CA 2208782 A1 CA2208782 A1 CA 2208782A1
- Authority
- CA
- Canada
- Prior art keywords
- surfactant
- process according
- deinking
- treatment
- pulp
- 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
- 239000002761 deinking Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000000203 mixture Substances 0.000 title claims abstract description 19
- 230000008569 process Effects 0.000 title claims abstract description 18
- 239000010893 paper waste Substances 0.000 title claims abstract description 10
- 238000011282 treatment Methods 0.000 claims abstract description 16
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000004094 surface-active agent Substances 0.000 claims abstract description 10
- 239000002245 particle Substances 0.000 claims abstract description 8
- 230000002776 aggregation Effects 0.000 claims abstract description 6
- 238000004220 aggregation Methods 0.000 claims abstract description 6
- 238000005187 foaming Methods 0.000 claims abstract description 6
- 238000000280 densification Methods 0.000 claims abstract description 5
- 125000002947 alkylene group Chemical group 0.000 claims abstract description 4
- 230000001737 promoting effect Effects 0.000 claims abstract description 4
- 239000000835 fiber Substances 0.000 claims description 17
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims description 7
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 claims description 6
- 239000012736 aqueous medium Substances 0.000 claims description 4
- 150000003333 secondary alcohols Chemical class 0.000 claims description 4
- 238000007046 ethoxylation reaction Methods 0.000 claims description 3
- 239000002609 medium Substances 0.000 claims description 2
- 125000003396 thiol group Chemical class [H]S* 0.000 claims 2
- 230000002708 enhancing effect Effects 0.000 claims 1
- 239000002002 slurry Substances 0.000 abstract description 4
- 239000000976 ink Substances 0.000 description 24
- 238000005188 flotation Methods 0.000 description 17
- 239000002699 waste material Substances 0.000 description 11
- 150000003573 thiols Chemical class 0.000 description 7
- 238000009472 formulation Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 238000007639 printing Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 125000006353 oxyethylene group Chemical group 0.000 description 2
- 238000004537 pulping Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 101100117236 Drosophila melanogaster speck gene Proteins 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229940000425 combination drug Drugs 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000011020 pilot scale process Methods 0.000 description 1
- 239000013055 pulp slurry Substances 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
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
- 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
- D21C5/027—Chemicals therefor
-
- 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
A process and composition for deinking waste paper is disclosed. The process comprises administering an alcohol, randomly alkoxylated with a mixture of alkylene oxides to form a surfactant, to a sample of waste paper for which treatment is desired. The surfactant enhances the aggregation and densification of electrostatic toner particles, while promoting foaming in the aqueous slurry.
Description
CA 02208782 l997-06-20 W O96/35014 PCT~US96/0~76 PROCESS AND COMPOSITION FOR
DEINKING WASTE PAPER
TECHNICAL FIELD
The present invention deals with a process and composition for deinking waste paper. The lledLIIIelll enhances the aggr~:ydlion and densification of elect(osldlic toner particles, while promoting foaming in the aqueous slurry.
BACKGROUND OF THE ART
Dry toner electrostatic printing inks, including laser and xerograph-ic inks, are important and growing contaminants in the area of waste-10 paper recycling. Traditionally, paper has been printed with water or oil-based inks which were adequately removed by conventional deinking procedures. In these methods, secondary fiber is mechanically pulped and contacted with an aqueous medium containing a su, racLa, ll. Ink is separated from pulp fibers as a result of mechanical pulping and the 15 action of the su, racl~l IL. The dispersed ink is separated from pulp fibers by such means as washing or flotation.
W O96/35014 PCT~US96105576 Conventional deinking processes have shown minimal sl ~ccess in dealing with dry toner elect, oslalic printing inks with the necessar!y chemical and mechanical treatments of the furnish proving to be time consuming and often rendering a furnish which is unacceptable for many 5 applications. The develo,c"lenl of a deinking proy,ar" for office waste cGnla",inated with elec;~,oslalic printed copy will make this furnish more amenable to the recycling process.
The ability to recycle office waste will prove commercially advan-- 10 tageous and will have a significant impact on the CGI Isel ~ation of virgin fiber resources. Although electrostatic printed waste has not reached the volume of impact printed waste commonly seen in the industry indica-tions are such that usage of elec~ osl~lic print is increasing steadily and that waste copies available to the recycling industry will also increase.
