NO980753L - Treatment of pulp with chelating agent in at least two steps without intermediate washing - Google Patents

Treatment of pulp with chelating agent in at least two steps without intermediate washing

Info

Publication number
NO980753L
NO980753L NO980753A NO980753A NO980753L NO 980753 L NO980753 L NO 980753L NO 980753 A NO980753 A NO 980753A NO 980753 A NO980753 A NO 980753A NO 980753 L NO980753 L NO 980753L
Authority
NO
Norway
Prior art keywords
pulp
chelating agent
steps
treatment
intermediate washing
Prior art date
Application number
NO980753A
Other languages
Norwegian (no)
Other versions
NO980753D0 (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=NO980753(L) "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
Publication of NO980753D0 publication Critical patent/NO980753D0/en
Publication of NO980753L publication Critical 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)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Cosmetics (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.
NO980753A 1995-08-24 1998-02-23 Treatment of pulp with chelating agent in at least two steps without intermediate washing NO980753L (en)

Applications Claiming Priority (2)

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
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

Publications (2)

Publication Number Publication Date
NO980753D0 NO980753D0 (en) 1998-02-23
NO980753L true NO980753L (en) 1998-02-24

Family

ID=20399294

Family Applications (1)

Application Number Title Priority Date Filing Date
NO980753A NO980753L (en) 1995-08-24 1998-02-23 Treatment of pulp with chelating agent in at least two 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, Bohus Process for bleaching pulps containing lignocellulose.
SE9201477L (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
ES2153593T3 (en) 2001-03-01
PT846199E (en) 2001-06-29
EP0846199B1 (en) 2001-01-24
SE504803C2 (en) 1997-04-28
EP0846199A1 (en) 1998-06-10
DE69611680T2 (en) 2001-05-10
DE69611680D1 (en) 2001-03-01
AU6839996A (en) 1997-03-19
NO980753D0 (en) 1998-02-23
SE9502962L (en) 1997-02-25
ATE198916T1 (en) 2001-02-15
BR9610199A (en) 1998-08-04
CA2229212A1 (en) 1997-03-06
WO1997008380A1 (en) 1997-03-06
SE9502962D0 (en) 1995-08-24

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Legal Events

Date Code Title Description
FC2A Withdrawal, rejection or dismissal of laid open patent application