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WO2001023665A1 - Procedes et compositions pour la retrituration du papier - Google Patents

Procedes et compositions pour la retrituration du papier Download PDF

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Publication number
WO2001023665A1
WO2001023665A1 PCT/CA2000/001115 CA0001115W WO0123665A1 WO 2001023665 A1 WO2001023665 A1 WO 2001023665A1 CA 0001115 W CA0001115 W CA 0001115W WO 0123665 A1 WO0123665 A1 WO 0123665A1
Authority
WO
WIPO (PCT)
Prior art keywords
surfactant
paper
composition
oxidizer
persulfate
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.)
Ceased
Application number
PCT/CA2000/001115
Other languages
English (en)
Inventor
Peter Gordon Jobling
Marc Raymond Poirier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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
Priority claimed from CA 2283982 external-priority patent/CA2283982A1/fr
Application filed by Individual filed Critical Individual
Priority to AU75005/00A priority Critical patent/AU7500500A/en
Publication of WO2001023665A1 publication Critical patent/WO2001023665A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • 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 the recovery of fibre from waste paper and paper broke which has been treated with wet-strength resins. Specifically the present invention is directed to the removal of such resins from the fibre material so that such fibre material may be recycled to a paper web forming process.
  • Paper under conditions in which the paper must be used in the wet state or to absorb moisture has become one of the major utilities of paper products Paper normally achieves its integrity or fibre to fibre strength by bonding between the fibres, possibly by hydrogen bonding of the various molecular components of the fibre. Such fibre to fibre bonding provides adequate strength for papers used in the dry condition, such as writing or printing papers or packaging which is not subjected to outdoor atmospheric conditions
  • wet-strength is developed in paper products by various coating methods which provide continuous or discrete depositions of polymeric resins which effectively bond portions of the paper product
  • wet-strength resins have provided difficult problems for the reuse of waste paper, such that such waste paper in many instances is burned or landfilled rather than subject the paper to expensive or poor yield cleansing processes.
  • oxidizing salts in a dilute aqueous solution are utilized to loosen the fibre to resin bonds.
  • the paper broke is soaked in the oxidizing solution with preferably mild agitation.
  • the oxidizing salt agents can be selected from sodium hypochlorite, sodium chlorite, sodium chlorate, potassium chlorate, ammonium persulfate and sodium peroxide.
  • the solution utilized generally has a pH between 7 and 10. Elevated temperatures may be utilized in the range of 115° to 180° F.
  • thermosetting wet-strength resins from paper is addressed in U.S. Pat. No. 3,245,868.
  • Inclined screw fed vessels are used to handle the pulp.
  • the resin can be removed by either acidic solutions for formaldehyde resins or basic solutions (caustic soda) for removing polyamide resins.
  • Temperatures as high as 149° C. are contemplated, but the patent does not direct itself to paper brightness enhancement. Additionally, the patent contemplates caustic strengths to dry fibre pulp of only 4%.
  • U.S. Pat. No. 3,427,217 discloses a recycle process for wet-strength resin coated broke wherein an oxidizing salt such as sodium hypochlorite is used to facilitate the pulping of the coated paper.
  • Sodium hydroxide can be used to provide a basic solution.
  • the wet-strength resins can include polyaminopolyamide-epichlorohydrin resins, urea-formaldehyde and melamie-formaldehyde resins, and the like
  • U.S. Pat. No. 5674358 discloses a process for repulping of wet-strength resin coated paper or paperboard using a non-chlorinating oxidizing agent, such as a persulfate, in combination with a buffer to maintain the process pH at a level between 7 and 12.
  • a non-chlorinating oxidizing agent such as a persulfate
  • U.S. Pat. No. 5718837 describes a process using a composition containing a mixture of a persulfate and additional, different buffering agents.
  • U.S. Pat. No. 5904808 describes a further process using a persulfate and a buffer which process is conducted at a pH level of between 2.3 to 6.5.
  • the buffering systems used in this process are buffers which will maintain these acidic pH levels.
  • U.S. Pat. No. 4416727 provides a process wherein the oxidizing agent is a high pressure oxygen system. This process is stated to be particularly appropriate for the removal of thermoplastic resins.