Some deinking systems employ chemical aggregation/densifica-tion followed by forward cleaning to remove non-impact inks and flotation deinking to remove impact inks (i e offset) and other conla",inants. The chemical nature of many of these deinking products has caused them to 20 act as defoamers in aqueous papermaking systems. A separate flotation aid is thus often added to the flotation cell in order to overcome the de-foaming effect of the earlier chemicals.
Furthermore many aggregationldensification systems use rela-25 tively high application dosages in order to provide effective treatment.Existing office waste deinking technology utilizes product dosages of 0.60% - 0.75% on fiber to aggregate and densify the toner particles.
W Og6/35014 PC~r~S9610S576 BRIEF DESCRIPTION OF DRAWINGS
~, Figure 1 illuslrales a standard deinking sequence.
The present invention provides a process for the deinking of waste-paper containing electfc,s~alic printed ink, impact printed ink, or combina-tions thereof, which comprises adding to an aqueous slurry of the waste-10 paper a compound which enhances the aggregalion and densification ofeleclrostalic toner particles, while promoting foaming in said aqueous slurry. A prefer, ed class of compounds are the random alcohol alkoxy-lates, with a randon, linear alcohol alkoxylate sl~rac~al)t being particularly preferred, although branched forms of these cG",pounds are also antici-15 pated to be effective. This substance has the following structure:
CH3-(CH2)x-~-(CH2CH2~)y~(CH2CH(CH3)~)zH
11 <x<14 molecular weight _ 800 particularly prererred.
The process of the present invention incl~ ~des the following steps:
wastepaper stocks containing electrostatic printed ink, impact printed ink, 25 or combi"dliG"s thereof are converted to a pulp. The pulp is then con-tacted with an aqueous medium containing a treatment co",~, isi"y a ran-dom alcohol alkoxylate su, rac~anl, e.g., with ethylene oxide and propyl-ene oxide groups, and a thiol ethoxylate surractanl, the latter prererably CA 02208782 l997-06-20 W O 96/35014 PCT~US96/05576 with a degree of ethoxylation of up to 3 moles of ethylene oxide. The resulting pulp-containing medium is then mechanically processed to remove treated ink therer,om.
The molecular weight range of the ra"dG", linear alcohol alkoxy-late surfactant is prererably from 600-1000; the temperature of treatment may be from 1 30~F-1 80~F with a pH of from 5.0 to 12.0 preferred.
F~.,ll,er",ore the random alcohol alkoxylate surfactant possesses an aqueous cloud point of 1 5-25~C.
By random alcohol alkoxylate it is meant an alcohol rai,doi"ly alkoxylated with a mixture of alkylene oxides (e.g. ethylene oxide and propylene oxide) as described below.
Conventional blocked alkoxylates have all of the oxyethylene monomers congruent to each other on the chain. All of the oxypropylene monomers follow ro""ing a cap. Molecules of this type which are effec-tive for office waste deinking are typically water-insoluble and act as de-foamers. Random alkoxylates react ethylene oxide and propylene oxide at the same time with the alcohol hydrophobe. A rando",ized distribution of the oxyethylene and oxypropylene monomers is therefore obtained.
These compounds have been found to be efficient agents to aggregate and densify non-impact inks while remaining water soluble.
t An ;III,~)GI lan l improvement over previous treatment approaches is the foaming potential of the formulations which allows for the complete elimination of a separale flotation deinking agent. The result is that an effective aggregation/densirica~ion agent for electrostatic printing inks may also act as a flotation aid.
WO 9G/35014 PCT~JS96/0~i7C
In addition, enhanced treatment efficiencies are obtained at lower product dosages as compared to previous tre~l",e,~ts. The stock is de-inked at a product dos~ge of 0.30 weight % on fiber, as cGmpared to 0.60-0.75% on fiber with previous treatments (weight percent is based on 5 dry fiber in pulper).
ExamPles ExamPle 1 A dose of 0.30% on fiber of a formulation containing a random linear alcohoi alkoxyiate, a thiol ethoxylate and a seconda, ~ alcohol ethoxylate (the latter with an HLB ~ 10) were added to a pilot-scale hydrapulper containing 200 pounds of sorted office waste and 200 gallons of water, which had been heated to 1 50~F and adjusted to a pH of 11 with sodium 15 hydroxide. The mixture was pulped for 45 minutes. After pulping, it was diluted and processed through a standard deinking sequence,-shown in Figure 1.
