SE9501623L - Bleaching of pulp - Google Patents

Bleaching of pulp

Info

Publication number
SE9501623L
SE9501623L SE9501623A SE9501623A SE9501623L SE 9501623 L SE9501623 L SE 9501623L SE 9501623 A SE9501623 A SE 9501623A SE 9501623 A SE9501623 A SE 9501623A SE 9501623 L SE9501623 L SE 9501623L
Authority
SE
Sweden
Prior art keywords
bleaching
pulp
chelating agent
chlorine
subsequent
Prior art date
Application number
SE9501623A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE9501623D0 (en
Inventor
Ulf Germgaard
Rolf Boman
Kenneth Hafvenstroem
Jonas Lindquist
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 SE9501623A priority Critical patent/SE9501623L/en
Publication of SE9501623D0 publication Critical patent/SE9501623D0/en
Priority to CA002219767A priority patent/CA2219767A1/en
Priority to PCT/SE1996/000405 priority patent/WO1996035015A1/en
Priority to JP8533220A priority patent/JPH11504399A/en
Publication of SE9501623L publication Critical patent/SE9501623L/en
Priority to NO975038A priority patent/NO975038L/en
Priority to FI974115A priority patent/FI974115A0/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
    • D21C9/1005—Pretreatment of the pulp, e.g. degassing the pulp
    • 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
    • D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes

Abstract

A method of chlorine free bleaching of pulp of lignocellulosic material, comprising chelating agent treatment of the pulp and subsequent bleaching in at least one step with chlorine-free bleaching agents. According to the method, the pH value is held above 9 both in the chelating agent step and in subsequent bleaching steps.
SE9501623A 1995-05-02 1995-05-02 Bleaching of pulp SE9501623L (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
SE9501623A SE9501623L (en) 1995-05-02 1995-05-02 Bleaching of pulp
CA002219767A CA2219767A1 (en) 1995-05-02 1996-03-27 Treatment of pulp with chelating agent and subsequent bleaching at a ph value above 9
PCT/SE1996/000405 WO1996035015A1 (en) 1995-05-02 1996-03-27 TREATMENT OF PULP WITH CHELATING AGENT AND SUBSEQUENT BLEACHING AT A pH VALUE ABOVE 9
JP8533220A JPH11504399A (en) 1995-05-02 1996-03-27 Treatment of the pulp with a chelating agent followed by bleaching at a pH higher than 9
NO975038A NO975038L (en) 1995-05-02 1997-10-31 Treatment of pulp with chelating agent and subsequent bleaching at a pH above 9
FI974115A FI974115A0 (en) 1995-05-02 1997-11-03 Treatment of pulp with a chelating agent and subsequent bleaching at a pH above 9

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9501623A SE9501623L (en) 1995-05-02 1995-05-02 Bleaching of pulp

Publications (2)

Publication Number Publication Date
SE9501623D0 SE9501623D0 (en) 1995-05-02
SE9501623L true SE9501623L (en) 1996-11-03

Family

ID=20398166

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9501623A SE9501623L (en) 1995-05-02 1995-05-02 Bleaching of pulp

Country Status (6)

Country Link
JP (1) JPH11504399A (en)
CA (1) CA2219767A1 (en)
FI (1) FI974115A0 (en)
NO (1) NO975038L (en)
SE (1) SE9501623L (en)
WO (1) WO1996035015A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE509444C2 (en) * 1997-05-14 1999-01-25 Mo Och Domsjoe Ab Procedure for Minimizing Calcium Caused Incrustation Problems in Preparation of Bleached Cellulose Pulp
EP1036237A1 (en) * 1997-11-25 2000-09-20 Amylum Europe N.V. Improvements to the bleaching process for chemical pulp and intermediate pulp dispersions
BE1011785A3 (en) * 1998-03-10 2000-01-11 Solvay Process for laundering and / or pasta delignification paper chemicals.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2864167B2 (en) * 1992-11-27 1999-03-03 エカ ノーベル アクチェボラーグ Delignification method of pulp containing lignocellulose.
US5554259A (en) * 1993-10-01 1996-09-10 Union Camp Patent Holdings, Inc. Reduction of salt scale precipitation by control of process stream Ph and salt concentration

Also Published As

Publication number Publication date
SE9501623D0 (en) 1995-05-02
WO1996035015A1 (en) 1996-11-07
FI974115A (en) 1997-11-03
CA2219767A1 (en) 1996-11-07
NO975038D0 (en) 1997-10-31
JPH11504399A (en) 1999-04-20
NO975038L (en) 1997-10-31
FI974115A0 (en) 1997-11-03

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Legal Events

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