WO1997018348A1 - Procede d'amelioration de l'elimination des cendres dans un processus de desencrage - Google Patents

Procede d'amelioration de l'elimination des cendres dans un processus de desencrage Download PDF

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Publication number
WO1997018348A1
WO1997018348A1 PCT/IB1996/001220 IB9601220W WO9718348A1 WO 1997018348 A1 WO1997018348 A1 WO 1997018348A1 IB 9601220 W IB9601220 W IB 9601220W WO 9718348 A1 WO9718348 A1 WO 9718348A1
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WIPO (PCT)
Prior art keywords
range
per molecule
groups per
formula
carbon number
Prior art date
Application number
PCT/IB1996/001220
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English (en)
Inventor
Jill Marie Jobbins
Original Assignee
Rhodia Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Rhodia Inc. filed Critical Rhodia Inc.
Priority to AU73291/96A priority Critical patent/AU7329196A/en
Publication of WO1997018348A1 publication Critical patent/WO1997018348A1/fr

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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
    • 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
    • D21C5/022—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

Definitions

  • the present invention relates to a process for enhancing ash removal white removing p ⁇ nting inks from substrates containing them More particularly, the invention comprises reducing ash from process fiber typically mixed office waste, when removing inks by using a flotation deinking process wherein a nonionic surfactant is utilized.
  • Typical ash reduction when using conventional chemicals in flotation deinking is approximately 20-30%. To reduce the ash level to 50% or more, the above-suggested wash stages and other post flotation procedures are required. It would be desired if a chemical agent could be utilized in combination with the deinking flotation procedure to reduce ash content to a level of 50% or less of its original value to render subsequent washing and post flotation procedures unnecessary Brief Summary of the Invention
  • a novel process for reducing ash content while demkmg ink containing waste is provided which reveals a surprising beneficial effect by utilizing nonionic surfactants du ⁇ ng the flotation deinking process
  • the novel process provides an environmentally friendly, cost effective way to both remove inks from substrate and significantly decrease the ash content of the resulting fibers
  • step (b) subjecting the slurry produced in step (a) to a flotation cell having an aqueous medium, wherein the nonionic surfactant is selected to reduce the ash content by at least fifty percent of its original amount
  • nonionic surfactant present in step (a) is an alkoxylated fatty alcohol
  • the present invention provides a novel process for reducing ash content by at least fifty percent of its original amount while using flotation processing
  • the overall process generally comprises pulping or maceration of the wastepaper and ink removal by a flotation system.
  • a screening or coarse cleaning stage or stages can be utilized to remove contaminants such as glass, stone, metal and staples
  • a centrifugal cleaning stage or stages can be utilized to remove light weight materials such as plastics.
  • Typical deinking processes are described in Fergusen. LD , "Deinking Chemistry: part 1 "
  • the first step of the invention is directed to forming a slurry by pulping paper containing inks in an aqueous medium including one or more nonionic surfactants.
  • the type of paper which may be selected for pulping includes any which may be subjected to flotation type deinking procedures. Examples of such paper include flexographically printed waste, newsprint, filled and unfilled papers and paper boards and mixed office waste, with mixed office waste being the most preferred starting material.
  • the percentage of stock in the pulper is between about 10 and about 20 percent with amounts between about 12 and about 18 being more preferred and an amount of about 16 being particularly preferred for commercial use
  • the pH of the aqueous medium of the pulper is maintained between about 4 to about 10, more preferably between about 6 to about 10, and most preferably between about 6 5 to about 10 Maintenance of the pH is accomplished by adding one or more acidic or basic agents to the pulper Agents which may be selected include any of those commonly known in the art which are capable of raising or lowering the pH to the desired range
  • Basic agents include, but are not limited to the following materials of NaOH NH 4 OH KOH Na 2 C0 3 K 2 C0 3 , and mixtures thereof
  • acidic agents include HCl H 2 S0 , HN0 3 H 3 P0 4 and mixtures thereof Particularly preferred agents are NaOH or H 2 S0 4
  • the amount of basic or acidic agent added to the pulper is that which would yield the desired pH
  • nonionic surfactants function to disperse the ink into the aqueous medium during pulping and demonstrate surprising efficiencies in reducing the ash content of the resulting product
