NO993290L - Treatment of wood pulp with a chelator without using a bleaching tool - Google Patents

Treatment of wood pulp with a chelator without using a bleaching tool

Info

Publication number
NO993290L
NO993290L NO993290A NO993290A NO993290L NO 993290 L NO993290 L NO 993290L NO 993290 A NO993290 A NO 993290A NO 993290 A NO993290 A NO 993290A NO 993290 L NO993290 L NO 993290L
Authority
NO
Norway
Prior art keywords
pulp
bleaching
chelator
tool
treatment
Prior art date
Application number
NO993290A
Other languages
Norwegian (no)
Other versions
NO993290D0 (en
Inventor
Ulf Germgord
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 NO993290D0 publication Critical patent/NO993290D0/en
Publication of NO993290L publication Critical patent/NO993290L/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
    • D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating 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
    • D21C9/1026—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)
  • Detergent Compositions (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Hybrid Cells (AREA)
  • Noodles (AREA)

Abstract

A method at chlorine-free bleaching of pulp where metals are removed by means of chelating agent. The chelating agent is mixed with the pulp in at least one effective mixing step without intermediate washing, whereafter the pulp without an intermediate tower passes directly to a pulp washer. The total retention time shall be at maximum 15 minutes, calculated after the chelating agent addition.
NO993290A 1997-01-03 1999-07-02 Treatment of wood pulp with a chelator without using a bleaching tool NO993290L (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9700030A SE508239C2 (en) 1997-01-03 1997-01-03 Treatment of pulp with complexing agents in at least one mixing step, without the use of the bleaching tower
PCT/SE1997/001853 WO1998029597A1 (en) 1997-01-03 1997-11-06 Treatment of pulp with a chelating agent without using a bleaching tower

Publications (2)

Publication Number Publication Date
NO993290D0 NO993290D0 (en) 1999-07-02
NO993290L true NO993290L (en) 1999-09-02

Family

ID=20405369

Family Applications (1)

Application Number Title Priority Date Filing Date
NO993290A NO993290L (en) 1997-01-03 1999-07-02 Treatment of wood pulp with a chelator without using a bleaching tool

Country Status (16)

Country Link
EP (1) EP0951599B1 (en)
JP (1) JP2001508837A (en)
CN (1) CN1103832C (en)
AT (1) ATE241725T1 (en)
AU (1) AU726599B2 (en)
BR (1) BR9714252A (en)
CA (1) CA2275257A1 (en)
DE (1) DE69722445T2 (en)
ES (1) ES2195123T3 (en)
ID (1) ID20003A (en)
NO (1) NO993290L (en)
NZ (1) NZ336204A (en)
PT (1) PT951599E (en)
SE (1) SE508239C2 (en)
WO (1) WO1998029597A1 (en)
ZA (1) ZA9710418B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101446054B (en) * 2008-12-23 2010-04-14 华南理工大学 Total-chlorine-free bleaching method of paper pulp production line with annual output of more than 50,000 tons

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
SE504803C2 (en) * 1995-08-24 1997-04-28 Sunds Defibrator Ind Ab Treatment of pulp with complexing agents in at least two mixing steps without intermediate washing

Also Published As

Publication number Publication date
DE69722445T2 (en) 2004-01-15
AU726599B2 (en) 2000-11-16
ATE241725T1 (en) 2003-06-15
SE9700030D0 (en) 1997-01-03
BR9714252A (en) 2000-04-18
CN1103832C (en) 2003-03-26
EP0951599B1 (en) 2003-05-28
NZ336204A (en) 1999-11-29
NO993290D0 (en) 1999-07-02
SE508239C2 (en) 1998-09-21
SE9700030L (en) 1998-07-04
ZA9710418B (en) 1998-06-10
WO1998029597A1 (en) 1998-07-09
CA2275257A1 (en) 1998-07-09
DE69722445D1 (en) 2003-07-03
ES2195123T3 (en) 2003-12-01
ID20003A (en) 1998-09-10
PT951599E (en) 2003-10-31
JP2001508837A (en) 2001-07-03
AU4974197A (en) 1998-07-31
CN1242060A (en) 2000-01-19
EP0951599A1 (en) 1999-10-27

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