WO2003085191A1 - Agents de desencrage pour la fabrication de papier et de cellulose - Google Patents

Agents de desencrage pour la fabrication de papier et de cellulose Download PDF

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Publication number
WO2003085191A1
WO2003085191A1 PCT/CH2003/000230 CH0300230W WO03085191A1 WO 2003085191 A1 WO2003085191 A1 WO 2003085191A1 CH 0300230 W CH0300230 W CH 0300230W WO 03085191 A1 WO03085191 A1 WO 03085191A1
Authority
WO
WIPO (PCT)
Prior art keywords
homo
deinking
copolymer
water glass
silicate
Prior art date
Application number
PCT/CH2003/000230
Other languages
German (de)
English (en)
Inventor
Angelo Scordialo
Peter Mugler
Original Assignee
Van Baerle & Cie Ag
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 Van Baerle & Cie Ag filed Critical Van Baerle & Cie Ag
Priority to AU2003215494A priority Critical patent/AU2003215494A1/en
Priority to EP03745740A priority patent/EP1492920A1/fr
Publication of WO2003085191A1 publication Critical patent/WO2003085191A1/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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F8/00—Chemical modification by after-treatment
    • 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 deinking aids which are used for the preparation and production of paper raw material from waste paper.
  • BESTATIGUNGSKOPIE Characteristic of the economical deinking process is the fact that the consumer demands high-quality paper types, which is only possible with very expensive, pure cellulose or very expensive cycle processes, with higher chemical doses and greater losses during deinking.
  • Water glass for the deinking process preferably contains a sodium silicate, potassium silicate or mixed silicate, which is offered and used as an aqueous solution in different concentrations.
  • Polymeric polyelectrolytes based on acrylic acid, methacrylic acid, maleic acid and their derivatives with a polymerizable double bond between two carbon atoms have similar dirt-bearing capacity to water glass. Polymerization of a single type of monomer produces homopolymers or, if several different types of monomers are used, so-called copolymers. The chemical and physical properties of the polymers are determined by the monomers used and the polymerization and reaction conditions.
  • ionic monomers such as acrylic acid, methacrylic acid etc.
  • nonionic comonomers such as hydrophobic or hydrophilic comonomers
  • the object of the present invention is an improved deinking aid.
  • a deinking aid comprising silicate and a partially or totally neutralized or partially or totally saponified homo- or copolymer based on acrylic acid, methacrylic acid, maleic acid and / or their ester, nitrile or amide derivatives.
  • silicate in particular mainly alkali metal silicate
  • homo- or copolymer contained in the deinking aid according to the invention improves the dispersing effect of the detached contaminants and printing inks and prevents the fibers from being re-absorbed.
  • the water glass for the process according to the invention for producing the deinking aid according to the invention comprises water and preferably a sodium silicate, potassium silicate or mixed silicate. It is offered and used as an aqueous solution in different concentrations.
  • the water glass used (with alkali metal silicate) is an aqueous solution with a preferred active substance content of alkali metal silicate of 20 to 60 weight percent, more preferably 30 to 50 weight percent and particularly preferably 38 to 45 weight percent, based on the water glass.
  • the water glass to be used according to the invention preferably contains a sodium, potassium or mixed silicate with a molar ratio Si Licium dioxide to metal oxide from 1.0: 1 to 4.0: 1, preferably 1.0: 1 to 3.0: 1, particularly preferably 1.8: 1 to 2.2: 1.
  • the ratio of Na 2 0 for Si0 2 , the deinking process is individually adjusted depending on the desired result and for cost reasons.
  • a particularly preferred solution of sodium silicate in water according to the invention has a density of 1.53 g / ml and contains 14.7 percent by weight Na 2 0 and 28.6 percent by weight Si0 2 .
  • deinking aids according to the invention When neutralizing or saponifying water-soluble or as a dispersion of polyelectrolytes based on the above-described acrylic acid or methacrylic acid and their derivatives with alkaline water glass, deinking aids according to the invention were obtained which have an advantageous effect on the deinking process.
  • homopolymers which can be used according to the invention are polyacrylic acid, poly (methacrylic acid), fully esterified poly (acrylic acid esters) or fully esterified poly (methacrylic acid esters) with MW of preferably about 20,000 g / mol to about 200,000 g / mol, particularly preferably about 100,000 g / mol to about 200000 g / mol, the esterifying radicals in the esterified homopolymers preferably being selected from the linear alkyl radicals having 1 to 4 carbon atoms, for example from methyl and / or ethyl.
  • copolymers which can be used according to the invention are copolymers of acrylic acid and methacrylic acid in a molar ratio of acrylic acid to methacrylic acid of preferably 10: 1 to 1:10 and MW of about 20,000 to about 200,000 g / mol, particularly preferably about 100,000 to about 200,000 g / mol.
