SE8106334L - SETTLE TO TREAT CELLULOSIC MATERIAL - Google Patents

SETTLE TO TREAT CELLULOSIC MATERIAL

Info

Publication number
SE8106334L
SE8106334L SE8106334A SE8106334A SE8106334L SE 8106334 L SE8106334 L SE 8106334L SE 8106334 A SE8106334 A SE 8106334A SE 8106334 A SE8106334 A SE 8106334A SE 8106334 L SE8106334 L SE 8106334L
Authority
SE
Sweden
Prior art keywords
phase
chlorine
settle
bleaching
cellulosic material
Prior art date
Application number
SE8106334A
Other languages
Unknown language ( )
Swedish (sv)
Inventor
G E Annergren
P-O Lindblad
L-A T Lindstrom
Original Assignee
Sunds Defibrator
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 Sunds Defibrator filed Critical Sunds Defibrator
Priority to SE8106334A priority Critical patent/SE8106334L/en
Priority to AU88943/82A priority patent/AU539104B2/en
Priority to FI823625A priority patent/FI823625L/en
Priority to BR8206194A priority patent/BR8206194A/en
Priority to NO823559A priority patent/NO823559L/en
Priority to DE19823239811 priority patent/DE3239811A1/en
Publication of SE8106334L publication Critical patent/SE8106334L/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
    • D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
    • D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites
    • D21C9/142—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites with ClO2/Cl2 in a multistage process involving ClO2/Cl2 exclusively

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Paper (AREA)

Abstract

The invention relates to a process for bleaching cellulose-containing material, in detail for bleaching in a multi-stage sequence, in which the first bleaching stage is carried out in two phases, that is to say a first phase with elemental chlorine and a second phase with chlorine dioxide water. One subject of the invention is a reduction in the chlorination of the organic material. According to the invention, this is achieved by limiting the proportion of chlorine fed in the first phase in such a way that the end pH in the liquid of the chlorine phase exceeds 3.0.
SE8106334A 1981-10-27 1981-10-27 SETTLE TO TREAT CELLULOSIC MATERIAL SE8106334L (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
SE8106334A SE8106334L (en) 1981-10-27 1981-10-27 SETTLE TO TREAT CELLULOSIC MATERIAL
AU88943/82A AU539104B2 (en) 1981-10-27 1982-09-30 Bleaching cellulose-containing material
FI823625A FI823625L (en) 1981-10-27 1982-10-25 SAETT ATT BEHANDLA CELLULOSAHALTIGT MATERIAL
BR8206194A BR8206194A (en) 1981-10-27 1982-10-25 PROCESSING FOR THE TARGETING OF MATERIAL CONTAINING CELLULOSE
NO823559A NO823559L (en) 1981-10-27 1982-10-26 PROCEDURES FOR TREATMENT OF CELLULOSE-CONTAINING MATERIAL
DE19823239811 DE3239811A1 (en) 1981-10-27 1982-10-27 Process for treating cellulose-containing material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8106334A SE8106334L (en) 1981-10-27 1981-10-27 SETTLE TO TREAT CELLULOSIC MATERIAL

Publications (1)

Publication Number Publication Date
SE8106334L true SE8106334L (en) 1983-04-28

Family

ID=20344893

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8106334A SE8106334L (en) 1981-10-27 1981-10-27 SETTLE TO TREAT CELLULOSIC MATERIAL

Country Status (6)

Country Link
AU (1) AU539104B2 (en)
BR (1) BR8206194A (en)
DE (1) DE3239811A1 (en)
FI (1) FI823625L (en)
NO (1) NO823559L (en)
SE (1) SE8106334L (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5268075A (en) * 1989-10-19 1993-12-07 North Carolina State University High efficiency two-step, high-low pH chlorine dioxide pulp bleaching process
WO1991005909A1 (en) * 1989-10-19 1991-05-02 North Carolina State University High efficiency chlorine dioxide pulp bleaching process

Also Published As

Publication number Publication date
BR8206194A (en) 1983-09-20
DE3239811A1 (en) 1983-05-11
NO823559L (en) 1983-04-28
AU539104B2 (en) 1984-09-13
FI823625L (en) 1983-04-28
AU8894382A (en) 1983-05-19
FI823625A0 (en) 1982-10-25

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