CA2308580A1 - Method for bleaching mechanical pulp - Google Patents

Method for bleaching mechanical pulp Download PDF

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Publication number
CA2308580A1
CA2308580A1 CA002308580A CA2308580A CA2308580A1 CA 2308580 A1 CA2308580 A1 CA 2308580A1 CA 002308580 A CA002308580 A CA 002308580A CA 2308580 A CA2308580 A CA 2308580A CA 2308580 A1 CA2308580 A1 CA 2308580A1
Authority
CA
Canada
Prior art keywords
hydrogen peroxide
mechanical pulp
softwood
hardwood
pulps
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.)
Granted
Application number
CA002308580A
Other languages
French (fr)
Other versions
CA2308580C (en
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
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 PCT/CA1998/000918 external-priority patent/WO1999015729A1/en
Application filed by Individual filed Critical Individual
Priority to CA002308580A priority Critical patent/CA2308580C/en
Priority claimed from PCT/CA1999/000239 external-priority patent/WO2000017442A1/en
Publication of CA2308580A1 publication Critical patent/CA2308580A1/en
Application granted granted Critical
Publication of CA2308580C publication Critical patent/CA2308580C/en
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

A method for bleaching unbleached softwood or hardwood pulps using hydrogen peroxide without added alkali for activation is described. The aqueous hydrogen peroxide solution contains an alkaline earth metal carbonate, preferably magnesium carbonate and can be used at elevated temperatures. Bleached hardwood or softwood mechanical pulps with high brightness, low yellowness (b*) and reduced reversion properties are produced.
CA002308580A 1998-09-21 1999-03-22 Method for bleaching mechanical pulp Expired - Lifetime CA2308580C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA002308580A CA2308580C (en) 1998-09-21 1999-03-22 Method for bleaching mechanical pulp

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
PCT/CA1998/000918 WO1999015729A1 (en) 1997-09-23 1998-09-21 Method for bleaching mechanical pulp
WOPCT/CA98/00918 1998-09-21
CA002308580A CA2308580C (en) 1998-09-21 1999-03-22 Method for bleaching mechanical pulp
PCT/CA1999/000239 WO2000017442A1 (en) 1997-09-23 1999-03-22 Method for bleaching mechanical pulp

Publications (2)

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

Family

ID=25681806

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002308580A Expired - Lifetime CA2308580C (en) 1998-09-21 1999-03-22 Method for bleaching mechanical pulp

Country Status (1)

Country Link
CA (1) CA2308580C (en)

Also Published As

Publication number Publication date
CA2308580C (en) 2008-04-15

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Effective date: 20190322