  • the present invention comprises a process for the recovery of fibres, particularly cellulose fibres, from waste paper or paperboard, paper trimmings and paper broke which have previously been treated with a wet-strength resin.
  • the present invention provides a repulping process for use on waste paper containing a wet-strength resin, comprising treating said waste paper with a mixture of an alkali hydroxide and essentially 100% potassium persulfate.
  • potassium persulfate a material comprised of greater than 99% potassium persulfate which contains only contaminant levels of other materials.
  • the invention also provides a repulping process for use on waste paper containing a wet-strength resin, comprising treating said waste paper with a non-chlorinated oxidizer in combination with a surfactant.
  • wet-strength resin coated papers such as diapers, towels and weather resistant packaging material constitutes a greater and greater percentage of the present day paper production.
  • strength imparting coatings have been applied to paper products, which coatings were easily hydrolyzed or dissolved.
  • wet-strength paper products wherein polymeric resins are used as binders for the paper products, a substantial loss in paper fibre is realized due to the inability to reprocess waste paper or paper broke.
  • Paper broke is that fraction of the paper product of a paper production which is rejected for any one of a number of reasons, such as crushed, damaged, or wrinkled paper, trim from a paper roll or other rejected paper occurring during the paper production process. This paper broke constitutes a substantial portion of the total paper fibre processed in paper production, sometimes 20% of the paper processed. Such paper broke was easily recycled when binders were not used or the binders were easily dealt with.
  • the present invention overcomes this inability and is effective on previously difficult polymeric resin coatings on paper broke.
  • Repulping of the waste paper, or the like typically consists of subjecting the paper stock or paper broke to an alkaline, aqueous solution to provide a pulp slurry consisting of 2% to 25% pulp, and contacting the pulp with the oxidizer salt while maintaining the slurry at an elevated temperature.
  • a pulp slurry consisting of 2% to 25% pulp
  • the pulp slurry is then diluted (if necessary) to a pulp concentration (also know as pulp
  • wet-strength paper production processes can utilize substantially more of the total fibre content of paper formed in the paper furnish by recovering the paper broke without resort to the prior art practice of burning or disposing of the valuable paper fibre content of the broke which is normally a by-product of wet-strength paper production processes.
  • the non-chlorinated oxidizer is preferably an alkali or alkali earth metal persulfate or ammonium persulfate. More preferably, the oxidizer is an alkali metal persulfate, and most preferably, the oxidizer is potassium persulfate.
  • the level of the non-chlorinated oxidizer used in the repulping process is preferably in the range of from 0.1 to 10% by weight on the weight of pulp and oxidizer. More preferably, the level of oxidizer is between 0.3 to 7.5%, and most preferably is between 0.5 to 5% by weight.
  • the repulping process is conduct at an alkali pH of between 8 to 12, and more preferably, between a pH of between 9 to 11. Adjustment of the pH to these pH levels can be achieved by adding various alkali materials such as alkali metal hydroxides such as sodium or potassium hydroxide, but can include various buffers such as alkali metal carbonates or bicarbonates such as sodium carbonate.
  • the process can also be conduct under acidic conditions and for these acidic systems, acids such as sulphuric acid can be used for pH adjustment, or acidic buffer solutions, such as sodium citrate can be used.
  • the pH is preferably adjusted to a level of between 2 and 6, and more preferably between the level of 3 and 5. Most preferably, however, the process is conducted under alkali pH conditions.
  • the amount of acid or alkali added is dependent upon the original pH of the system and the desired target pH of the process. Also, additional acid or alkali may need to be added to the process during repulping in order to maintain the pH in the desired range.
  • the temperature of the repulping process is preferably in the range of from 40°C to 120°C, more preferably 50° to 90°C, and most preferably 60°C to 80°C.
  • the pulp consistency of the pulp to be treated is preferably in the range of from 1% to 30%, more preferably between 5% to 25%, and most preferably between the levels of 8% to 1 5%, bv weight
