SE9700030D0 - Pulp pretreatment - Google Patents

Pulp pretreatment

Info

Publication number
SE9700030D0
SE9700030D0 SE9700030A SE9700030A SE9700030D0 SE 9700030 D0 SE9700030 D0 SE 9700030D0 SE 9700030 A SE9700030 A SE 9700030A SE 9700030 A SE9700030 A SE 9700030A SE 9700030 D0 SE9700030 D0 SE 9700030D0
Authority
SE
Sweden
Prior art keywords
pulp
chelating agent
pulp pretreatment
chlorine
metals
Prior art date
Application number
SE9700030A
Other languages
Swedish (sv)
Other versions
SE508239C2 (en
SE9700030L (en
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
Priority to SE9700030A priority Critical patent/SE508239C2/en
Publication of SE9700030D0 publication Critical patent/SE9700030D0/en
Priority to PT97912616T priority patent/PT951599E/en
Priority to PCT/SE1997/001853 priority patent/WO1998029597A1/en
Priority to NZ336204A priority patent/NZ336204A/en
Priority to BR9714252-2A priority patent/BR9714252A/en
Priority to AU49741/97A priority patent/AU726599B2/en
Priority to AT97912616T priority patent/ATE241725T1/en
Priority to CN97181066A priority patent/CN1103832C/en
Priority to CA002275257A priority patent/CA2275257A1/en
Priority to ES97912616T priority patent/ES2195123T3/en
Priority to DE69722445T priority patent/DE69722445T2/en
Priority to EP97912616A priority patent/EP0951599B1/en
Priority to JP52990798A priority patent/JP2001508837A/en
Priority to ZA9710418A priority patent/ZA9710418B/en
Priority to IDP973960A priority patent/ID20003A/en
Publication of SE9700030L publication Critical patent/SE9700030L/en
Publication of SE508239C2 publication Critical patent/SE508239C2/en
Priority to NO993290A priority 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.
SE9700030A 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 SE508239C2 (en)

Priority Applications (16)

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
JP52990798A JP2001508837A (en) 1997-01-03 1997-11-06 Processing of pulp with chelating agents without using bleach towers
CA002275257A CA2275257A1 (en) 1997-01-03 1997-11-06 Treatment of pulp with a chelating agent without using a bleaching tower
DE69722445T DE69722445T2 (en) 1997-01-03 1997-11-06 TREATMENT OF CELL WITH A COMPLEX IMAGE WITHOUT THE USE OF A LIGHT TOWER
NZ336204A NZ336204A (en) 1997-01-03 1997-11-06 Treatment of pulp with a chelating agent without using a bleaching tower
BR9714252-2A BR9714252A (en) 1997-01-03 1997-11-06 Chlorine-free pulp bleaching process.
AU49741/97A AU726599B2 (en) 1997-01-03 1997-11-06 Treatment of pulp with a chelating agent without using a bleaching tower
AT97912616T ATE241725T1 (en) 1997-01-03 1997-11-06 PULP TREATMENT WITH A COMPLEX FORMER WITHOUT USING A BLEACHING TOWER
CN97181066A CN1103832C (en) 1997-01-03 1997-11-06 Treatment of pulp with a chelating agent without using a bleaching tower
PT97912616T PT951599E (en) 1997-01-03 1997-11-06 TREATMENT OF PAPER PASTE WITH A CHELATING AGENT WITHOUT USING A BLEACHING TOWER
ES97912616T ES2195123T3 (en) 1997-01-03 1997-11-06 PAPER PASTA TREATMENT WITH A CHELATING AGENT WITHOUT USING WHITENING TOWER.
PCT/SE1997/001853 WO1998029597A1 (en) 1997-01-03 1997-11-06 Treatment of pulp with a chelating agent without using a bleaching tower
EP97912616A EP0951599B1 (en) 1997-01-03 1997-11-06 Treatment of pulp with a chelating agent without using a bleaching tower
ZA9710418A ZA9710418B (en) 1997-01-03 1997-11-19 Pretreatment of pulp.
IDP973960A ID20003A (en) 1997-01-03 1997-12-23 BEGIN-WOOD PROCESSING
NO993290A NO993290L (en) 1997-01-03 1999-07-02 Treatment of wood pulp with a chelator without using a bleaching tool

Applications Claiming Priority (1)

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

Publications (3)

Publication Number Publication Date
SE9700030D0 true SE9700030D0 (en) 1997-01-03
SE9700030L SE9700030L (en) 1998-07-04
SE508239C2 SE508239C2 (en) 1998-09-21

Family

ID=20405369

Family Applications (1)

Application Number Title Priority Date Filing Date
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

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
NO993290L (en) 1999-09-02
ATE241725T1 (en) 2003-06-15
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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Legal Events

Date Code Title Description
NUG Patent has lapsed