CA2229893A1 - Procede pour empecher l'accumulation de metaux dans un processus de blanchiment de pate a papier en circuit ferme - Google Patents

Procede pour empecher l'accumulation de metaux dans un processus de blanchiment de pate a papier en circuit ferme Download PDF

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Publication number
CA2229893A1
CA2229893A1 CA002229893A CA2229893A CA2229893A1 CA 2229893 A1 CA2229893 A1 CA 2229893A1 CA 002229893 A CA002229893 A CA 002229893A CA 2229893 A CA2229893 A CA 2229893A CA 2229893 A1 CA2229893 A1 CA 2229893A1
Authority
CA
Canada
Prior art keywords
bleaching
pulp
metals
peracetic acid
value
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
CA002229893A
Other languages
English (en)
Inventor
Jonas Lindquist
Ulf Germgard
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 CA2229893A1 publication Critical patent/CA2229893A1/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
    • 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
    • D21C9/166—Bleaching ; Apparatus therefor with per compounds with peracids

Landscapes

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

Abstract

L'invention concerne un procédé pour blanchir la pâte à papier, consistant à effectuer ce blanchiment à l'acide peracétique, la valeur du pH durant la réaction de blanchiment étant maintenue à 5-7. Dans la phase finale du blanchiment à l'acide peracétique, les métaux libérés dans la pâte sont fixés à nouveau aux fibres de la pâte, par une augmentation de la valeur du pH à au moins 9. La pâte est ensuite lavée. La valeur de pH est augmentée de préférence 1-10 minutes avant le lavage. Il est ainsi possible de mettre le processus de blanchiment à contre-courant en circuit fermé, sans risque d'accumulation des métaux dans ce processus.
CA002229893A 1995-08-30 1996-08-09 Procede pour empecher l'accumulation de metaux dans un processus de blanchiment de pate a papier en circuit ferme Abandoned CA2229893A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9503004-5 1995-08-30
SE9503004A SE9503004L (sv) 1995-08-30 1995-08-30 Blekning av massa
PCT/SE1996/000997 WO1997008381A1 (fr) 1995-08-30 1996-08-09 Procede pour empecher l'accumulation de metaux dans un processus de blanchiment de pate a papier en circuit ferme

Publications (1)

Publication Number Publication Date
CA2229893A1 true CA2229893A1 (fr) 1997-03-06

Family

ID=20399329

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002229893A Abandoned CA2229893A1 (fr) 1995-08-30 1996-08-09 Procede pour empecher l'accumulation de metaux dans un processus de blanchiment de pate a papier en circuit ferme

Country Status (7)

Country Link
EP (1) EP0847460A1 (fr)
AU (1) AU6892696A (fr)
BR (1) BR9610198A (fr)
CA (1) CA2229893A1 (fr)
NO (1) NO980872L (fr)
SE (1) SE9503004L (fr)
WO (1) WO1997008381A1 (fr)

Families Citing this family (4)

* 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
SE511794C2 (sv) * 1997-06-30 1999-11-29 Sunds Defibrator Ind Ab Sätt att reducera halten kalcium i vätskefasen i en pappersmassasuspension
EP1036237A1 (fr) * 1997-11-25 2000-09-20 Amylum Europe N.V. Perfectionnements apportes au procede de blanchiment de la pate chimique et dispersions intermediaires de pate
FI117337B (fi) * 2004-12-16 2006-09-15 Kemira Oyj Menetelmä mangaanin poistamiseksi vedestä

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE9301160L (sv) * 1992-08-28 1994-03-01 Sunds Defibrator Ind Ab Förfarande för behandling av processvatten
PL309190A1 (en) * 1992-11-27 1995-09-18 Eka Nobel Ab Method of bleaching a lignocellulose containing pulp
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
BR9610198A (pt) 1999-06-29
WO1997008381A1 (fr) 1997-03-06
NO980872D0 (no) 1998-02-27
NO980872L (no) 1998-02-27
EP0847460A1 (fr) 1998-06-17
AU6892696A (en) 1997-03-19
SE9503004D0 (sv) 1995-08-30
SE9503004L (sv) 1997-03-01

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Legal Events

Date Code Title Description
FZDE Discontinued