SE9503004L - Bleaching of pulp - Google Patents

Bleaching of pulp

Info

Publication number
SE9503004L
SE9503004L SE9503004A SE9503004A SE9503004L SE 9503004 L SE9503004 L SE 9503004L SE 9503004 A SE9503004 A SE 9503004A SE 9503004 A SE9503004 A SE 9503004A SE 9503004 L SE9503004 L SE 9503004L
Authority
SE
Sweden
Prior art keywords
bleaching
pulp
value
peracetic acid
metals
Prior art date
Application number
SE9503004A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE9503004D0 (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
Priority to SE9503004A priority Critical patent/SE9503004L/en
Publication of SE9503004D0 publication Critical patent/SE9503004D0/en
Priority to BR9610198A priority patent/BR9610198A/en
Priority to PCT/SE1996/000997 priority patent/WO1997008381A1/en
Priority to EP96929609A priority patent/EP0847460A1/en
Priority to CA002229893A priority patent/CA2229893A1/en
Priority to AU68926/96A priority patent/AU6892696A/en
Publication of SE9503004L publication Critical patent/SE9503004L/en
Priority to NO980872A priority patent/NO980872L/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

A method at the bleaching of pulp, comprising bleaching with peracetic acid where the pH value during the bleaching reaction is held within 5-7. In the final phase of the bleaching with peracetic acid, metals released in the pulp are rebound to the fibers in the pulp by increasing the pH value to at least 9, whereafter the pulp is washed. The pH value is increased preferably 1-10 minutes before the washing. It is thereby possible to close the bleaching process in counterflow without risk of accumulation of the metals in the process.
SE9503004A 1995-08-30 1995-08-30 Bleaching of pulp SE9503004L (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
SE9503004A SE9503004L (en) 1995-08-30 1995-08-30 Bleaching of pulp
BR9610198A BR9610198A (en) 1995-08-30 1996-08-09 Pulp bleaching process
PCT/SE1996/000997 WO1997008381A1 (en) 1995-08-30 1996-08-09 Method for preventing accumulation of metals in a closed pulp bleaching process
EP96929609A EP0847460A1 (en) 1995-08-30 1996-08-09 Method for preventing accumulation of metals in a closed pulp bleaching process
CA002229893A CA2229893A1 (en) 1995-08-30 1996-08-09 Method for preventing accumulation of metals in a closed pulp bleaching process
AU68926/96A AU6892696A (en) 1995-08-30 1996-08-09 Method for preventing accumulation of metals in a closed pulp bleaching process
NO980872A NO980872L (en) 1995-08-30 1998-02-27 Method of preventing the accumulation of metals in a closed pulp bleaching process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9503004A SE9503004L (en) 1995-08-30 1995-08-30 Bleaching of pulp

Publications (2)

Publication Number Publication Date
SE9503004D0 SE9503004D0 (en) 1995-08-30
SE9503004L true SE9503004L (en) 1997-03-01

Family

ID=20399329

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9503004A SE9503004L (en) 1995-08-30 1995-08-30 Bleaching of pulp

Country Status (7)

Country Link
EP (1) EP0847460A1 (en)
AU (1) AU6892696A (en)
BR (1) BR9610198A (en)
CA (1) CA2229893A1 (en)
NO (1) NO980872L (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
EP1036237A1 (en) * 1997-11-25 2000-09-20 Amylum Europe 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
BR9610198A (en) 1999-06-29
WO1997008381A1 (en) 1997-03-06
NO980872D0 (en) 1998-02-27
NO980872L (en) 1998-02-27
EP0847460A1 (en) 1998-06-17
CA2229893A1 (en) 1997-03-06
AU6892696A (en) 1997-03-19
SE9503004D0 (en) 1995-08-30

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