SE9403396L - Bleaching of pulp - Google Patents

Bleaching of pulp

Info

Publication number
SE9403396L
SE9403396L SE9403396A SE9403396A SE9403396L SE 9403396 L SE9403396 L SE 9403396L SE 9403396 A SE9403396 A SE 9403396A SE 9403396 A SE9403396 A SE 9403396A SE 9403396 L SE9403396 L SE 9403396L
Authority
SE
Sweden
Prior art keywords
pulp
bleaching
chelating agent
agent
metals
Prior art date
Application number
SE9403396A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE9403396D0 (en
SE504826C2 (en
Inventor
Ulf Germgaard
Rolf Boman
Kenneth Hafvenstroem
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 SE9403396A priority Critical patent/SE504826C2/en
Publication of SE9403396D0 publication Critical patent/SE9403396D0/en
Priority to EP95934912A priority patent/EP0784720A1/en
Priority to FI971401A priority patent/FI971401L/en
Priority to CA002199257A priority patent/CA2199257A1/en
Priority to CN95195457.1A priority patent/CN1159842A/en
Priority to BR9509253A priority patent/BR9509253A/en
Priority to JP8512520A priority patent/JPH10506965A/en
Priority to AU37124/95A priority patent/AU686024B2/en
Priority to PCT/SE1995/001135 priority patent/WO1996011298A1/en
Publication of SE9403396L publication Critical patent/SE9403396L/en
Priority to NO971536A priority patent/NO971536D0/en
Publication of SE504826C2 publication Critical patent/SE504826C2/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)
  • Nitrogen Condensed Heterocyclic Rings (AREA)
  • Pyrrole Compounds (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Plural Heterocyclic Compounds (AREA)

Abstract

A method of chlorine free bleaching of pulp where the metals in the pulp are removed by means of a chelating agent. The pulp is treated with the chelating agent at a pH 2-7 for a period of 5 minutes to 2 hours. The chelating agent is activated by the addition of an oxidizing agent. After the treatment the pulp is washed.
SE9403396A 1994-10-07 1994-10-07 Treatment of chemical pulp with complexing agents in the presence of an oxidizing agent SE504826C2 (en)

Priority Applications (10)

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
CN95195457.1A CN1159842A (en) 1994-10-07 1995-10-05 Bleaching-related treatment of chemical pulp with chelating agents and oxidizing agents
FI971401A FI971401L (en) 1994-10-07 1995-10-05 Treatment of chemical pulp with a chelating agent and an oxidizing agent during bleaching
CA002199257A CA2199257A1 (en) 1994-10-07 1995-10-05 Treatment of chemical pulp with a chelating agent and an oxidizing agent in connection with bleaching
EP95934912A EP0784720A1 (en) 1994-10-07 1995-10-05 Treatment of chemical pulp with a chelating agent and an oxidizing agent in connection with bleaching
BR9509253A BR9509253A (en) 1994-10-07 1995-10-05 Chlorine-free pulley bleaching process
JP8512520A JPH10506965A (en) 1994-10-07 1995-10-05 Treatment of chemical pulp with chelating and oxidizing agents related to bleaching.
AU37124/95A AU686024B2 (en) 1994-10-07 1995-10-05 Treatment of chemical pulp with a chelating agent and an oxidizing agent in connection with bleaching
NO971536A NO971536D0 (en) 1994-10-07 1997-04-04 Treatment of chemical pulp with a chelating agent and an oxidizing agent in connection with bleaching

Applications Claiming Priority (1)

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

Publications (3)

Publication Number Publication Date
SE9403396D0 SE9403396D0 (en) 1994-10-07
SE9403396L true SE9403396L (en) 1996-04-08
SE504826C2 SE504826C2 (en) 1997-05-12

Family

ID=20395512

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9403396A SE504826C2 (en) 1994-10-07 1994-10-07 Treatment of chemical pulp with complexing agents in the presence of an oxidizing agent

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) NO971536D0 (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
EP0925401B1 (en) * 1996-09-11 2002-01-16 SOLVAY INTEROX (Société Anonyme) Method for bleaching paper pulp
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
DE69004492T3 (en) * 1989-06-06 2001-11-15 Eka Nobel Ab, Bohus Process for bleaching pulps containing lignocellulose.

Also Published As

Publication number Publication date
JPH10506965A (en) 1998-07-07
NO971536L (en) 1997-04-04
EP0784720A1 (en) 1997-07-23
SE9403396D0 (en) 1994-10-07
AU3712495A (en) 1996-05-02
CA2199257A1 (en) 1996-04-18
NO971536D0 (en) 1997-04-04
FI971401A7 (en) 1997-04-04
CN1159842A (en) 1997-09-17
AU686024B2 (en) 1998-01-29
FI971401A0 (en) 1997-04-04
SE504826C2 (en) 1997-05-12
FI971401L (en) 1997-04-04
WO1996011298A1 (en) 1996-04-18
BR9509253A (en) 1997-10-21

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