SE9502962D0 - Bleaching of pulp - Google Patents

Bleaching of pulp

Info

Publication number
SE9502962D0
SE9502962D0 SE9502962A SE9502962A SE9502962D0 SE 9502962 D0 SE9502962 D0 SE 9502962D0 SE 9502962 A SE9502962 A SE 9502962A SE 9502962 A SE9502962 A SE 9502962A SE 9502962 D0 SE9502962 D0 SE 9502962D0
Authority
SE
Sweden
Prior art keywords
pulp
bleaching
chelating agent
mixing steps
admixed
Prior art date
Application number
SE9502962A
Other languages
Swedish (sv)
Other versions
SE504803C2 (en
SE9502962L (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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=20399294&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=SE9502962(D0) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Sunds Defibrator Ind Ab filed Critical Sunds Defibrator Ind Ab
Priority to SE9502962A priority Critical patent/SE504803C2/en
Publication of SE9502962D0 publication Critical patent/SE9502962D0/en
Priority to CA002229212A priority patent/CA2229212A1/en
Priority to PT96928765T priority patent/PT846199E/en
Priority to DE69611680T priority patent/DE69611680T2/en
Priority to AT96928765T priority patent/ATE198916T1/en
Priority to ES96928765T priority patent/ES2153593T3/en
Priority to AU68399/96A priority patent/AU6839996A/en
Priority to PCT/SE1996/000996 priority patent/WO1997008380A1/en
Priority to BR9610199A priority patent/BR9610199A/en
Priority to EP96928765A priority patent/EP0846199B1/en
Publication of SE9502962L publication Critical patent/SE9502962L/en
Publication of SE504803C2 publication Critical patent/SE504803C2/en
Priority to NO980753A priority patent/NO980753L/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

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Cosmetics (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Detergent Compositions (AREA)

Abstract

A method of chlorine-free bleaching of pulp where metals are removed by means of a chelating agent. The chelating agent is admixed to the pulp in at least two subsequent mixing steps without intermediate washing. The stay-time between the mixing steps shall be less than 15 minutes, and the pulp is washed after the last mixing step.
SE9502962A 1995-08-24 1995-08-24 Treatment of pulp with complexing agents in at least two mixing steps without intermediate washing SE504803C2 (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
SE9502962A SE504803C2 (en) 1995-08-24 1995-08-24 Treatment of pulp with complexing agents in at least two mixing steps without intermediate washing
EP96928765A EP0846199B1 (en) 1995-08-24 1996-08-09 Treatment of pulp with chelating agent in at least two mixing steps without intermediate washing
BR9610199A BR9610199A (en) 1995-08-24 1996-08-09 Chlorine-free pulp bleaching process
CA002229212A CA2229212A1 (en) 1995-08-24 1996-08-09 Treatment of pulp with chelating agent in at least two mixing steps without intermediate washing
PT96928765T PT846199E (en) 1995-08-24 1996-08-09 TREATMENT OF PASTE WITH CHELATING AGENT AT LEAST TWO STEPS OF MIXTURE WITHOUT INTERMEDIATE WASHING
DE69611680T DE69611680T2 (en) 1995-08-24 1996-08-09 Cellulose treatment with a complexing agent in at least two mixing stages without intermediate washing
AT96928765T ATE198916T1 (en) 1995-08-24 1996-08-09 PULP TREATMENT WITH A COMPLEX FORMING AGENT IN AT LEAST TWO MIXING STAGES WITHOUT INTERMEDIATE WASHING
ES96928765T ES2153593T3 (en) 1995-08-24 1996-08-09 TREATMENT OF A PAPER PASTE WITH A CHELATING AGENT IN AT LEAST TWO STAGES OF MIXING WITHOUT INTERMEDIATE WASHING.
AU68399/96A AU6839996A (en) 1995-08-24 1996-08-09 Treatment of pulp with chelating agent in at least two mixing steps without intermediate washing
PCT/SE1996/000996 WO1997008380A1 (en) 1995-08-24 1996-08-09 Treatment of pulp with chelating agent in at least two mixing steps without intermediate washing
NO980753A NO980753L (en) 1995-08-24 1998-02-23 Treatment of pulp with chelating agent in at least two steps without intermediate washing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9502962A SE504803C2 (en) 1995-08-24 1995-08-24 Treatment of pulp with complexing agents in at least two mixing steps without intermediate washing

Publications (3)

Publication Number Publication Date
SE9502962D0 true SE9502962D0 (en) 1995-08-24
SE9502962L SE9502962L (en) 1997-02-25
SE504803C2 SE504803C2 (en) 1997-04-28

Family

ID=20399294

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9502962A SE504803C2 (en) 1995-08-24 1995-08-24 Treatment of pulp with complexing agents in at least two mixing steps without intermediate washing

Country Status (11)

Country Link
EP (1) EP0846199B1 (en)
AT (1) ATE198916T1 (en)
AU (1) AU6839996A (en)
BR (1) BR9610199A (en)
CA (1) CA2229212A1 (en)
DE (1) DE69611680T2 (en)
ES (1) ES2153593T3 (en)
NO (1) NO980753L (en)
PT (1) PT846199E (en)
SE (1) SE504803C2 (en)
WO (1) WO1997008380A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE508239C2 (en) * 1997-01-03 1998-09-21 Sunds Defibrator Ind Ab Treatment of pulp with complexing agents in at least one mixing step, without the use of the bleaching tower
CN102076911B (en) 2008-06-20 2013-03-13 国际纸业公司 Composition and recording sheet with improved optical properties

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69004492T3 (en) * 1989-06-06 2001-11-15 Eka Nobel Ab Process for bleaching pulps containing lignocellulose.
SE469387B (en) * 1992-05-11 1993-06-28 Kamyr Ab SEATING WHITE PILLOW WITHOUT USING CHLORIC CHEMICALS
SE502665C2 (en) * 1993-06-11 1995-12-04 Kvaerner Pulping Tech Methods and reactor for ozone bleaching
SE501836C2 (en) * 1993-09-21 1995-05-22 Sunds Defibrator Ind Ab Bleaching of chemical pulp whereby the pulp is treated with complexing agents before and after an ozone step

Also Published As

Publication number Publication date
SE504803C2 (en) 1997-04-28
ATE198916T1 (en) 2001-02-15
EP0846199A1 (en) 1998-06-10
NO980753D0 (en) 1998-02-23
WO1997008380A1 (en) 1997-03-06
NO980753L (en) 1998-02-24
BR9610199A (en) 1998-08-04
SE9502962L (en) 1997-02-25
ES2153593T3 (en) 2001-03-01
DE69611680D1 (en) 2001-03-01
PT846199E (en) 2001-06-29
AU6839996A (en) 1997-03-19
EP0846199B1 (en) 2001-01-24
CA2229212A1 (en) 1997-03-06
DE69611680T2 (en) 2001-05-10

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Legal Events

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