Deinking system pe,rorn,ance in removing the non-impact inks was 20 evaluated by dirt count. Results are found in Table 1. These results were achieved at a 50% cl,emical dose basis as cG,npared to existing office waste deinking cl ,emisl, ~ added to the hydrapulper. For cor"parison, re-sults obtained with conventional office waste deinking chemistry are also found in Table 1. Also, a further process simplification was realized, by 25 eliminatin~ the 0.40% on fiber of flotation aid dosaye, which typically is added prior to flotation in order to achieve surricie"l frothing for impact ink removal. It is worthy to note that both processes removed over 99%
W O96/35014 PCTrUS96/05576 of the visible dirt due to the non-impact inks. However, the present in-vention did so at a sl ~bstantially lower treatment dosage and without the use of an additional flotation aid.
The removal of dispersed impact inks with the present invention was evaluated by brightness measurement on pulp pads. Most dispersed inks will be removed by flotation and washing so long as the correct treat-ment is carried out. Flotation feed stock had a brightness of 55.0%; flota-tion deinking raised the brightness to 56.8%. The flotation froth rejects had a brightness of 47.1%, indicating significant dispersed ink removal in the flotation cell without the addition of a separ~le flotation aid. Washing across a high speed belt washer raised the stock brightness to 63.8%.
TABLE I
Treatment PulPer Chemistrv A B
Pulper Dosage (% on Fiber) 0.30 0.75 Separate Flotation Aid (fatty acid ethoxylate) No Yes Flotation Dosage (% on Fiber) 0 0.40 Pulper Dirt Count (ppm) 873 578 Deinked DirtCount (ppm) 4 5 - Dirt Reduction - Pulper to Washer (%) 99.5% 99.1 %Pulper Speck Count (no./sq.m.) 12,155 7,555 Deinked Speck Count (no./sq.m.) 100 100 Speck Reduction - Pulper to Washer (%) 99.2% 98.7%
A: Blend of (a) ranclo"~ linear alcohol alkoxylate, (b) thiol ethoxylate and (c) secondary alcohol ethoxylate in a ratio of (a):(b):(c) of 7:1:2.
Thiol ethoxylate may have a hydrophile-lipophile balance (HLB) of from 2~.
B: Commercial deinking product - see U.S. Patent 5,141,598.
W O96/35014 ~CTnUS96)~5576 ExamPle 2 A number of different formulations were tested which contained varying conce, Ill alions of thiol ethoxylates and randG", alcohol alkoxy-lates. These were dosed individually to 18 9 benchtop hydrapulpers con-5 taining sorted office waste at ~los~ges of 0.2% and 0.4% on dry fiber.
This was compared to conventional tredl",e"~s dosed at the same levels.
Pulpers were run for 45 minutes at 150~F a pH of 11 and a 6%
consistency (concer,l,2lion of fiber in pulper i.e. 6 Ibs. fiber/100 Ibs. of pulp slurry).
Results are contained in Table ll. As shown the formulations of the pres~nt invention produced enhanced ink particle aggregation (a lower peroenlage of small ink particles) and higher ink particle density values than an equal dosage of conventional treatments.
TABLE ll Dose Aggregation Mean Density Formulation % on Fiber% area < 0.03 sq.mm. (q/cc) A 0.2 23.6 1.022 B 0.2 14.4 1.035 C 0.2 7.4 1.046 D 0.2 10.1 1.048 E 0.2 20.2 1.040 A 0.4 18.0 1.028 B 0.4 10.7 1.132 C 0.4 7.0 1.126 ~ D 0.4 8.5 1.060 E 0.4 6.6 1.164 .
30 A: Co~r""ercial deinking product - see U.S. Patent 5 141 598.
~j W O96/35014 PCTnUS96/05576 B - E: Blends of (a) random linear alcohol alkoxylate, (b) thiol ethoxylate and (c) secondary alcohol ethoxylate, in ratio of (a):(b):(c) of B: 4:0:3, with remainder as triethylene glycol C: 2:2:3, with remainder as triethylene glycol D: 3:3:1, with remainder as triethylene glycol E: 7:1.5:1.5 (thiol ethoxylate may have an HLB from 2~; secondary alcohol ethoxylate HLB< 10).