  • copolymers are also partially esterified homopolymers of acrylic acid or methacrylic acid, the same information regarding the molecular molecular weight and the esterifying radical are preferred, as were made above for the fully esterified homopolymers, and the molar ratio of unesterified to esterified carboxyl groups can range from about 10: 1 to about 1:10.
  • copolymers are copolymers of free acrylic or methacrylic acid monomers which have been copolymerized with acrylonitrile and / or methacrylonitrile and / or acrylamide and / or methacrylamide.
  • the molar ratio between acrylic acid / methacrylic acid units on the one hand and acrylonitrile / methacrylonitrile / acrylamide / methacrylamide units on the other hand is preferably in the range from about 10: 1 to about 1:10.
  • Carboxylic acid groups present in the homo- or copolymer are only “partially” neutralized, or existing ester, nitrile or amide groups are only “partially” saponified if the water glass (i.e. the alkali metal silicate contained therein) is deficient in comparison to these functional groups
  • carboxylic acid groups present in the homo- or copolymer are preferably totally neutralized with water glass, ie the water glass is used in a sufficiently large excess to shift the pH of the aqueous medium to at least about 9, preferably about 12 to 14. It is according to the invention does not necessarily require that the homo- or copolymer EXISTING ⁇ dene ester, nitrile or amide groups are totally saponified.
  • these groups are also preferably saponified by using a sufficiently large excess and, if desired, by increasing the temperature and sufficiently long reaction time, the pH in the final state likewise likewise being set to at least about 9 and preferably to about 12 to 14.
  • the homo- or copolymer is totally neutralized and / or totally saponified to such an extent that a polyelectrolyte (a polycarboxylate) is formed from it and the solution has a pH of about 12 to 14.
  • partial or total neutralization which is accompanied by partial or total deprotonation of carboxylic acid groups in the homo- or copolymer, or partial or total saponification of ester, nitrile or amide groups
  • some of the alkali metal silicates are protonated in water glass and can thereby gel to silica gel and is then no longer an alkali metal silicate.
  • the detectable feature of all of these modifications is that they contain silicate.
  • the homo- or copolymer solution or dispersion is preferably introduced into the water glass with stirring.
  • the mostly slightly exothermic reaction leads to a temperature decrease, which is a positive response to the reaction.
  • solid alkali metal silicate can be dissolved with a dilute aqueous homo- or copolymer solution or dispersion.
  • the proportion of homo- or copolymer of acrylic acid, methacrylic acid, maleic acid and / or its ester, nitrile and amide derivatives is preferably 0.5 to 10 'Gewichtspro- cent, more preferably 1 to 5 percent by weight and particularly preferably 1.5 to 3 percent by weight, based on the water glass.
  • the deinking aid according to the invention is added to dissolve the waste paper stock in the dissolving container with further aids. After the dissolving and cleaning process, the separated impurities and printing inks are separated mechanically, mostly flotatively, and the pulp and filler suspension obtained is used as a paper raw material for the production of high-quality paper types.
  • the deinking aid according to the invention reduces the amount of aid required and the losses. The paper quality is increasing, which is otherwise only feasible with more chemicals and therefore higher costs.
  • the deinking aid according to the invention reduces the consumption of chemicals, increases the yield of recyclable paper raw material, reduces the losses and the costs of utilizing the losses, and reduces the tendency of the circulating water system to deposit.
  • the deinking aid according to the invention for example based on an organic polymeric acid which is partially or completely neutralized with water glass, increases the yield of reusable cellulose fibers and fillers and reduces losses.
  • the brightness and whiteness of the raw material are increased.
  • the simultaneous sequestering and thresholding properties reduce the formation of incrustations and harmful deposits in the water cycle. Undesirable red coloring due to water-soluble printing inks is reduced.
  • reduction as used in the context of the present application in the context of water-soluble red printing inks is to be used as a reduction, not as a chemical reduction. stand .
  • Example 2 In situ production of a deinking aid
  • Waste paper and the raw materials for the deinking aid are continuously fed into the dissolving drum of a deinking plant.
  • the proportion of water glass is 1.2%. 3% of the water glass are replaced in the static mixer and reaction tube by a polyacrylic acid with 50% polymer content and a molecular weight of 150,000 g / mol and fed directly to the deinking process.
  • Example 3 In situ production of a deinking aid
  • a conventional water glass and a deinking aid according to the invention according to Example 1 were used in a deinking process in comparison.
  • the deinking formulation contains 0.4% fatty acid, 0.25% NaOH saponification, 0.5% NaOH, 1.2% conventional water glass or deinking aid according to the invention, and 0.7% hydrogen peroxide.
  • the loss reduction was 3.5

