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SE9203366L - Process for delignification and / or bleaching of cellulose pulp - Google Patents

Process for delignification and / or bleaching of cellulose pulp

Info

Publication number
SE9203366L
SE9203366L SE9203366A SE9203366A SE9203366L SE 9203366 L SE9203366 L SE 9203366L SE 9203366 A SE9203366 A SE 9203366A SE 9203366 A SE9203366 A SE 9203366A SE 9203366 L SE9203366 L SE 9203366L
Authority
SE
Sweden
Prior art keywords
cellulose pulp
bleaching
delignification
sodium ions
present
Prior art date
Application number
SE9203366A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE9203366D0 (en
Inventor
O S A G Lindeberg
Original Assignee
Mo Och Domsjoe Ab
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 Mo Och Domsjoe Ab filed Critical Mo Och Domsjoe Ab
Priority to SE9203366A priority Critical patent/SE9203366L/en
Publication of SE9203366D0 publication Critical patent/SE9203366D0/en
Priority to AU54395/94A priority patent/AU5439594A/en
Priority to PCT/SE1993/000953 priority patent/WO1994011569A1/en
Publication of SE9203366L publication Critical patent/SE9203366L/en

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1005—Pretreatment of the pulp, e.g. degassing the pulp
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1042—Use of chelating agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/16—Bleaching ; Apparatus therefor with per compounds
    • D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

When using oxidative bleaching agents, such as peroxide, to delignify and/or bleach ligning containing cellulosic pulp, difficulty explained swings are sometimes obtained in the bleaching results. This problem is solved by the present invention, which relates to a method in which the cellulose pulp is pretreated with a complexing agent in the presence of liquid and sodium ions and then treated with an oxidative bleaching agent. The method is characterized by adding a process foreign magnesium in any form to the cellulose pulp prior to and/or during the pretreatment process, in a quantity which is determined at least partially by the amount of sodium ions present.
SE9203366A 1992-11-11 1992-11-11 Process for delignification and / or bleaching of cellulose pulp SE9203366L (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE9203366A SE9203366L (en) 1992-11-11 1992-11-11 Process for delignification and / or bleaching of cellulose pulp
AU54395/94A AU5439594A (en) 1992-11-11 1993-11-10 A method in delignifying and/or bleaching of cellulose pulp
PCT/SE1993/000953 WO1994011569A1 (en) 1992-11-11 1993-11-10 A method in delignifying and/or bleaching of cellulose pulp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9203366A SE9203366L (en) 1992-11-11 1992-11-11 Process for delignification and / or bleaching of cellulose pulp

Publications (2)

Publication Number Publication Date
SE9203366D0 SE9203366D0 (en) 1992-11-11
SE9203366L true SE9203366L (en) 1994-05-12

Family

ID=20387773

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9203366A SE9203366L (en) 1992-11-11 1992-11-11 Process for delignification and / or bleaching of cellulose pulp

Country Status (3)

Country Link
AU (1) AU5439594A (en)
SE (1) SE9203366L (en)
WO (1) WO1994011569A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE500616C2 (en) * 1993-06-08 1994-07-25 Kvaerner Pulping Tech Bleaching of chemical pulp with peroxide at overpressure
EP1375734A1 (en) * 2002-06-17 2004-01-02 SCA Hygiene Products GmbH Bleached, strong sulfite chemical pulp, a process for the production thereof and products derived therefrom
PL2435628T3 (en) * 2009-05-29 2014-09-30 Solvay Process for the bleaching of mechanical paper pulp

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2841013C2 (en) * 1978-09-21 1984-06-07 Degussa Ag, 6000 Frankfurt Process for full bleaching of pulp
DK0402335T4 (en) * 1989-06-06 2001-06-25 Eka Chemicals Ab Method for bleaching lignocellulosic pulp
SE470065C (en) * 1991-04-30 1996-01-15 Eka Nobel Ab Treatment of chemical pulp with an acid and then a magnesium and calcium compound in chlorine-free bleaching

Also Published As

Publication number Publication date
WO1994011569A1 (en) 1994-05-26
SE9203366D0 (en) 1992-11-11
AU5439594A (en) 1994-06-08

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