SE9604094L - Bleaching of pulp with chlorine dioxide, alkali and complexing agents without intermediate washes - Google Patents

Bleaching of pulp with chlorine dioxide, alkali and complexing agents without intermediate washes

Info

Publication number
SE9604094L
SE9604094L SE9604094A SE9604094A SE9604094L SE 9604094 L SE9604094 L SE 9604094L SE 9604094 A SE9604094 A SE 9604094A SE 9604094 A SE9604094 A SE 9604094A SE 9604094 L SE9604094 L SE 9604094L
Authority
SE
Sweden
Prior art keywords
pulp
bleaching
chlorine dioxide
alkali
complexing agents
Prior art date
Application number
SE9604094A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE9604094D0 (en
SE507742C2 (en
Inventor
Ulf Germgaard
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 SE9604094A priority Critical patent/SE507742C2/en
Publication of SE9604094D0 publication Critical patent/SE9604094D0/en
Priority to AU49726/97A priority patent/AU4972697A/en
Priority to PCT/SE1997/001810 priority patent/WO1998021400A1/en
Priority to EP97912600A priority patent/EP0937173A1/en
Priority to ZA9709999A priority patent/ZA979999B/en
Priority to IDP973629A priority patent/ID18347A/en
Publication of SE9604094L publication Critical patent/SE9604094L/en
Publication of SE507742C2 publication Critical patent/SE507742C2/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
    • D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
    • D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites
    • D21C9/144—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites with ClO2/Cl2 and other bleaching agents in a multistage process
    • 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

Abstract

A method for bleaching paper making pulp with peroxide with enhanced efficiency for a chelating stage wherein the pulp after digestion, and possibly oxygen bleaching, is subjected to a mild chlorine dioxide treatment at acidic pH, an alkalization and a treatment with chelating agent at a high pH before a peroxide stage.
SE9604094A 1996-11-08 1996-11-08 Bleaching of pulp with chlorine dioxide, alkali and complexing agents without intermediate washes SE507742C2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
SE9604094A SE507742C2 (en) 1996-11-08 1996-11-08 Bleaching of pulp with chlorine dioxide, alkali and complexing agents without intermediate washes
AU49726/97A AU4972697A (en) 1996-11-08 1997-10-29 Prebleaching of paperpulp before a peroxide bleaching stage
PCT/SE1997/001810 WO1998021400A1 (en) 1996-11-08 1997-10-29 Prebleaching of paperpulp before a peroxide bleaching stage
EP97912600A EP0937173A1 (en) 1996-11-08 1997-10-29 Prebleaching of paperpulp before a peroxide bleaching stage
ZA9709999A ZA979999B (en) 1996-11-08 1997-11-06 Method of pulp bleaching.
IDP973629A ID18347A (en) 1996-11-08 1997-11-07 BREEDING WOOD BLEACHING METHOD

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9604094A SE507742C2 (en) 1996-11-08 1996-11-08 Bleaching of pulp with chlorine dioxide, alkali and complexing agents without intermediate washes

Publications (3)

Publication Number Publication Date
SE9604094D0 SE9604094D0 (en) 1996-11-08
SE9604094L true SE9604094L (en) 1998-05-09
SE507742C2 SE507742C2 (en) 1998-07-06

Family

ID=20404541

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9604094A SE507742C2 (en) 1996-11-08 1996-11-08 Bleaching of pulp with chlorine dioxide, alkali and complexing agents without intermediate washes

Country Status (6)

Country Link
EP (1) EP0937173A1 (en)
AU (1) AU4972697A (en)
ID (1) ID18347A (en)
SE (1) SE507742C2 (en)
WO (1) WO1998021400A1 (en)
ZA (1) ZA979999B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6315863B1 (en) * 1998-06-18 2001-11-13 Weyerhaeuser Company Chlorine dioxide pulp bleaching process having reduced barium scaling by recycling post-chlorination waste filtrate
AU5317700A (en) * 1999-06-08 2000-12-28 Eastern Pulp And Paper Corporation Bleaching pulp with high-pressure O2
SE0200981D0 (en) * 2002-03-28 2002-03-28 Eka Chemicals Ab Process for bleaching lignocellulose-containing non-wood pulp
FI123102B (en) * 2006-03-31 2012-11-15 Laennen Tutkimus Western Res Inc Oy Chemical pulp bleaching process

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE502706E (en) * 1994-04-05 1999-06-18 Mo Och Domsjoe Ab Preparation of bleached cellulose pulp by bleaching with chlorine dioxide and treatment of complexing agents in the same step
SE514697C2 (en) * 1994-08-31 2001-04-02 Valmet Fibertech Ab Elimination of metal ions in pulp bleaching
WO1996025552A1 (en) * 1995-02-17 1996-08-22 Ahlstrom Machinery Oy Method of pretreating pulp to be bleached with peroxide

Also Published As

Publication number Publication date
WO1998021400A1 (en) 1998-05-22
ID18347A (en) 1998-04-02
EP0937173A1 (en) 1999-08-25
SE9604094D0 (en) 1996-11-08
ZA979999B (en) 1998-06-25
AU4972697A (en) 1998-06-03
SE507742C2 (en) 1998-07-06

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