SE9303551L - Ways to treat chemical pulp without the use of chlorine-containing chemicals - Google Patents

Ways to treat chemical pulp without the use of chlorine-containing chemicals

Info

Publication number
SE9303551L
SE9303551L SE9303551A SE9303551A SE9303551L SE 9303551 L SE9303551 L SE 9303551L SE 9303551 A SE9303551 A SE 9303551A SE 9303551 A SE9303551 A SE 9303551A SE 9303551 L SE9303551 L SE 9303551L
Authority
SE
Sweden
Prior art keywords
stage
chlorine
ways
bleaching
chemical pulp
Prior art date
Application number
SE9303551A
Other languages
Swedish (sv)
Other versions
SE512491C2 (en
SE9303551D0 (en
Inventor
Anders Bergqvist
Haakan Dahlloef
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 SE9303551A priority Critical patent/SE512491C2/en
Publication of SE9303551D0 publication Critical patent/SE9303551D0/en
Priority to US08/218,647 priority patent/US6605181B1/en
Priority to AU78260/94A priority patent/AU7826094A/en
Priority to BR9407668A priority patent/BR9407668A/en
Priority to PCT/SE1994/000889 priority patent/WO1995009945A1/en
Publication of SE9303551L publication Critical patent/SE9303551L/en
Priority to FI961419A priority patent/FI961419A0/en
Publication of SE512491C2 publication Critical patent/SE512491C2/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
    • D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
    • D21C9/04—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents in diffusers ; Washing of pulp of fluid consistency without substantially thickening
    • 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
    • D21C9/1042—Use of chelating agents

Landscapes

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

Abstract

Cooked chemical paper pulp is bleached by treating in (i) a delignifying P stage using a peroxide charge of 2-8 kilos/BDMT (ii) a delignifying acid stage and (iii) a bleaching P stage using at least 3 kilos/BDMT of peroxide and above the amts. used in stage (i). Bleaching apparatus for the process comprising bleaching towers (7,17 and 19) and a washing sequence contg. a displacement wash section and a consistency adjusting wash unit between the towers is also claimed.
SE9303551A 1993-10-01 1993-10-28 Chlorine free bleaching of chemical paper pulps SE512491C2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
SE9303551A SE512491C2 (en) 1993-10-28 1993-10-28 Chlorine free bleaching of chemical paper pulps
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
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
PCT/SE1994/000889 WO1995009945A1 (en) 1993-10-01 1994-09-27 Method of treating chemical paper pulp without using chlorine-containing chemicals
FI961419A FI961419A0 (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
SE9303551A SE512491C2 (en) 1993-10-28 1993-10-28 Chlorine free bleaching of chemical paper pulps

Publications (3)

Publication Number Publication Date
SE9303551D0 SE9303551D0 (en) 1993-10-28
SE9303551L true SE9303551L (en) 1995-04-29
SE512491C2 SE512491C2 (en) 2000-03-27

Family

ID=20391564

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9303551A SE512491C2 (en) 1993-10-01 1993-10-28 Chlorine free bleaching of chemical paper pulps

Country Status (1)

Country Link
SE (1) SE512491C2 (en)

Also Published As

Publication number Publication date
SE512491C2 (en) 2000-03-27
SE9303551D0 (en) 1993-10-28

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