SE9203121L - Bleaching of sulfate pulp with peroxide-ozone-peroxide - Google Patents

Bleaching of sulfate pulp with peroxide-ozone-peroxide

Info

Publication number
SE9203121L
SE9203121L SE9203121A SE9203121A SE9203121L SE 9203121 L SE9203121 L SE 9203121L SE 9203121 A SE9203121 A SE 9203121A SE 9203121 A SE9203121 A SE 9203121A SE 9203121 L SE9203121 L SE 9203121L
Authority
SE
Sweden
Prior art keywords
peroxide
pulp
bleaching
ozone
sulfate pulp
Prior art date
Application number
SE9203121A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE9203121D0 (en
SE500335C2 (en
Inventor
Goeran Annergren
Maria Lundin
Staffan Berg
Original Assignee
Sca Wifsta Oestrand 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 Sca Wifsta Oestrand Ab filed Critical Sca Wifsta Oestrand Ab
Priority to SE9203121A priority Critical patent/SE500335C2/en
Publication of SE9203121D0 publication Critical patent/SE9203121D0/en
Priority to AU54001/94A priority patent/AU5400194A/en
Priority to PCT/SE1993/000867 priority patent/WO1994010378A1/en
Publication of SE9203121L publication Critical patent/SE9203121L/en
Publication of SE500335C2 publication Critical patent/SE500335C2/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
    • D21C9/16—Bleaching ; Apparatus therefor with per compounds
    • 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
    • D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
    • D21C9/153—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications with ozone

Landscapes

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

Abstract

The present invention relates to a process for bleaching alkaline sulphate pulp which, in a previous step, has been delignified and bleached to a lignin content of below about 1,3 % (kappa value 9,4). The process is performed by adding peroxide to bleach the pulp in a first step, whereupon to the pulp gaseous ozone is added in an amount of less than 0,5 kg/ton pulp in a second step and that the pulp, possibly without any intermediate wash, is alkalized and peroxide added for final bleaching in a third step.
SE9203121A 1992-10-26 1992-10-26 Bleaching of sulfate pulp with peroxide-ozone-peroxide SE500335C2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE9203121A SE500335C2 (en) 1992-10-26 1992-10-26 Bleaching of sulfate pulp with peroxide-ozone-peroxide
AU54001/94A AU5400194A (en) 1992-10-26 1993-10-25 Bleaching method for alkaline sulphate pulp
PCT/SE1993/000867 WO1994010378A1 (en) 1992-10-26 1993-10-25 Bleaching method for alkaline sulphate pulp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9203121A SE500335C2 (en) 1992-10-26 1992-10-26 Bleaching of sulfate pulp with peroxide-ozone-peroxide

Publications (3)

Publication Number Publication Date
SE9203121D0 SE9203121D0 (en) 1992-10-26
SE9203121L true SE9203121L (en) 1994-04-27
SE500335C2 SE500335C2 (en) 1994-06-06

Family

ID=20387555

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9203121A SE500335C2 (en) 1992-10-26 1992-10-26 Bleaching of sulfate pulp with peroxide-ozone-peroxide

Country Status (3)

Country Link
AU (1) AU5400194A (en)
SE (1) SE500335C2 (en)
WO (1) WO1994010378A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE9402542D0 (en) * 1994-07-20 1994-07-20 Kvaerner Pulping Tech Method and apparatus for bleaching with pressurized peroxide

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT380496B (en) * 1984-06-27 1986-05-26 Steyrermuehl Papier METHOD AND REACTOR FOR DELIGNIFYING CELLULAR WITH OXYGEN
AU636173B2 (en) * 1989-10-30 1993-04-22 Lenzing Aktiengesellschaft Method for the chlorine-free bleaching of pulps
AT395028B (en) * 1990-02-07 1992-08-25 Chemiefaser Lenzing Ag METHOD FOR CHLORINE-FREE BLEACHING OF FIBER FIBER

Also Published As

Publication number Publication date
AU5400194A (en) 1994-05-24
WO1994010378A1 (en) 1994-05-11
SE9203121D0 (en) 1992-10-26
SE500335C2 (en) 1994-06-06

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