  • the wet-strength resins which can be removed by the process of the present invention include polyaminopolyamide-epichlorohydrin resins, urea-formaldehyde and melamie-formaldehyde resins, and the like.
  • the surfactant is preferably added to provide a surfactant level of between 0.1 to 10% by weight, and more preferably to provide a surfactant level of between 0.3 to 7.5%. Most preferably, the surfactant level is between 0.5 and 5% by weight.
  • the present invention provides a composition for use in the repulping process of the present invention, which composition comprises a mixture of an non-chlorinated oxidizer and an surfactant.
  • the composition is preferably a dry blend composition, and preferably comprises between 0.1 to 20% (by weight of the composition) of surfactant. More preferably, the surfactant level in the composition is between 1 and 15%, and more preferably is between 3 and 10%, by weight.
  • oxidizers such as potassium persulfate
  • shipping restrictions can be reduced if the amount of oxidizer is reduced by the addition of the surfactant.
  • the surfactant used must be sufficiently compatible with the oxidizer in order to achieve this ability.
  • the surfactant (as may also be termed as the emulsifier or the wetting agent component) may be chosen from the wide range of emulsifying agents known in the art. This includes cationic, anionic and nonionic surfactants. Particularly preferred, however, are nonionic surfactants.
  • Suitable surfactants include alcohol alkoxylates, phenol alkoxylates, poly(oxyalkvlene glycols, poly(oxyalkylene fatty acid esters, amine alkoxylates, fattv acid esters of sorbitol and glycerol, fatty acid salts, sorbitan esters, poly(oxyalkylene) sorbitan esters, fatty amine alkoxylates, poly(oxyalkylene)glycol esters, fatty acid amides, fatty acid amide alkoxylates, fatty amine, quaternary amines, alkyloxazolines, alkenyloxazolines, imidazolines, alkyl-sulfonates, alkylarylsulfonates, alkylsulfosuccinates, alkylphosphates, alkenylphosphates, phosphate esters, lecithin, copolymers of poly(oxyalkylene) glycols and poly(12-hydroxystearic acid),
  • emulsifying agents are alkoxylated alcohols, and in particular ethoxylated C9 to Cl 1 alcohols, 2-alkyl- and
  • 2-alkenyl-4,4'-bis(hydroxymethyl)oxazolines the fatty acid esters of sorbitol, lecithin, copolymers of poly(oxyalkylene)glycols and poly(12-hydroxystearic acid), condensation products of compounds comprising at least one primary amine and poly[alk(en)yl]succinic acid or anhydride, and mixtures thereof.
  • reaction time will vary depending on the wet strength resin and the alkali charge, but the reaction time can be operable from between 1 minute of contact time to 280 minutes of contact time. Preferably, however, the reaction time should be in the range of 5 to 120 minutes, and most preferably, the reaction time is between 60 and 120 minutes.
  • the wet-strength resin coated paper broke is first transported to a reactor where an oxidizer salt such as potassium persulfate and an alkali, such as sodium hydroxide, which is used for pH adjustment, are added and intermixed with the paper material with agitation at elevated temperatures.
  • an oxidizer salt such as potassium persulfate and an alkali, such as sodium hydroxide, which is used for pH adjustment, are added and intermixed with the paper material with agitation at elevated temperatures.
  • a surfactant is also added to the system.
  • a composition comprising a premixed combination of surfactant and persulfate is added.
  • the wet-strength coated paper broke, having been processed in the reactor is then conveyed to a screening station. During this conveyance, water is added to the paper slurry in order to provide a screenable feed with a consistency of approximately 3%.
  • the separated fibres pass through the screening means and are recyclable after being washed with an aqueous feed on a cylindrical drum washer. Rejects which do not pass through the screening means and consist of agglomerated fibres and any solid foreign material are removed for disposal or burning.
  • the rejects can be recycled to the upstream portion of the reactor for further treatment in an attempt to separate the fibre constituents of the rejects. Dissolved polymer components are removed from the acceptable fibres during the course of the washing cycle.
  • the washed, separated fibres are then in a condition to be utilized for paper production, and they can be recycled to the production process in which they originally formed the broke. In this manner, the fraction of paper production which becomes broke, and which has been known to be as high as 20% of paper production, is effectively reintroduced into the system and fibre losses are therefore greatly minimized.

