SE9601938L - Sequential pretreatment for bleaching - Google Patents

Sequential pretreatment for bleaching

Info

Publication number
SE9601938L
SE9601938L SE9601938A SE9601938A SE9601938L SE 9601938 L SE9601938 L SE 9601938L SE 9601938 A SE9601938 A SE 9601938A SE 9601938 A SE9601938 A SE 9601938A SE 9601938 L SE9601938 L SE 9601938L
Authority
SE
Sweden
Prior art keywords
bleaching
pulp
organic compound
acid
inorganic
Prior art date
Application number
SE9601938A
Other languages
Swedish (sv)
Other versions
SE517145C2 (en
SE9601938D0 (en
Inventor
Arne Lindahl
Original Assignee
Arne Lindahl
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 Arne Lindahl filed Critical Arne Lindahl
Priority to SE9601938A priority Critical patent/SE517145C2/en
Publication of SE9601938D0 publication Critical patent/SE9601938D0/en
Publication of SE9601938L publication Critical patent/SE9601938L/en
Publication of SE517145C2 publication Critical patent/SE517145C2/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
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1042—Use of chelating agents
    • 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
    • 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

Landscapes

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

Abstract

A method for bleaching lignocellulosic material (pulp), in which heavy metals are removed before bleaching comprises treatment of the pulp with an inorganic and an organic compound. Preferably chloride and/or sulphate ions (e.g. calcium chloride) are used as the inorganic compound, whilst the organic compound is an acid (e.g. malonic acid, tartaric acid or citric acid) or even a nitrogen-containing chelating agent. Pulp is treated with the inorganic compound in a first step separate from the second step for treatment with the organic compound.
SE9601938A 1996-05-22 1996-05-22 Removal of heavy metal ions from pulp before oxidative bleaching SE517145C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE9601938A SE517145C2 (en) 1996-05-22 1996-05-22 Removal of heavy metal ions from pulp before oxidative bleaching

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9601938A SE517145C2 (en) 1996-05-22 1996-05-22 Removal of heavy metal ions from pulp before oxidative bleaching

Publications (3)

Publication Number Publication Date
SE9601938D0 SE9601938D0 (en) 1996-05-22
SE9601938L true SE9601938L (en) 1997-11-23
SE517145C2 SE517145C2 (en) 2002-04-23

Family

ID=20402645

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9601938A SE517145C2 (en) 1996-05-22 1996-05-22 Removal of heavy metal ions from pulp before oxidative bleaching

Country Status (1)

Country Link
SE (1) SE517145C2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6199243B2 (en) * 2014-06-12 2017-09-20 ユニ・チャーム株式会社 Method for producing recycled pulp from used sanitary products

Also Published As

Publication number Publication date
SE517145C2 (en) 2002-04-23
SE9601938D0 (en) 1996-05-22

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Legal Events

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