SE9100744L - Pulp bleaching method - involves multistage bleach sequence using ozone, oxygen@, hydrogen peroxide and chlorine di:oxide or peracetic acid - Google Patents

Pulp bleaching method - involves multistage bleach sequence using ozone, oxygen@, hydrogen peroxide and chlorine di:oxide or peracetic acid

Info

Publication number
SE9100744L
SE9100744L SE9100744A SE9100744A SE9100744L SE 9100744 L SE9100744 L SE 9100744L SE 9100744 A SE9100744 A SE 9100744A SE 9100744 A SE9100744 A SE 9100744A SE 9100744 L SE9100744 L SE 9100744L
Authority
SE
Sweden
Prior art keywords
ozone
pulp
pref
stage
chlorine
Prior art date
Application number
SE9100744A
Other languages
Swedish (sv)
Other versions
SE9100744D0 (en
Inventor
B Boder
Original Assignee
Kamyr 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 Kamyr Ab filed Critical Kamyr Ab
Priority to SE9100744A priority Critical patent/SE9100744L/en
Publication of SE9100744D0 publication Critical patent/SE9100744D0/en
Publication of SE9100744L publication Critical patent/SE9100744L/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
    • D21C9/1057—Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16
    • 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 bleaching sequence consists of a first stage in which ozone is used, a second stage in which the pulp is alkaline-extracted in the presence of oxygen and possibly hydrogen peroxide, and at least one final stage in which chlorine dioxide and/or peracetic acid are applied. Ozone is added in the first stage in an amt. of 1 - 20 kg., pref. 2 - 8 kg per ton of dry pulp, chlorine dioxide, when used, in an amt. of at most 20 kg., pref. at most 15 kgs., dry pulp reckoned as active chlorine, and peracetic acid, when used, in an amt. of at most 30 kg., pref. at most 20 kg per ton of dry pulp. Pulp with a consistency of 6 - 15% is treated with acid and then in the first stage with a oxalic acid ina ddition to ozone, whereby oxalic acid and ozone are added to the pulp when it is in a fluidised state. No washing occurs between the addition of these two agents. Oxalic acid is added in an amt. of 2 - 20 kg., pref. 5 - 10 kg. per ton dry pulp, producing a pulp with a lightness of at least 85% ISO, pref. at least 87% ISO.
SE9100744A 1991-03-12 1991-03-12 Pulp bleaching method - involves multistage bleach sequence using ozone, oxygen@, hydrogen peroxide and chlorine di:oxide or peracetic acid SE9100744L (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE9100744A SE9100744L (en) 1991-03-12 1991-03-12 Pulp bleaching method - involves multistage bleach sequence using ozone, oxygen@, hydrogen peroxide and chlorine di:oxide or peracetic acid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9100744A SE9100744L (en) 1991-03-12 1991-03-12 Pulp bleaching method - involves multistage bleach sequence using ozone, oxygen@, hydrogen peroxide and chlorine di:oxide or peracetic acid

Publications (2)

Publication Number Publication Date
SE9100744D0 SE9100744D0 (en) 1991-03-12
SE9100744L true SE9100744L (en) 1992-09-13

Family

ID=20382144

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9100744A SE9100744L (en) 1991-03-12 1991-03-12 Pulp bleaching method - involves multistage bleach sequence using ozone, oxygen@, hydrogen peroxide and chlorine di:oxide or peracetic acid

Country Status (1)

Country Link
SE (1) SE9100744L (en)

Also Published As

Publication number Publication date
SE9100744D0 (en) 1991-03-12

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