SE9303233L - Chlorine-free bleaching of chemical pulp - Google Patents

Chlorine-free bleaching of chemical pulp

Info

Publication number
SE9303233L
SE9303233L SE9303233A SE9303233A SE9303233L SE 9303233 L SE9303233 L SE 9303233L SE 9303233 A SE9303233 A SE 9303233A SE 9303233 A SE9303233 A SE 9303233A SE 9303233 L SE9303233 L SE 9303233L
Authority
SE
Sweden
Prior art keywords
peroxide
bleaching
mentioned
chlorine
bdmt
Prior art date
Application number
SE9303233A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE9303233D0 (en
SE500954C2 (en
Inventor
Anders Bergqvist
Marcelo Leite
Original Assignee
Kvaerner Pulping Tech
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 Kvaerner Pulping Tech filed Critical Kvaerner Pulping Tech
Priority to SE9303233A priority Critical patent/SE500954C2/en
Publication of SE9303233D0 publication Critical patent/SE9303233D0/en
Priority to US08/218,647 priority patent/US6605181B1/en
Priority to AU78260/94A priority patent/AU7826094A/en
Priority to PCT/SE1994/000889 priority patent/WO1995009945A1/en
Priority to BR9407668A priority patent/BR9407668A/en
Publication of SE9303233L publication Critical patent/SE9303233L/en
Publication of SE500954C2 publication Critical patent/SE500954C2/en
Priority to FI961419A priority patent/FI961419A/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
    • D21C9/16—Bleaching ; Apparatus therefor with per compounds
    • D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
    • 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
    • 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

Landscapes

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

Abstract

The invention entails a method for bleaching of chemical paper pulp that has been boiled and preferably oxygen delignified with viscosity and strength conserving methods for low kappa-values, preferably lower than 16, but most preferably below 10, without using high chlorine-content chemicals and utilization of a bleaching sequence including 3 steps, where the first step is QP (quality procedure) whereby the first P-step which is a specially delignified P-step, whereby the dose of peroxide is less than 10 kilo/BDMT and the mentioned P-step following delignifying acid step, preferably including a washing, as well as a second P-step following the mentioned acid step, preferably including a washing, which second P-step is an especially bleaching peroxide step, whereby the peroxide dose is greater than 5 kilo/BDMT and is greater than the amount of peroxide that was added in the first mentioned step.
SE9303233A 1993-10-01 1993-10-01 Chlorine-free bleaching of chemical paper pulp SE500954C2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
SE9303233A SE500954C2 (en) 1993-10-01 1993-10-01 Chlorine-free bleaching of chemical paper pulp
US08/218,647 US6605181B1 (en) 1993-10-01 1994-03-28 Peroxide bleach sequence including an acidic bleach stage and including a wash stage
AU78260/94A AU7826094A (en) 1993-10-01 1994-09-27 Method of treating chemical paper pulp without using chlorine-containing chemicals
PCT/SE1994/000889 WO1995009945A1 (en) 1993-10-01 1994-09-27 Method of treating chemical paper pulp without using chlorine-containing chemicals
BR9407668A BR9407668A (en) 1993-10-01 1994-09-27 Process for bleaching chemical pulp or dissolving wood pulp that has been cooked and device for implementing the process
FI961419A FI961419A (en) 1993-10-01 1996-03-29 A method of treating chemical pulp without the use of chlorine-containing chemicals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9303233A SE500954C2 (en) 1993-10-01 1993-10-01 Chlorine-free bleaching of chemical paper pulp

Publications (3)

Publication Number Publication Date
SE9303233D0 SE9303233D0 (en) 1993-10-01
SE9303233L true SE9303233L (en) 1994-10-10
SE500954C2 SE500954C2 (en) 1994-10-10

Family

ID=20391301

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9303233A SE500954C2 (en) 1993-10-01 1993-10-01 Chlorine-free bleaching of chemical paper pulp

Country Status (1)

Country Link
SE (1) SE500954C2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE9402542D0 (en) * 1994-07-20 1994-07-20 Kvaerner Pulping Tech Method and apparatus for bleaching with pressurized peroxide

Also Published As

Publication number Publication date
SE9303233D0 (en) 1993-10-01
SE500954C2 (en) 1994-10-10

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Legal Events

Date Code Title Description
NUG Patent has lapsed