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NO971536L - Treatment of chemical pulp with a chelating agent and an oxidizing agent in connection with bleaching - Google Patents

Treatment of chemical pulp with a chelating agent and an oxidizing agent in connection with bleaching

Info

Publication number
NO971536L
NO971536L NO971536A NO971536A NO971536L NO 971536 L NO971536 L NO 971536L NO 971536 A NO971536 A NO 971536A NO 971536 A NO971536 A NO 971536A NO 971536 L NO971536 L NO 971536L
Authority
NO
Norway
Prior art keywords
treatment
chelating agent
bleaching
agent
connection
Prior art date
Application number
NO971536A
Other languages
Norwegian (no)
Other versions
NO971536D0 (en
Inventor
Ulf Germgaard
Kenneth Hafvenstroem
Rolf Boman
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 NO971536D0 publication Critical patent/NO971536D0/en
Publication of NO971536L publication Critical patent/NO971536L/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

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Detergent Compositions (AREA)
  • Plural Heterocyclic Compounds (AREA)
  • Nitrogen Condensed Heterocyclic Rings (AREA)
  • Pyrrole Compounds (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Abstract

Fremgangsmåte for klorfri bleking av masse, hvor metallene i massen fjernes ved hjelp av et chelateringsmiddel. Massen behandles med chelateringsmid- let ved en pH-verdi på 2-7 i en lidspehode på fra 5 minutter tir2 timer. Chelate- ringsmidlet aktiveres ved tilsetning av et oksydasjonsmiddel. Etter behandlingen vaskes massen.Process for chlorine-free bleaching of pulp, wherein the metals in the pulp are removed by a chelating agent. The pulp is treated with the chelating agent at a pH of 2-7 in a spoon head of from 5 minutes to 2 hours. The chelating agent is activated by the addition of an oxidizing agent. After treatment, the pulp is washed.

NO971536A 1994-10-07 1997-04-04 Treatment of chemical pulp with a chelating agent and an oxidizing agent in connection with bleaching NO971536L (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9403396A SE504826C2 (en) 1994-10-07 1994-10-07 Treatment of chemical pulp with complexing agents in the presence of an oxidizing agent
PCT/SE1995/001135 WO1996011298A1 (en) 1994-10-07 1995-10-05 Treatment of chemical pulp with a chelating agent and an oxidizing agent in connection with bleaching

Publications (2)

Publication Number Publication Date
NO971536D0 NO971536D0 (en) 1997-04-04
NO971536L true NO971536L (en) 1997-04-04

Family

ID=20395512

Family Applications (1)

Application Number Title Priority Date Filing Date
NO971536A NO971536L (en) 1994-10-07 1997-04-04 Treatment of chemical pulp with a chelating agent and an oxidizing agent in connection with bleaching

Country Status (10)

Country Link
EP (1) EP0784720A1 (en)
JP (1) JPH10506965A (en)
CN (1) CN1159842A (en)
AU (1) AU686024B2 (en)
BR (1) BR9509253A (en)
CA (1) CA2199257A1 (en)
FI (1) FI971401L (en)
NO (1) NO971536L (en)
SE (1) SE504826C2 (en)
WO (1) WO1996011298A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1010678A3 (en) * 1996-10-11 1998-11-03 Solvay Interox Method for the delignification and bleaching of a chemical paper pulp
ES2171926T3 (en) * 1996-09-11 2002-09-16 Solvay Interox Sa PAPER PASTE WHITENING PROCEDURE.
BE1010617A3 (en) * 1996-09-11 1998-11-03 Solvay Interox Paper pulp bleaching method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE420430B (en) * 1978-02-17 1981-10-05 Mo Och Domsjoe Ab PROCEDURE FOR WHEATING AND EXTRACTION OF LIGNOCELLULOSALLY MATERIALS WITH PEROXID CONTAINING BLACKS
DE402335T1 (en) * 1989-06-06 1992-04-09 Eka Nobel Ab, Surte METHOD FOR BLEACHING LIGNOCELLULOSE-CONTAINING CELLS.

Also Published As

Publication number Publication date
NO971536D0 (en) 1997-04-04
FI971401A0 (en) 1997-04-04
SE9403396D0 (en) 1994-10-07
BR9509253A (en) 1997-10-21
EP0784720A1 (en) 1997-07-23
FI971401A7 (en) 1997-04-04
WO1996011298A1 (en) 1996-04-18
CN1159842A (en) 1997-09-17
AU686024B2 (en) 1998-01-29
FI971401L (en) 1997-04-04
SE504826C2 (en) 1997-05-12
AU3712495A (en) 1996-05-02
JPH10506965A (en) 1998-07-07
SE9403396L (en) 1996-04-08
CA2199257A1 (en) 1996-04-18

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