SE9503764L - Ways of mass bleaching - Google Patents

Ways of mass bleaching

Info

Publication number
SE9503764L
SE9503764L SE9503764A SE9503764A SE9503764L SE 9503764 L SE9503764 L SE 9503764L SE 9503764 A SE9503764 A SE 9503764A SE 9503764 A SE9503764 A SE 9503764A SE 9503764 L SE9503764 L SE 9503764L
Authority
SE
Sweden
Prior art keywords
bleaching
acidic
alkaline
stage
ways
Prior art date
Application number
SE9503764A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE516219C2 (en
SE9503764D0 (en
Inventor
Petter Tibbling
Erik Nilsson
Original Assignee
Kvaerner Pulping Tech
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 Kvaerner Pulping Tech filed Critical Kvaerner Pulping Tech
Priority to SE9503764A priority Critical patent/SE516219C2/en
Publication of SE9503764D0 publication Critical patent/SE9503764D0/en
Priority to PCT/SE1996/001295 priority patent/WO1997015714A1/en
Publication of SE9503764L publication Critical patent/SE9503764L/en
Publication of SE516219C2 publication Critical patent/SE516219C2/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
    • D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
    • 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
    • D21C9/1026—Other features in bleaching processes
    • 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
    • D21C9/1084—Bleaching ; Apparatus therefor with reducing 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

Landscapes

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

Abstract

Method of bleaching chemical paper pulp, in a manner which is preferably entirely chlorine-free, in a bleaching sequence which includes at least one acidic, sulphite-containing, reducing bleaching stage, which bleaching stage is carried out, under conditions which are in the main sulphonating, to a degree of sulphonation which exceeds 10 %. One or two oxidising bleaching stages follow(s) directly thereafter, without intervening washes. If single, this oxidizing bleaching stage can be acidic or alkaline; if there are two oxidizing bleaching stages, the first can be acidic and the second alkaline.
SE9503764A 1995-10-26 1995-10-26 Bleaching of chemical paper pulp in a sulfonating step and an acid oxygen delignification step SE516219C2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SE9503764A SE516219C2 (en) 1995-10-26 1995-10-26 Bleaching of chemical paper pulp in a sulfonating step and an acid oxygen delignification step
PCT/SE1996/001295 WO1997015714A1 (en) 1995-10-26 1996-10-11 Bleaching sequence for chemical paper pulp including sulphonating and oxidising bleaching stages

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9503764A SE516219C2 (en) 1995-10-26 1995-10-26 Bleaching of chemical paper pulp in a sulfonating step and an acid oxygen delignification step

Publications (3)

Publication Number Publication Date
SE9503764D0 SE9503764D0 (en) 1995-10-26
SE9503764L true SE9503764L (en) 1997-04-27
SE516219C2 SE516219C2 (en) 2001-12-03

Family

ID=20399965

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9503764A SE516219C2 (en) 1995-10-26 1995-10-26 Bleaching of chemical paper pulp in a sulfonating step and an acid oxygen delignification step

Country Status (2)

Country Link
SE (1) SE516219C2 (en)
WO (1) WO1997015714A1 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1004630A3 (en) * 1990-10-17 1992-12-22 Interox Internat Sa Method for preservation of strength characteristics of paper pulp chemicals.
SE502135C2 (en) * 1994-08-16 1995-08-28 Kvaerner Pulping Tech Chemical pulp bleaching sequence comprising a sulfonating bleaching step

Also Published As

Publication number Publication date
WO1997015714A1 (en) 1997-05-01
SE516219C2 (en) 2001-12-03
SE9503764D0 (en) 1995-10-26

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Legal Events

Date Code Title Description
NUG Patent has lapsed