SE9700884L - Bleaching with chlorine dioxide in a three-phase step - Google Patents

Bleaching with chlorine dioxide in a three-phase step

Info

Publication number
SE9700884L
SE9700884L SE9700884A SE9700884A SE9700884L SE 9700884 L SE9700884 L SE 9700884L SE 9700884 A SE9700884 A SE 9700884A SE 9700884 A SE9700884 A SE 9700884A SE 9700884 L SE9700884 L SE 9700884L
Authority
SE
Sweden
Prior art keywords
chlorine dioxide
bleaching
pulp
consistency
phase step
Prior art date
Application number
SE9700884A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE9700884D0 (en
SE507164C2 (en
Inventor
Ulf Germgaard
Kjell Forslund
Matts Sundin
Per-Aake Soedersten
Original Assignee
Sunds Defibrator Ind 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 Sunds Defibrator Ind Ab filed Critical Sunds Defibrator Ind Ab
Priority to SE9700884A priority Critical patent/SE507164C2/en
Publication of SE9700884D0 publication Critical patent/SE9700884D0/en
Publication of SE9700884L publication Critical patent/SE9700884L/en
Publication of SE507164C2 publication Critical patent/SE507164C2/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

Landscapes

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

Abstract

A process for bleaching paper pulp using a chlorine dioxide bleaching step has this step separated into the following three stages: (1) gaseous chlorine dioxide is added to the pulp to carry out bleaching at an acidic pH and a pulp consistency of 25-45 ; (2) the pre-bleached pulp is diluted to a consistency of 8-16 % and rendered alkaline to a pH of at least 6; and (3) the alkaline pulp is acidified to give an acidic pH and then bleached at 8-16 % consistency with chlorine dioxide.
SE9700884A 1997-03-12 1997-03-12 Chlorine di:oxide bleaching process for paper pulp SE507164C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE9700884A SE507164C2 (en) 1997-03-12 1997-03-12 Chlorine di:oxide bleaching process for paper pulp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9700884A SE507164C2 (en) 1997-03-12 1997-03-12 Chlorine di:oxide bleaching process for paper pulp

Publications (3)

Publication Number Publication Date
SE9700884D0 SE9700884D0 (en) 1997-03-12
SE9700884L true SE9700884L (en) 1998-04-20
SE507164C2 SE507164C2 (en) 1998-04-20

Family

ID=20406119

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9700884A SE507164C2 (en) 1997-03-12 1997-03-12 Chlorine di:oxide bleaching process for paper pulp

Country Status (1)

Country Link
SE (1) SE507164C2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI122626B (en) * 2006-03-31 2012-04-30 Laennen Tutkimus Western Res Inc Oy Chemical pulp bleaching process
CN103757963B (en) * 2014-01-07 2015-09-16 昆明理工大学 The method of a kind of chlorine dioxide gas phase bleaching jute skin fiber processed

Also Published As

Publication number Publication date
SE9700884D0 (en) 1997-03-12
SE507164C2 (en) 1998-04-20

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