DEINKING WASTE PAPER
TECHNICAL FIELD
The present invention deals with a process and composition for deinking waste paper. The lledLIIIelll enhances the aggr~:ydlion and densification of elect(osldlic toner particles, while promoting foaming in the aqueous slurry.
BACKGROUND OF THE ART
Dry toner electrostatic printing inks, including laser and xerograph-ic inks, are important and growing contaminants in the area of waste-10 paper recycling. Traditionally, paper has been printed with water or oil-based inks which were adequately removed by conventional deinking procedures. In these methods, secondary fiber is mechanically pulped and contacted with an aqueous medium containing a su, racLa, ll. Ink is separated from pulp fibers as a result of mechanical pulping and the 15 action of the su, racl~l IL. The dispersed ink is separated from pulp fibers by such means as washing or flotation.
W O96/35014 PCT~US96105576 Conventional deinking processes have shown minimal sl ~ccess in dealing with dry toner elect, oslalic printing inks with the necessar!y chemical and mechanical treatments of the furnish proving to be time consuming and often rendering a furnish which is unacceptable for many 5 applications. The develo,c"lenl of a deinking proy,ar" for office waste cGnla",inated with elec;~,oslalic printed copy will make this furnish more amenable to the recycling process.
The ability to recycle office waste will prove commercially advan-- 10 tageous and will have a significant impact on the CGI Isel ~ation of virgin fiber resources. Although electrostatic printed waste has not reached the volume of impact printed waste commonly seen in the industry indica-tions are such that usage of elec~ osl~lic print is increasing steadily and that waste copies available to the recycling industry will also increase.
Some deinking systems employ chemical aggregation/densifica-tion followed by forward cleaning to remove non-impact inks and flotation deinking to remove impact inks (i e offset) and other conla",inants. The chemical nature of many of these deinking products has caused them to 20 act as defoamers in aqueous papermaking systems. A separate flotation aid is thus often added to the flotation cell in order to overcome the de-foaming effect of the earlier chemicals.
Furthermore many aggregationldensification systems use rela-25 tively high application dosages in order to provide effective treatment.Existing office waste deinking technology utilizes product dosages of 0.60% - 0.75% on fiber to aggregate and densify the toner particles.
W Og6/35014 PC~r~S9610S576 BRIEF DESCRIPTION OF DRAWINGS
~, Figure 1 illuslrales a standard deinking sequence.
The present invention provides a process for the deinking of waste-paper containing electfc,s~alic printed ink, impact printed ink, or combina-tions thereof, which comprises adding to an aqueous slurry of the waste-10 paper a compound which enhances the aggregalion and densification ofeleclrostalic toner particles, while promoting foaming in said aqueous slurry. A prefer, ed class of compounds are the random alcohol alkoxy-lates, with a randon, linear alcohol alkoxylate sl~rac~al)t being particularly preferred, although branched forms of these cG",pounds are also antici-15 pated to be effective. This substance has the following structure:
CH3-(CH2)x-~-(CH2CH2~)y~(CH2CH(CH3)~)zH
11 <x<14 molecular weight _ 800 particularly prererred.
The process of the present invention incl~ ~des the following steps:
wastepaper stocks containing electrostatic printed ink, impact printed ink, 25 or combi"dliG"s thereof are converted to a pulp. The pulp is then con-tacted with an aqueous medium containing a treatment co",~, isi"y a ran-dom alcohol alkoxylate su, rac~anl, e.g., with ethylene oxide and propyl-ene oxide groups, and a thiol ethoxylate surractanl, the latter prererably CA 02208782 l997-06-20 W O 96/35014 PCT~US96/05576 with a degree of ethoxylation of up to 3 moles of ethylene oxide. The resulting pulp-containing medium is then mechanically processed to remove treated ink therer,om.
The molecular weight range of the ra"dG", linear alcohol alkoxy-late surfactant is prererably from 600-1000; the temperature of treatment may be from 1 30~F-1 80~F with a pH of from 5.0 to 12.0 preferred.
F~.,ll,er",ore the random alcohol alkoxylate surfactant possesses an aqueous cloud point of 1 5-25~C.
By random alcohol alkoxylate it is meant an alcohol rai,doi"ly alkoxylated with a mixture of alkylene oxides (e.g. ethylene oxide and propylene oxide) as described below.
