BR9714252A - Chlorine-free pulp bleaching process. - Google Patents

Chlorine-free pulp bleaching process.

Info

Publication number
BR9714252A
BR9714252A BR9714252-2A BR9714252A BR9714252A BR 9714252 A BR9714252 A BR 9714252A BR 9714252 A BR9714252 A BR 9714252A BR 9714252 A BR9714252 A BR 9714252A
Authority
BR
Brazil
Prior art keywords
chlorine
pulp
chelating agent
bleaching process
pulp bleaching
Prior art date
Application number
BR9714252-2A
Other languages
Portuguese (pt)
Inventor
Jonas Lindqvist
Ulf Germgord
Original Assignee
Sunds Defribrator 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 Defribrator Ind Ab filed Critical Sunds Defribrator Ind Ab
Publication of BR9714252A publication Critical patent/BR9714252A/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.
BR9714252-2A 1997-01-03 1997-11-06 Chlorine-free pulp bleaching process. BR9714252A (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
BR9714252A true BR9714252A (en) 2000-04-18

Family

ID=20405369

Family Applications (1)

Application Number Title Priority Date Filing Date
BR9714252-2A BR9714252A (en) 1997-01-03 1997-11-06 Chlorine-free pulp bleaching process.

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
ID20003A (en) 1998-09-10
AU726599B2 (en) 2000-11-16
CN1242060A (en) 2000-01-19
NZ336204A (en) 1999-11-29
ZA9710418B (en) 1998-06-10
AU4974197A (en) 1998-07-31
CA2275257A1 (en) 1998-07-09
SE508239C2 (en) 1998-09-21
DE69722445D1 (en) 2003-07-03
ATE241725T1 (en) 2003-06-15
NO993290D0 (en) 1999-07-02
CN1103832C (en) 2003-03-26
JP2001508837A (en) 2001-07-03
SE9700030L (en) 1998-07-04
SE9700030D0 (en) 1997-01-03
PT951599E (en) 2003-10-31
EP0951599A1 (en) 1999-10-27
EP0951599B1 (en) 2003-05-28
NO993290L (en) 1999-09-02
ES2195123T3 (en) 2003-12-01
DE69722445T2 (en) 2004-01-15
WO1998029597A1 (en) 1998-07-09

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Legal Events

Date Code Title Description
TC Change of name
B06A Patent application procedure suspended [chapter 6.1 patent gazette]
B11B Dismissal acc. art. 36, par 1 of ipl - no reply within 90 days to fullfil the necessary requirements