CA2308580C - Procede de blanchiment de la pate mecanique - Google Patents

Procede de blanchiment de la pate mecanique Download PDF

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Publication number
CA2308580C
CA2308580C CA002308580A CA2308580A CA2308580C CA 2308580 C CA2308580 C CA 2308580C CA 002308580 A CA002308580 A CA 002308580A CA 2308580 A CA2308580 A CA 2308580A CA 2308580 C CA2308580 C CA 2308580C
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CA
Canada
Prior art keywords
pulp
alkaline earth
earth metal
bleaching
suspension
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.)
Expired - Lifetime
Application number
CA002308580A
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English (en)
Other versions
CA2308580A1 (fr
Inventor
Jeffrey K.-S. Wan
M. Catherine Depew
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.)
West Fraser Mills Ltd
Original Assignee
West Fraser Mills Ltd
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 PCT/CA1998/000918 external-priority patent/WO1999015729A1/fr
Application filed by West Fraser Mills Ltd filed Critical West Fraser Mills Ltd
Priority to CA002308580A priority Critical patent/CA2308580C/fr
Priority claimed from PCT/CA1999/000239 external-priority patent/WO2000017442A1/fr
Publication of CA2308580A1 publication Critical patent/CA2308580A1/fr
Application granted granted Critical
Publication of CA2308580C publication Critical patent/CA2308580C/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • D21C9/1047—Conserving the bleached 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
    • D21C9/16—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

L'invention porte sur un procédé de blanchiment de pâte de bois résineux et de pâte de feuillus non blanchies au moyen de peroxyde d'hydrogène, sans ajout d'alcali pour l'activation du processus. La solution aqueuse de peroxyde d'hydrogène, qui contient du carbonate de métal alcalino-terreux, de préférence du carbonate de magnésium, peut être exposée à de hautes températures. Ce procédé permet de produire des pâtes mécaniques blanchies de bois de conifères et de feuillus présentant un degré élevé de blancheur, un faible jaunissement (b*) et qui foncent moins lorsqu'elles sont exposées à la lumière.
CA002308580A 1998-09-21 1999-03-22 Procede de blanchiment de la pate mecanique Expired - Lifetime CA2308580C (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA002308580A CA2308580C (fr) 1998-09-21 1999-03-22 Procede de blanchiment de la pate mecanique

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
WOPCT/CA98/00918 1998-09-21
PCT/CA1998/000918 WO1999015729A1 (fr) 1997-09-23 1998-09-21 Procede de blanchiment de la pate mecanique
CA002308580A CA2308580C (fr) 1998-09-21 1999-03-22 Procede de blanchiment de la pate mecanique
PCT/CA1999/000239 WO2000017442A1 (fr) 1997-09-23 1999-03-22 Procede de blanchiment de la pate mecanique

Publications (2)

Publication Number Publication Date
CA2308580A1 CA2308580A1 (fr) 2000-03-30
CA2308580C true CA2308580C (fr) 2008-04-15

Family

ID=25681806

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002308580A Expired - Lifetime CA2308580C (fr) 1998-09-21 1999-03-22 Procede de blanchiment de la pate mecanique

Country Status (1)

Country Link
CA (1) CA2308580C (fr)

Also Published As

Publication number Publication date
CA2308580A1 (fr) 2000-03-30

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Effective date: 20190322