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Toxicology (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Paper (AREA)

Abstract

Agents de désencrage qui contiennent un homopolymère ou copolymère à base d'acide acrylique, d'acide méthacrylique, d'acide maléique et / ou de leurs dérivés esters, nitriles ou amides sous forme partiellement ou totalement neutralisée ou saponifiée, et du silicate, et qui sont utilisés pour la préparation de papier et de cellulose. Lesdits agents de désencrage sont fabriqués par neutralisation et / ou saponification d'un homopolymère ou copolymère de ce type avec du verre soluble.
PCT/CH2003/000230 2002-04-10 2003-04-09 Agents de desencrage pour la fabrication de papier et de cellulose WO2003085191A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2003215494A AU2003215494A1 (en) 2002-04-10 2003-04-09 De-inking agent for producing paper and cellulose
EP03745740A EP1492920A1 (fr) 2002-04-10 2003-04-09 Agents de desencrage pour la fabrication de papier et de cellulose

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2002115620 DE10215620B4 (de) 2002-04-10 2002-04-10 Verwendung einer polymeren Wasserglasverbindung
DE10215620.4 2002-04-10

Publications (1)

Publication Number Publication Date
WO2003085191A1 true WO2003085191A1 (fr) 2003-10-16

Family

ID=28684857

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH2003/000230 WO2003085191A1 (fr) 2002-04-10 2003-04-09 Agents de desencrage pour la fabrication de papier et de cellulose

Country Status (5)

Country Link
EP (1) EP1492920A1 (fr)
CN (1) CN1646763A (fr)
AU (1) AU2003215494A1 (fr)
DE (1) DE10215620B4 (fr)
WO (1) WO2003085191A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010147581A1 (fr) * 2009-06-17 2010-12-23 Kemira Oyj Procédé de désencrage

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009012468A1 (de) 2009-03-12 2010-09-23 Hwt Wassertechnische Anlagen Gmbh Verfahren zur Bereitstellung von Wasserglas für eine industrielle Anwendung
DE102009016859B4 (de) 2009-04-08 2018-06-14 Erbe Elektromedizin Gmbh Wasserstrahlchirurgieinstrument

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2100500A1 (de) * 1970-01-08 1971-08-05 Unilever Nv Chemische Verbindungen und sie ent haltende Wasch und Reinigungsmittel
EP0055055A2 (fr) * 1980-12-22 1982-06-30 Rohm And Haas Company Procédé pour stabiliser des compositions de polymères hydrophiles et compositions de polymères hydrophiles stabiliseés
EP0373375A2 (fr) * 1988-11-23 1990-06-20 Henkel Kommanditgesellschaft auf Aktien Désencrage de vieux papiers
DE4204915A1 (de) * 1992-02-19 1993-08-26 Benckiser Knapsack Ladenburg Verfahren zur wiederaufbereitung von altpapier

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19719888A1 (de) * 1996-12-21 1998-06-25 Clariant Gmbh Pulverförmige Wasch- und Reinigungsmittel-Komponente

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2100500A1 (de) * 1970-01-08 1971-08-05 Unilever Nv Chemische Verbindungen und sie ent haltende Wasch und Reinigungsmittel
EP0055055A2 (fr) * 1980-12-22 1982-06-30 Rohm And Haas Company Procédé pour stabiliser des compositions de polymères hydrophiles et compositions de polymères hydrophiles stabiliseés
EP0373375A2 (fr) * 1988-11-23 1990-06-20 Henkel Kommanditgesellschaft auf Aktien Désencrage de vieux papiers
DE4204915A1 (de) * 1992-02-19 1993-08-26 Benckiser Knapsack Ladenburg Verfahren zur wiederaufbereitung von altpapier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010147581A1 (fr) * 2009-06-17 2010-12-23 Kemira Oyj Procédé de désencrage
US8617353B2 (en) 2009-06-17 2013-12-31 Kemira Oyj Deinking process

Also Published As

Publication number Publication date
EP1492920A1 (fr) 2005-01-05
DE10215620B4 (de) 2006-05-18
CN1646763A (zh) 2005-07-27
AU2003215494A1 (en) 2003-10-20
DE10215620A1 (de) 2003-10-30

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