  • Nonionic surfactants suitable for use are higher (greater than C 8 ) aliphatic alcohol alkoxylates, higher aromatic alcohol alkoxylates fatty acid amides of alkanolami ⁇ es, fatty acid amide alkoxylates, block or random copolymers of ethylene and propylene oxide, higher (greater than C 8 ) alcohol polyethylene polypropylene block or random adducts and mixtures thereof
  • Specific examples of surfactants which may be used in accordance with the present invention include the following classes of chemicals
  • R is a straight-chain or branched alkyl group having a carbon number of from auout 8 to about 22, x and x which may be the same or different, represents the number of oxyethylene groups per molecule and is in the range of from about 2 to about 25, and y and y', which may be the same or different represents the number of oxypropylene groups per molecule and is in the range of from 0 to about 10 Examples of commercially available products are sold under the InkMaster " trademark by Rh ⁇ ne-Poulenc Inc
  • R' wherein R and R' independently are H or an alkyl group which is branched or straight-chain having a carbon number of from about 8 to about 14; and x is the number of oxyethylene groups per molecule and is in the range of from about 1 to about 20. Examples of commercially available products are
  • R is a fatty alkyl group having a carbon number of from about 8 to about 20
  • Examples of commercially available products are Alkamide ® products sold by Rh ⁇ ne-Poulenc Inc ,
  • R is a fatty alkyl group having a carbon number of from about 8 to about 20, and x represents the number of oxyethylene groups per molecule and is in the range of from about 2 to about 10
  • Examples of commercially available products are Alkamide ® products sold by Rh ⁇ ne-Poulenc Inc ,
  • Rh ⁇ ne-Pouienc Inc and products having a CTFA designation of Poloxamer
  • More preferred nonionic surfactants within the above classes include
  • R is a straight- chain or branched alkyl group having a carbon number of from about 8 to 14
  • x represents the number of oxyethylene groups per molecule and is in the range of from about 3 to about 12
  • y represents the number of oxypropylene groups per molecule and is in the range of from about 1 to about 6
  • InkMasterTM 770 sold by Rh ⁇ ne-Poulenc.
  • R is a straight-chain or branched alkyl group having a carbon number of from about 16 to about 20.
  • x and x' represents the number of oxyethylene groups per molecule and is in the range of from about 4 to about 10
  • y and y' represents the number of oxypropylene groups per molecule and is in the range of from about 1 to about 5;
  • a commercial example of such a nonionic surfactant is lnkMaster l l 780 sold by Rh ⁇ ne- Poulenc ,
  • the amount of surfactant present in the aqueous medium of the pulper ranges from about 0 05 to about 3 0 percent by weight based upon the dry weight of all paper added to the pulper with amounts ranging from about 0 05 to about 0 5 percent being more preferred and amounts ranging from about 0 07 to about 0 3 percent being even more preferred
  • deinking additives added in amounts recognized by those skilled in the art
  • Such additives include, but are not limited to, bleaches, sodium silicate, chelants dispersants other than the defined nonionic surfactant, enzymes detergent builders, other detergents and the like
  • the appropriate temperature range is within the skill of an artisan Generally the range is from about 40°C to about 65°C preferably from about 45°C to about 60°C and most preferably from about 48°C to about 55°C
  • the activation period is the time needed to allow substantially all of the paper fibers in the pulp slurry to come into contact with the aqueous medium Conditions such as the degree of dilution of the pulp slurry and the utilization of agitation can effect the amount of time needed The determination of the appropriate amount of time needed is within the skill of an artisan Generally, this time period can range from about 5 to about 90, preferably from about 10 to about 60 and most preferably from about 15 to about 45 minutes
  • the slurry is transferred to a flotation cell
  • the pH of the flotation cell is maintained between about 6 to about 10 more preferably between about 7 to about 9, and most preferably between about 7 to about 8 This pH often is the pH of the slurry which is provided to the flotation cell If necessary to provide the desired pH profile, one or more of the acidic or basic agents which have been described in connection with the pulping step may be added in amounts to yield a pH in the flotation cell as defined above
  • nonionic surfactants as defined above with respect to the pulping step
  • the amount of nonionic surfactant present is that which yields the same percentages as that present in the pulping step (i e , between about 0 05 to about 3 0 percent by weight of the paper added to the pulper) Often it is not necessary to add additional nonionic surfactant as that which is present in the slurry produced in the pulper is sufficient for functioning in the flotation cell although additional nonionic surfactant may be added
