GB1062734A - Improvements in or relating to bleaching cellulose pulp - Google Patents

Improvements in or relating to bleaching cellulose pulp

Info

Publication number
GB1062734A
GB1062734A GB1148364A GB1148364A GB1062734A GB 1062734 A GB1062734 A GB 1062734A GB 1148364 A GB1148364 A GB 1148364A GB 1148364 A GB1148364 A GB 1148364A GB 1062734 A GB1062734 A GB 1062734A
Authority
GB
United Kingdom
Prior art keywords
bleaching
washed
bleached
pulp
cellulose pulp
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
Application number
GB1148364A
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.)
Mo och Domsjo AB
Original Assignee
Mo och Domsjo 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 Domsjo AB filed Critical Mo och Domsjo AB
Publication of GB1062734A publication Critical patent/GB1062734A/en
Expired legal-status Critical Current

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
    • D21C9/1047—Conserving the bleached pulp

Landscapes

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

Abstract

The resistance to brightness reversion and degradation in the ageing of bleached cellulose pulp e.g. sulphate pulp and sulphite pulp, is increased by treating it for 1-6 hours with water or an aqueous solution of a mineral acid or an alkali, the concentration of which is such that the pH of the solution is between 2 and 12, at a temperature above 80 DEG C. prior to or after bleaching or as an intermediate step between any of the bleaching steps in the bleaching procedure. A major proportion of the lignin may be removed prior to the treatment. In a preferred process the cellulosic material may be cooked, washed, screened, chlorinated, washed with alkali and bleached with hypochlorite in a first step and then washed, treated with water and finally bleached with chlorine dioxide in two steps with an intermediate alkaline treatment.
GB1148364A 1963-03-21 1964-03-18 Improvements in or relating to bleaching cellulose pulp Expired GB1062734A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE311563 1963-03-21

Publications (1)

Publication Number Publication Date
GB1062734A true GB1062734A (en) 1967-03-22

Family

ID=20261429

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1148364A Expired GB1062734A (en) 1963-03-21 1964-03-18 Improvements in or relating to bleaching cellulose pulp

Country Status (3)

Country Link
CH (1) CH440945A (en)
FI (1) FI42785B (en)
GB (1) GB1062734A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0856080A1 (en) 1995-10-20 1998-08-05 Ahlstrom Machinery Oy Acid treatment of pulp at high temperature in connection with bleaching
US6736934B1 (en) 1995-02-17 2004-05-18 Andritz Oy Method of pretreating pulp in an acid tower prior to bleaching with peroxide
WO2006091140A1 (en) * 2005-02-24 2006-08-31 Gl&V Management Hungary Kft Method for treatment of bleached chemical pulp
US8920603B2 (en) 2006-10-11 2014-12-30 Akzo Nobel N.V. Bleaching of pulp

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6736934B1 (en) 1995-02-17 2004-05-18 Andritz Oy Method of pretreating pulp in an acid tower prior to bleaching with peroxide
EP0856080A1 (en) 1995-10-20 1998-08-05 Ahlstrom Machinery Oy Acid treatment of pulp at high temperature in connection with bleaching
US6306253B2 (en) 1995-10-20 2001-10-23 Andritz-Ahlstrom Oy Acid treatment of pulp at high temperature prior to chlorine dioxide bleaching
WO2006091140A1 (en) * 2005-02-24 2006-08-31 Gl&V Management Hungary Kft Method for treatment of bleached chemical pulp
US8920603B2 (en) 2006-10-11 2014-12-30 Akzo Nobel N.V. Bleaching of pulp

Also Published As

Publication number Publication date
FI42785B (en) 1970-06-30
CH440945A (en) 1967-07-31

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