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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

La présente invention concerne un procédé et une composition destinés à la récupération de la fibre du vieux papier et des chutes de papier traité aux résines de résistance à l'humidité. L'invention concerne plus particulièrement l'élimination de telles résines du matériau fibreux, de façon à permettre un recyclage du matériau fibreux pour un traitement de formation de bande de papier, par utilisation de persulfates sélectionnés tels que le persulfate de potassium. Eventuellement, le persulfate s'utilise en combinaison avec un tensioactif. L'invention permet ainsi une meilleure retrituration du vieux papier.
PCT/CA2000/001115 1999-09-28 2000-09-28 Procedes et compositions pour la retrituration du papier Ceased WO2001023665A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU75005/00A AU7500500A (en) 1999-09-28 2000-09-28 Processes and compositions for repulping paper

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CA2,283,982 1999-09-28
CA 2283982 CA2283982A1 (fr) 1999-09-28 1999-09-28 Procedes et compositions pour le repulpage du papier
US09/412,625 US20010007277A1 (en) 1999-09-28 1999-10-04 Process and compositions for repulping paper

Publications (1)

Publication Number Publication Date
WO2001023665A1 true WO2001023665A1 (fr) 2001-04-05

Family

ID=25681223

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA2000/001115 Ceased WO2001023665A1 (fr) 1999-09-28 2000-09-28 Procedes et compositions pour la retrituration du papier

Country Status (3)

Country Link
US (1) US20010007277A1 (fr)
AU (1) AU7500500A (fr)
WO (1) WO2001023665A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007035507A1 (fr) * 2005-09-16 2007-03-29 E. I. Du Pont De Nemours And Company Procede de remise en pate d'un casse de papier resistant a l’etat humide
CN112553935A (zh) * 2020-12-02 2021-03-26 浙江金龙再生资源科技股份有限公司 一种低木素含量低过渡金属含量的高湿强废纸的处理方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8034203B2 (en) * 2007-04-13 2011-10-11 United States Gypsum Company Gypsum wallboard with improved nail pull strength and the method for making same
CN106337311A (zh) * 2015-07-11 2017-01-18 陈福堂 一种特种湿强纸处理助剂及其使用方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4309298A (en) * 1979-04-02 1982-01-05 Hoechst Aktiengesellschaft Oxidative desizing agent and process for oxidative desizing
US5279313A (en) * 1990-08-18 1994-01-18 Wella Aktiengesellschaft Two component composition and method for bleaching hair
EP0585955A1 (fr) * 1992-09-03 1994-03-09 Hercules Incorporated Remise en pâte de papier et carton
WO1995005504A1 (fr) * 1993-08-17 1995-02-23 Fmc Corporation Melanges de persulfate/metal servant a la desintegration et a la decoloration de vieux papiers
WO1997038158A1 (fr) * 1996-04-08 1997-10-16 Fmc Corporation Systeme a base de persulfate destine a la desintegration de casses de fabrication dotes d'une resistance a l'etat humide et d'un fort indice kappa

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4309298A (en) * 1979-04-02 1982-01-05 Hoechst Aktiengesellschaft Oxidative desizing agent and process for oxidative desizing
US5279313A (en) * 1990-08-18 1994-01-18 Wella Aktiengesellschaft Two component composition and method for bleaching hair
EP0585955A1 (fr) * 1992-09-03 1994-03-09 Hercules Incorporated Remise en pâte de papier et carton
WO1995005504A1 (fr) * 1993-08-17 1995-02-23 Fmc Corporation Melanges de persulfate/metal servant a la desintegration et a la decoloration de vieux papiers
WO1997038158A1 (fr) * 1996-04-08 1997-10-16 Fmc Corporation Systeme a base de persulfate destine a la desintegration de casses de fabrication dotes d'une resistance a l'etat humide et d'un fort indice kappa

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007035507A1 (fr) * 2005-09-16 2007-03-29 E. I. Du Pont De Nemours And Company Procede de remise en pate d'un casse de papier resistant a l’etat humide
CN112553935A (zh) * 2020-12-02 2021-03-26 浙江金龙再生资源科技股份有限公司 一种低木素含量低过渡金属含量的高湿强废纸的处理方法
CN112553935B (zh) * 2020-12-02 2022-11-11 浙江金龙再生资源科技股份有限公司 一种低木素含量低过渡金属含量的高湿强废纸的处理方法

Also Published As

Publication number Publication date
AU7500500A (en) 2001-04-30
US20010007277A1 (en) 2001-07-12

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