CA2219767A1 - Traitement de pate a papier avec un agent chelateur suivi d'un blanchiment a un ph superieur a 9 - Google Patents

Traitement de pate a papier avec un agent chelateur suivi d'un blanchiment a un ph superieur a 9 Download PDF

Info

Publication number
CA2219767A1
CA2219767A1 CA002219767A CA2219767A CA2219767A1 CA 2219767 A1 CA2219767 A1 CA 2219767A1 CA 002219767 A CA002219767 A CA 002219767A CA 2219767 A CA2219767 A CA 2219767A CA 2219767 A1 CA2219767 A1 CA 2219767A1
Authority
CA
Canada
Prior art keywords
pulp
chelating agent
bleaching
hydrogen peroxide
treatment
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
CA002219767A
Other languages
English (en)
Inventor
Ulf Germgard
Rolf Boman
Jonas Lindquist
Kenneth Hafvenstrom
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet AB
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2219767A1 publication Critical patent/CA2219767A1/fr
Abandoned legal-status Critical Current

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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

Landscapes

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

Abstract

Cette invention concerne un procédé de blanchiment sans chlore de pâte à papier constituée de matière ligno-cellulosique, ledit procédé consistant à traiter la pâte avec un agent chélateur et à procéder ensuite à son blanchiment, en au moins une étape, avec des agents de blanchiment ne contenant pas de chlore. Conformément à ce procédé, le PH est maintenu à une valeur supérieure à 9 lors de l'étape de traitement par l'agent chélateur et au cours des étapes ultérieures de blanchiment.
CA002219767A 1995-05-02 1996-03-27 Traitement de pate a papier avec un agent chelateur suivi d'un blanchiment a un ph superieur a 9 Abandoned CA2219767A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9501623A SE9501623L (sv) 1995-05-02 1995-05-02 Blekning av massa
SE9501623-4 1995-05-02

Publications (1)

Publication Number Publication Date
CA2219767A1 true CA2219767A1 (fr) 1996-11-07

Family

ID=20398166

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002219767A Abandoned CA2219767A1 (fr) 1995-05-02 1996-03-27 Traitement de pate a papier avec un agent chelateur suivi d'un blanchiment a un ph superieur a 9

Country Status (6)

Country Link
JP (1) JPH11504399A (fr)
CA (1) CA2219767A1 (fr)
FI (1) FI974115A7 (fr)
NO (1) NO975038D0 (fr)
SE (1) SE9501623L (fr)
WO (1) WO1996035015A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE509444C2 (sv) * 1997-05-14 1999-01-25 Mo Och Domsjoe Ab Förfarande för minimering av kalcium orsakat inkrustproblem vid framställning av blekt cellulosamassa
AU5657098A (en) * 1997-11-25 1999-06-15 Amylum Belgium N.V. Improvements to the bleaching process for chemical pulp and intermediate pulp dispersions
BE1011785A3 (fr) * 1998-03-10 2000-01-11 Solvay Procede de blanchiment et/ou de delignification de pates a papier chimiques.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69306974T3 (de) * 1992-11-27 2004-01-08 Eka Chemicals Ab Verfahren zur deligrifizierung von lignocellulosehaltigem zellstoff
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
JPH11504399A (ja) 1999-04-20
SE9501623L (sv) 1996-11-03
NO975038L (no) 1997-10-31
WO1996035015A1 (fr) 1996-11-07
SE9501623D0 (sv) 1995-05-02
FI974115L (fi) 1997-11-03
NO975038D0 (no) 1997-10-31
FI974115A0 (fi) 1997-11-03
FI974115A7 (fi) 1997-11-03

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Legal Events

Date Code Title Description
FZDE Discontinued