  • foam enhancing chemicals foam enhancing chemicals, poiyelectrolytes enzymes pH adjusting chemicals and mixtures thereof
  • the slurry is maintained in the flotation cell for a time temperature and rate of agitation necessary to produce a foam which contains a significant amount of the removed ink
  • Such process conditions are preferably those operating conditions which are defined by the manufacturer of the flotation cell
  • Such conditions typically comprise treating the slurry at about 40°C to about 50°C for about 1 to about 30 minutes injecting air into the cell in an amount sufficient to disperse air bubbles throughout the mixture, with good agitation and without becoming so turbulent as to dislodge ink from the air bubbles This amount of injection is typically about 1 cell volume of air per minute
  • the concentration of the paper fibers is about 0 5 to about 2 0% of the cell
  • Typical chemistries include nonionic surfactants which are long chain alkyl (i e , greater than 12 carbon atoms) fatty ester ethylene oxide/propylene oxide alkoxylates or C 12 16 ⁇ -olefin sulfonates blended with polyglycol (propylene oxide capped with ethylene oxide)
  • the method for determining ash is set forth as TAPPI Standard T 211 om-93 As a result, subsequent processing steps are needed to further reduce the ash content
  • the use of the nonionic surfactant in accordance with the claimed invention is capable of reducing the ash content by at least 50% as measured by the above standard More specifically, the use of the nonionic surfactant can enable a reduction of ash content of greater than about 55% more preferably greater than about 60% and most preferably greater than about 65%
  • the wastepaper comprises a mixture of 65% white laser ledger and 35% colored mixed office waste (MOW)
  • the 35% MOW component is approximately 90% colored material and the remaining 10% includes old newspaper, old magazine and unbleached brown bags
  • the groundwood content is approximately 10%
  • the process sequence includes high consistency pulping (16%) where three 2000 lb pulper batches are defibered and repulped for 40 minutes Each batch is pumped into a dump chest where the consistency is reduced to ⁇ 4% Chemical addition is accomplished by addition to the high consistency pulper or by addition to the lower consistency dump chest A series of cleaning and screening steps follows the pulping first high density centrifugal cleaning and then screening through 1 4 mm holes and 0 15 mm slots The pulp is then diluted further to 1 % consistency in an intermeduite chest prior to flotation Flotation consists of primary flotation with reject froth vacuum followed by secondary flotation Flotation accepts then proceed through two stages of forward centrifugal cleaning and then fine screening (0 1 mm slots) The pulp is further processed by washing and thickening into wet-lap with a twin-wire press Wash and press rejects are clarified using a DAF unit and DAF effluent is used as make-up water in each stage of the deinking process
  • Example 3 InkMasterTM 750 nonionic surfactant added (0 125%) to dump chest at 4% consistency, pulper temperature of 130°F, pH of pulper is 7 2 pH of dump chest is 7 0
  • Example 4 InkMasterTM 750 nonionic surfactant added (0 125%) and 450 ml/ton of a deinking enzyme (Novo Nordisk SP342) addition to dump chest at 4% consistency, pulper temperature of 130°F dump chest temperature of 108°F, pH of pulper is 7 2 pH of dump chest is 7 0
  • Example 5 Same as Example 4 except pulper temperature of 145°F dump chest temperature of 130°F, pH of pulper is 7 1 , pH of dump chest is 7 0
  • Comparative Example 8 Same as Example 7 except the surfactant added (0 10%) is a C 18 fatty ester ethylene oxide/propylene oxide alkoxylate manufactured by Lion Indust ⁇ es, Inc Comparative Example 9 Same as Example 6 except the surfactant added (0 125%) is a C 12 . 16 ⁇ -olefin sulfonate blended with polyglycol (propylene oxide capped with ethylene oxide) sold under the trade name Buckman BRD 2340
  • InkMasterTM 750 is surprisingly well suited for ash reduction
  • Ash levels of ⁇ 2% with single flotation/single wash are achieved at a high system yield of -74%
  • Competitive chemistries typically result in ash removal levels of 10-30%
  • Ash flotation rejects in the inventive examples are on the order of about 40-60% whereas the comparative examples are on the order of about 10-30%
  • Conventional tissue deinking mills employ a double wash/single flotation process to achieve ⁇ 2% ash and typically achieve yields of 60-65%
  • Use of InkMasterTM 750 or other nonionic surfactants as defined in the present invention for ash reduction may therefore allow single pass flotation and avoid the use of additional processing sequences that would adversely impact fiber yield