Conventional blocked alkoxylates have all of the oxyethylene monomers congruent to each other on the chain. All of the oxypropylene monomers follow ro""ing a cap. Molecules of this type which are effec-tive for office waste deinking are typically water-insoluble and act as de-foamers. Random alkoxylates react ethylene oxide and propylene oxide at the same time with the alcohol hydrophobe. A rando",ized distribution of the oxyethylene and oxypropylene monomers is therefore obtained.
These compounds have been found to be efficient agents to aggregate and densify non-impact inks while remaining water soluble.
t An ;III,~)GI lan l improvement over previous treatment approaches is the foaming potential of the formulations which allows for the complete elimination of a separale flotation deinking agent. The result is that an effective aggregation/densirica~ion agent for electrostatic printing inks may also act as a flotation aid.
WO 9G/35014 PCT~JS96/0~i7C
In addition, enhanced treatment efficiencies are obtained at lower product dosages as compared to previous tre~l",e,~ts. The stock is de-inked at a product dos~ge of 0.30 weight % on fiber, as cGmpared to 0.60-0.75% on fiber with previous treatments (weight percent is based on 5 dry fiber in pulper).
ExamPles ExamPle 1 A dose of 0.30% on fiber of a formulation containing a random linear alcohoi alkoxyiate, a thiol ethoxylate and a seconda, ~ alcohol ethoxylate (the latter with an HLB ~ 10) were added to a pilot-scale hydrapulper containing 200 pounds of sorted office waste and 200 gallons of water, which had been heated to 1 50~F and adjusted to a pH of 11 with sodium 15 hydroxide. The mixture was pulped for 45 minutes. After pulping, it was diluted and processed through a standard deinking sequence,-shown in Figure 1.
Deinking system pe,rorn,ance in removing the non-impact inks was 20 evaluated by dirt count. Results are found in Table 1. These results were achieved at a 50% cl,emical dose basis as cG,npared to existing office waste deinking cl ,emisl, ~ added to the hydrapulper. For cor"parison, re-sults obtained with conventional office waste deinking chemistry are also found in Table 1. Also, a further process simplification was realized, by 25 eliminatin~ the 0.40% on fiber of flotation aid dosaye, which typically is added prior to flotation in order to achieve surricie"l frothing for impact ink removal. It is worthy to note that both processes removed over 99%
W O96/35014 PCTrUS96/05576 of the visible dirt due to the non-impact inks. However, the present in-vention did so at a sl ~bstantially lower treatment dosage and without the use of an additional flotation aid.
The removal of dispersed impact inks with the present invention was evaluated by brightness measurement on pulp pads. Most dispersed inks will be removed by flotation and washing so long as the correct treat-ment is carried out. Flotation feed stock had a brightness of 55.0%; flota-tion deinking raised the brightness to 56.8%. The flotation froth rejects had a brightness of 47.1%, indicating significant dispersed ink removal in the flotation cell without the addition of a separ~le flotation aid. Washing across a high speed belt washer raised the stock brightness to 63.8%.
TABLE I
Treatment PulPer Chemistrv A B
Pulper Dosage (% on Fiber) 0.30 0.75 Separate Flotation Aid (fatty acid ethoxylate) No Yes Flotation Dosage (% on Fiber) 0 0.40 Pulper Dirt Count (ppm) 873 578 Deinked DirtCount (ppm) 4 5 - Dirt Reduction - Pulper to Washer (%) 99.5% 99.1 %Pulper Speck Count (no./sq.m.) 12,155 7,555 Deinked Speck Count (no./sq.m.) 100 100 Speck Reduction - Pulper to Washer (%) 99.2% 98.7%
A: Blend of (a) ranclo"~ linear alcohol alkoxylate, (b) thiol ethoxylate and (c) secondary alcohol ethoxylate in a ratio of (a):(b):(c) of 7:1:2.
Thiol ethoxylate may have a hydrophile-lipophile balance (HLB) of from 2~.
B: Commercial deinking product - see U.S. Patent 5,141,598.
W O96/35014 ~CTnUS96)~5576 ExamPle 2 A number of different formulations were tested which contained varying conce, Ill alions of thiol ethoxylates and randG", alcohol alkoxy-lates. These were dosed individually to 18 9 benchtop hydrapulpers con-5 taining sorted office waste at ~los~ges of 0.2% and 0.4% on dry fiber.
This was compared to conventional tredl",e"~s dosed at the same levels.
