ES2153593T3 - TREATMENT OF A PAPER PASTE WITH A CHELATING AGENT IN AT LEAST TWO STAGES OF MIXING WITHOUT INTERMEDIATE WASHING. - Google Patents

TREATMENT OF A PAPER PASTE WITH A CHELATING AGENT IN AT LEAST TWO STAGES OF MIXING WITHOUT INTERMEDIATE WASHING.

Info

Publication number
ES2153593T3
ES2153593T3 ES96928765T ES96928765T ES2153593T3 ES 2153593 T3 ES2153593 T3 ES 2153593T3 ES 96928765 T ES96928765 T ES 96928765T ES 96928765 T ES96928765 T ES 96928765T ES 2153593 T3 ES2153593 T3 ES 2153593T3
Authority
ES
Spain
Prior art keywords
chelating agent
mixing
stages
treatment
intermediate washing
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
ES96928765T
Other languages
Spanish (es)
Inventor
Ulf Germgard
Jonas Lindquist
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet AB
Original Assignee
Valmet Fibertech 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=ES2153593(T3) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Valmet Fibertech AB filed Critical Valmet Fibertech AB
Application granted granted Critical
Publication of ES2153593T3 publication Critical patent/ES2153593T3/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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.
ES96928765T 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. Expired - Lifetime ES2153593T3 (en)

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 (1)

Publication Number Publication Date
ES2153593T3 true ES2153593T3 (en) 2001-03-01

Family

ID=20399294

Family Applications (1)

Application Number Title Priority Date Filing Date
ES96928765T Expired - Lifetime 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.

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
CN103088699B (en) 2008-06-20 2015-04-22 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
ATE97179T1 (en) * 1989-06-06 1993-11-15 Eka Nobel Ab PROCESS FOR BLEACHING LIGNOCELLULOSE CONTAINING PULP.
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
DE69611680D1 (en) 2001-03-01
SE504803C2 (en) 1997-04-28
EP0846199B1 (en) 2001-01-24
EP0846199A1 (en) 1998-06-10
PT846199E (en) 2001-06-29
WO1997008380A1 (en) 1997-03-06
NO980753D0 (en) 1998-02-23
SE9502962D0 (en) 1995-08-24
ATE198916T1 (en) 2001-02-15
SE9502962L (en) 1997-02-25
NO980753L (en) 1998-02-24
CA2229212A1 (en) 1997-03-06
AU6839996A (en) 1997-03-19
DE69611680T2 (en) 2001-05-10
BR9610199A (en) 1998-08-04

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