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  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Toxicology (AREA)
  • Paper (AREA)

Abstract

Cette invention concerne un procédé de réduction de la teneur en cendres d'une fibre qui est mis en oeuvre en même temps qu'un procédé de désencrage de ladite fibre. Ledit procédé consiste (a) à former une pâte grise en désintégrant du papier contenant des encres dans un milieu aqueux contenant au moins un tensioactif non ionique et (b) à soumettre la pâte grise produite au cours de l'étape (a) à une flottation dans une cellule de flottation contenant un milieu aqueux, ledit tensioactif non ionique étant sélectionné de façon à réduire d'au moins 50 % la teneur en cendres initiale.
PCT/IB1996/001220 1995-11-15 1996-11-13 Procede d'amelioration de l'elimination des cendres dans un processus de desencrage WO1997018348A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU73291/96A AU7329196A (en) 1995-11-15 1996-11-13 Process for enhancing ash removal in deinking process

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US55968095A 1995-11-15 1995-11-15
US08/559,680 1995-11-15

Publications (1)

Publication Number Publication Date
WO1997018348A1 true WO1997018348A1 (fr) 1997-05-22

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PCT/IB1996/001220 WO1997018348A1 (fr) 1995-11-15 1996-11-13 Procede d'amelioration de l'elimination des cendres dans un processus de desencrage

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1881105A2 (fr) * 2006-07-21 2008-01-23 Centre Technique De L'industrie Des Papiers Cartons Et Celluloses . Procédé de réduction de la teneur en tensioactifs au cours du désencrage du papier et dispositif de désencrage mettant en oeuvre ce procédé
EP2947200A1 (fr) * 2014-04-03 2015-11-25 Lion Corporation Agent de désencrage pour flotation et procédé de préparation de pâte à papier recyclée

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2642319B1 (de) * 1976-08-31 1977-12-15 Escher Wyss Gmbh Verfahren zur regenerierung von altpapier mit mikroverkapselten bestandteilen
EP0013758A1 (fr) * 1979-01-27 1980-08-06 Henkel Kommanditgesellschaft auf Aktien Procédé de désencrage de vieux papiers imprimés
JPS5679795A (en) * 1979-12-04 1981-06-30 Mitsubishi Petrochemical Co Deinking agent for regenerating waste paper
EP0507325A1 (fr) * 1991-04-05 1992-10-07 Kao Corporation Composition pour désencrage et procédé de désencrage
EP0510954A1 (fr) * 1991-04-25 1992-10-28 Betz Europe, Inc. Procédé et composition pour désencrer du vieux papier imprimé électrostatiquement avec un toner

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2642319B1 (de) * 1976-08-31 1977-12-15 Escher Wyss Gmbh Verfahren zur regenerierung von altpapier mit mikroverkapselten bestandteilen
EP0013758A1 (fr) * 1979-01-27 1980-08-06 Henkel Kommanditgesellschaft auf Aktien Procédé de désencrage de vieux papiers imprimés
JPS5679795A (en) * 1979-12-04 1981-06-30 Mitsubishi Petrochemical Co Deinking agent for regenerating waste paper
EP0507325A1 (fr) * 1991-04-05 1992-10-07 Kao Corporation Composition pour désencrage et procédé de désencrage
EP0510954A1 (fr) * 1991-04-25 1992-10-28 Betz Europe, Inc. Procédé et composition pour désencrer du vieux papier imprimé électrostatiquement avec un toner

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 8133, Derwent World Patents Index; Class A97, AN 81-59725D, XP002027327 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1881105A2 (fr) * 2006-07-21 2008-01-23 Centre Technique De L'industrie Des Papiers Cartons Et Celluloses . Procédé de réduction de la teneur en tensioactifs au cours du désencrage du papier et dispositif de désencrage mettant en oeuvre ce procédé
FR2904011A1 (fr) * 2006-07-21 2008-01-25 Ct Tech De L Ind Du Papier Car Procede de reduction de la teneur en tensioactifs au cours du desencrage du papier et dispositif de desencrage mettant en oeuvre ce procede.
EP1881105A3 (fr) * 2006-07-21 2008-02-13 Centre Technique De L'industrie Des Papiers Cartons Et Celluloses . Procédé de réduction de la teneur en tensioactifs au cours du désencrage du papier et dispositif de désencrage mettant en oeuvre ce procédé
EP2947200A1 (fr) * 2014-04-03 2015-11-25 Lion Corporation Agent de désencrage pour flotation et procédé de préparation de pâte à papier recyclée

Also Published As

Publication number Publication date
AU7329196A (en) 1997-06-05

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