Pulpers were run for 45 minutes at 150~F a pH of 11 and a 6%
consistency (concer,l,2lion of fiber in pulper i.e. 6 Ibs. fiber/100 Ibs. of pulp slurry).
Results are contained in Table ll. As shown the formulations of the pres~nt invention produced enhanced ink particle aggregation (a lower peroenlage of small ink particles) and higher ink particle density values than an equal dosage of conventional treatments.
TABLE ll Dose Aggregation Mean Density Formulation % on Fiber% area < 0.03 sq.mm. (q/cc) A 0.2 23.6 1.022 B 0.2 14.4 1.035 C 0.2 7.4 1.046 D 0.2 10.1 1.048 E 0.2 20.2 1.040 A 0.4 18.0 1.028 B 0.4 10.7 1.132 C 0.4 7.0 1.126 ~ D 0.4 8.5 1.060 E 0.4 6.6 1.164 .
30 A: Co~r""ercial deinking product - see U.S. Patent 5 141 598.
~j W O96/35014 PCTnUS96/05576 B - E: Blends of (a) random linear alcohol alkoxylate, (b) thiol ethoxylate and (c) secondary alcohol ethoxylate, in ratio of (a):(b):(c) of B: 4:0:3, with remainder as triethylene glycol C: 2:2:3, with remainder as triethylene glycol D: 3:3:1, with remainder as triethylene glycol E: 7:1.5:1.5 (thiol ethoxylate may have an HLB from 2~; secondary alcohol ethoxylate HLB< 10).
Claims (10)
1. A process for the deinking of wastepaper stocks containing electrostatic printed ink, impact printed ink, or combinations thereof, which comprises the following steps:
(a) converting the wastepaper to a pulp;
(b) contacting the pulp with an aqueous medium containing a treatment comprising an alcohol randomly alkoxylated with a mixture of alkylene oxides to form a surfactant, the treatment enhancing the aggregation and densification of electrostatic toner particles, while promoting foaming in the aqueous medium; and (c) mechanically processing the resulting pulp-containing medium to remove treated ink therefrom.
(a) converting the wastepaper to a pulp;
(b) contacting the pulp with an aqueous medium containing a treatment comprising an alcohol randomly alkoxylated with a mixture of alkylene oxides to form a surfactant, the treatment enhancing the aggregation and densification of electrostatic toner particles, while promoting foaming in the aqueous medium; and (c) mechanically processing the resulting pulp-containing medium to remove treated ink therefrom.
2. A process according to claim 1, wherein the surfactant contains ethylene oxide and propylene oxide subunits.
3. A process according to claim 2, wherein the surfactant has a molecular weight of from 600-1000.
4. A process according to claim 1, wherein the temperature is from 130°F - 180°F.
5. A process according to claim 1, wherein the pH is from 5.0 to 12Ø
6. A process according to claim 1, wherein the treatment further comprises a thiol ethoxylate surfactant with a degree of ethoxylation of up to 3 moles of ethylene oxide.
7. A process according to claim 1, wherein from 0.2 - 0.4 weight percent of the treatment, based on dry fiber, is contacted with the pulp.
8. A composition for the deinking of wastepaper containing electrostatic printed ink, impact printed ink or combinations thereof, which comprises a combination of (a) an alcohol randomly alkoxylated with a mixture of alkylene oxides to form a surfactant and (b) a thiol ethoxylate surfactant with a degree of ethoxylation of up to 3 moles of ethylene oxide.
