ATE241725T1 - PULP TREATMENT WITH A COMPLEX FORMER WITHOUT USING A BLEACHING TOWER - Google Patents

PULP TREATMENT WITH A COMPLEX FORMER WITHOUT USING A BLEACHING TOWER

Info

Publication number
ATE241725T1
ATE241725T1 AT97912616T AT97912616T ATE241725T1 AT E241725 T1 ATE241725 T1 AT E241725T1 AT 97912616 T AT97912616 T AT 97912616T AT 97912616 T AT97912616 T AT 97912616T AT E241725 T1 ATE241725 T1 AT E241725T1
Authority
AT
Austria
Prior art keywords
pulp
chelating agent
bleaching tower
pulp treatment
complex former
Prior art date
Application number
AT97912616T
Other languages
German (de)
Inventor
Ulf Germgard
Jonas Lindquist
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
Application filed by Valmet Fibertech Ab filed Critical Valmet Fibertech Ab
Application granted granted Critical
Publication of ATE241725T1 publication Critical patent/ATE241725T1/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.
AT97912616T 1997-01-03 1997-11-06 PULP TREATMENT WITH A COMPLEX FORMER WITHOUT USING A BLEACHING TOWER ATE241725T1 (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 (1)

Publication Number Publication Date
ATE241725T1 true ATE241725T1 (en) 2003-06-15

Family

ID=20405369

Family Applications (1)

Application Number Title Priority Date Filing Date
AT97912616T ATE241725T1 (en) 1997-01-03 1997-11-06 PULP TREATMENT WITH A COMPLEX FORMER WITHOUT USING A BLEACHING TOWER

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 Full chlorine-free bleaching method for pulp production line with an 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
SE508239C2 (en) 1998-09-21
PT951599E (en) 2003-10-31
EP0951599B1 (en) 2003-05-28
JP2001508837A (en) 2001-07-03
NO993290D0 (en) 1999-07-02
ID20003A (en) 1998-09-10
SE9700030D0 (en) 1997-01-03
ES2195123T3 (en) 2003-12-01
DE69722445D1 (en) 2003-07-03
EP0951599A1 (en) 1999-10-27
NZ336204A (en) 1999-11-29
CN1242060A (en) 2000-01-19
NO993290L (en) 1999-09-02
CN1103832C (en) 2003-03-26
ZA9710418B (en) 1998-06-10
AU726599B2 (en) 2000-11-16
CA2275257A1 (en) 1998-07-09
WO1998029597A1 (en) 1998-07-09
AU4974197A (en) 1998-07-31
SE9700030L (en) 1998-07-04
BR9714252A (en) 2000-04-18

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