SE9302527L - Put on multistage bleaching - Google Patents

Put on multistage bleaching

Info

Publication number
SE9302527L
SE9302527L SE9302527A SE9302527A SE9302527L SE 9302527 L SE9302527 L SE 9302527L SE 9302527 A SE9302527 A SE 9302527A SE 9302527 A SE9302527 A SE 9302527A SE 9302527 L SE9302527 L SE 9302527L
Authority
SE
Sweden
Prior art keywords
pulp
magnesium ions
treatment
complex
added
Prior art date
Application number
SE9302527A
Other languages
Swedish (sv)
Other versions
SE9302527D0 (en
SE512673C2 (en
Inventor
Klas Norborg
Original Assignee
Stora Kopparbergs Bergslags 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 Stora Kopparbergs Bergslags Ab filed Critical Stora Kopparbergs Bergslags Ab
Priority to SE9302527A priority Critical patent/SE512673C2/en
Publication of SE9302527D0 publication Critical patent/SE9302527D0/en
Publication of SE9302527L publication Critical patent/SE9302527L/en
Publication of SE512673C2 publication Critical patent/SE512673C2/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
    • D21C9/1026—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

The method involves an acid bleaching stage, an intermediate treatment after the acid bleaching stage during which at least one complex building is added, an extraction stage during which the pulp is treated with hydrogen peroxide in conjunction with which magnesium ions are added to the pulp. The pulp is not washed between the acid bleaching stage and the addition of complex builders and magnesium ions. The pulp is bleached with ozone before the complex builders and magnesium ions are added. The pulp is pretreated with acid to give a final pH between 2 and 4 before ozone treatment. The pulp is pretreated with complex builders before ozone treatment, which is followed by further treatment with complex builders and addition of magnesium ions before hydrogen peroxide treatment.
SE9302527A 1993-07-29 1993-07-29 Multi-stage bleaching of lignocellulose pulp SE512673C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE9302527A SE512673C2 (en) 1993-07-29 1993-07-29 Multi-stage bleaching of lignocellulose pulp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9302527A SE512673C2 (en) 1993-07-29 1993-07-29 Multi-stage bleaching of lignocellulose pulp

Publications (3)

Publication Number Publication Date
SE9302527D0 SE9302527D0 (en) 1993-07-29
SE9302527L true SE9302527L (en) 1995-01-30
SE512673C2 SE512673C2 (en) 2000-04-17

Family

ID=20390703

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9302527A SE512673C2 (en) 1993-07-29 1993-07-29 Multi-stage bleaching of lignocellulose pulp

Country Status (1)

Country Link
SE (1) SE512673C2 (en)

Also Published As

Publication number Publication date
SE9302527D0 (en) 1993-07-29
SE512673C2 (en) 2000-04-17

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Legal Events

Date Code Title Description
NUG Patent has lapsed