9. A composition according to claim 8, wherein (a) has a molecular weight of from 600-1000.
10. A composition according to claim 8, further comprising a secondary alcohol alkoxylate with an HLB of up to 10.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/432,738 | 1995-05-02 | ||
| US08/432,738 US5660683A (en) | 1995-05-02 | 1995-05-02 | Process for deinking waste paper using a mixture of thiol ethoxylate and alcohol alkoxylates |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2208782A1 true CA2208782A1 (en) | 1996-11-07 |
Family
ID=23717407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2208782 Abandoned CA2208782A1 (en) | 1995-05-02 | 1996-04-19 | Process and composition for deinking waste paper |
Country Status (13)
| Country | Link |
|---|---|
| US (1) | US5660683A (en) |
| EP (1) | EP0823949B1 (en) |
| JP (1) | JPH11504992A (en) |
| KR (1) | KR19980701977A (en) |
| AT (1) | ATE198084T1 (en) |
| AU (1) | AU700347B2 (en) |
| CA (1) | CA2208782A1 (en) |
| DE (1) | DE69611236T2 (en) |
| DK (1) | DK0823949T3 (en) |
| ES (1) | ES2152525T3 (en) |
| NO (1) | NO974980D0 (en) |
| TW (1) | TW334486B (en) |
| WO (1) | WO1996035014A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6562194B1 (en) * | 2000-03-30 | 2003-05-13 | Calgon Corporation | Method of creping paper webs |
| JP4233867B2 (en) * | 2000-08-07 | 2009-03-04 | 花王株式会社 | Flotation deinking method |
| JP2002069876A (en) * | 2000-08-22 | 2002-03-08 | Nippon Paper Industries Co Ltd | Method for deinking waste paper |
| JP4604962B2 (en) * | 2005-10-28 | 2011-01-05 | 王子製紙株式会社 | Method for producing high whiteness deinked pulp |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4618400A (en) * | 1984-12-28 | 1986-10-21 | Shell Oil Company | Wastepaper deinking process |
| JPS61186592A (en) * | 1985-02-13 | 1986-08-20 | 栗田工業株式会社 | Deinking agent |
| US5024821A (en) * | 1990-02-28 | 1991-06-18 | Ici Americas Inc. | Solvent extraction process |
| FI913447A (en) * | 1990-12-28 | 1992-06-29 | Kao Corp | DEINKINGSFOERFARANDE OCH DEINKINGSSAMMANSAETTNING. |
| US5200034A (en) * | 1991-04-25 | 1993-04-06 | Betz Paperchem, Inc. | Use of surfactants having an HLB less than 10 in the deinking of dry toner electrostatic printed wastepaper |
| US5248388A (en) * | 1991-04-25 | 1993-09-28 | Betz Paperchem, Inc. | Use of surfactants having an HLB less than 10 in the deinking of dry toner electrostatic printed wastepaper |
| US5417808A (en) * | 1991-08-30 | 1995-05-23 | Lion Corporation | Deinking composition for flotation and deinking method |
| US5417807A (en) * | 1993-05-27 | 1995-05-23 | Kao Corporation | Deinking formulation for flexographic inks |
-
1995
- 1995-05-02 US US08/432,738 patent/US5660683A/en not_active Expired - Fee Related
-
1996
- 1996-02-29 TW TW085102400A patent/TW334486B/en active
- 1996-04-19 EP EP19960913817 patent/EP0823949B1/en not_active Expired - Lifetime
- 1996-04-19 AU AU56661/96A patent/AU700347B2/en not_active Ceased
- 1996-04-19 AT AT96913817T patent/ATE198084T1/en active
- 1996-04-19 WO PCT/US1996/005576 patent/WO1996035014A1/en not_active Application Discontinuation
- 1996-04-19 CA CA 2208782 patent/CA2208782A1/en not_active Abandoned
- 1996-04-19 KR KR1019970705374A patent/KR19980701977A/en not_active Application Discontinuation
- 1996-04-19 DK DK96913817T patent/DK0823949T3/en active
- 1996-04-19 ES ES96913817T patent/ES2152525T3/en not_active Expired - Lifetime
- 1996-04-19 DE DE1996611236 patent/DE69611236T2/en not_active Expired - Fee Related
- 1996-04-19 JP JP53334296A patent/JPH11504992A/en active Pending
-
1997
- 1997-10-29 NO NO974980A patent/NO974980D0/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| DE69611236T2 (en) | 2001-05-23 |
| EP0823949A1 (en) | 1998-02-18 |
| WO1996035014A1 (en) | 1996-11-07 |
| TW334486B (en) | 1998-06-21 |
| US5660683A (en) | 1997-08-26 |
| DK0823949T3 (en) | 2001-01-02 |
| ATE198084T1 (en) | 2000-12-15 |
| NO974980L (en) | 1997-10-29 |
| AU5666196A (en) | 1996-11-21 |
| NO974980D0 (en) | 1997-10-29 |
| JPH11504992A (en) | 1999-05-11 |
| EP0823949B1 (en) | 2000-12-13 |
| AU700347B2 (en) | 1999-01-07 |
| DE69611236D1 (en) | 2001-01-18 |
| ES2152525T3 (en) | 2001-02-01 |
| KR19980701977A (en) | 1998-06-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |