NO980872L - Method of preventing the accumulation of metals in a closed pulp bleaching process - Google Patents

Method of preventing the accumulation of metals in a closed pulp bleaching process

Info

Publication number
NO980872L
NO980872L NO980872A NO980872A NO980872L NO 980872 L NO980872 L NO 980872L NO 980872 A NO980872 A NO 980872A NO 980872 A NO980872 A NO 980872A NO 980872 L NO980872 L NO 980872L
Authority
NO
Norway
Prior art keywords
metals
bleaching
accumulation
pulp
preventing
Prior art date
Application number
NO980872A
Other languages
Norwegian (no)
Other versions
NO980872D0 (en
Inventor
Ulf Germgaard
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
Publication of NO980872L publication Critical patent/NO980872L/en
Publication of NO980872D0 publication Critical patent/NO980872D0/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
    • 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

Fremgangsmåte ved bleking av masse, omfattende bleking med pereddik- syre hvor pH-verdien under blekereaksjonen holdes i området 5-7. l sluttfasen av blekingen med pereddiksyre bindes metaller som er frigjort i massen, igjen til fibrene i massen ved økning av pH-verdien til minst 9, hvoretter massen vaskes. pH-verdien økes fortrinnsvis 1-10 minutter før vasking. Det er derved mulig å lukke blekeprosessen i motstrøm uten risiko for akkumulering av metallene i prosessen.Process of bleaching of pulp, comprising bleaching with peracetic acid, wherein the pH during the bleaching reaction is maintained in the range 5-7. In the final phase of the bleaching with peracetic acid, metals released in the pulp are again bonded to the fibers in the pulp by increasing the pH to at least 9, after which the pulp is washed. The pH is preferably increased from 1 to 10 minutes before washing. It is thus possible to close the bleaching process in the countercurrent without the risk of accumulation of the metals in the process.

NO980872A 1995-08-30 1998-02-27 Method of preventing the accumulation of metals in a closed pulp bleaching process NO980872D0 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9503004A SE9503004L (en) 1995-08-30 1995-08-30 Bleaching of pulp
PCT/SE1996/000997 WO1997008381A1 (en) 1995-08-30 1996-08-09 Method for preventing accumulation of metals in a closed pulp bleaching process

Publications (2)

Publication Number Publication Date
NO980872L true NO980872L (en) 1998-02-27
NO980872D0 NO980872D0 (en) 1998-02-27

Family

ID=20399329

Family Applications (1)

Application Number Title Priority Date Filing Date
NO980872A NO980872D0 (en) 1995-08-30 1998-02-27 Method of preventing the accumulation of metals in a closed pulp bleaching process

Country Status (7)

Country Link
EP (1) EP0847460A1 (en)
AU (1) AU6892696A (en)
BR (1) BR9610198A (en)
CA (1) CA2229893A1 (en)
NO (1) NO980872D0 (en)
SE (1) SE9503004L (en)
WO (1) WO1997008381A1 (en)

Families Citing this family (4)

* 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
SE511794C2 (en) * 1997-06-30 1999-11-29 Sunds Defibrator Ind Ab Ways to reduce the content of calcium in the liquid phase in a pulp suspension
WO1999027178A1 (en) * 1997-11-25 1999-06-03 Amylum Belgium N.V. Improvements to the bleaching process for chemical pulp and intermediate pulp dispersions
FI117337B (en) * 2004-12-16 2006-09-15 Kemira Oyj A method for removing manganese from water

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE9301160L (en) * 1992-08-28 1994-03-01 Sunds Defibrator Ind Ab Process for treating process water
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
CA2229893A1 (en) 1997-03-06
WO1997008381A1 (en) 1997-03-06
BR9610198A (en) 1999-06-29
AU6892696A (en) 1997-03-19
SE9503004D0 (en) 1995-08-30
EP0847460A1 (en) 1998-06-17
NO980872D0 (en) 1998-02-27
SE9503004L (en) 1997-03-01

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