SE9603630D0 - Pulp bleaching process - Google Patents

Pulp bleaching process

Info

Publication number
SE9603630D0
SE9603630D0 SE9603630A SE9603630A SE9603630D0 SE 9603630 D0 SE9603630 D0 SE 9603630D0 SE 9603630 A SE9603630 A SE 9603630A SE 9603630 A SE9603630 A SE 9603630A SE 9603630 D0 SE9603630 D0 SE 9603630D0
Authority
SE
Sweden
Prior art keywords
pulp
peroxide
liquid phase
chelating agents
bleaching process
Prior art date
Application number
SE9603630A
Other languages
Swedish (sv)
Other versions
SE507505C2 (en
SE9603630L (en
Inventor
Ulf Germgaard
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 SE9603630A priority Critical patent/SE507505C2/en
Publication of SE9603630D0 publication Critical patent/SE9603630D0/en
Priority to AU45793/97A priority patent/AU4579397A/en
Priority to PCT/SE1997/001642 priority patent/WO1998014657A1/en
Publication of SE9603630L publication Critical patent/SE9603630L/en
Publication of SE507505C2 publication Critical patent/SE507505C2/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
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/0021—Introduction of various effluents, e.g. waste waters, into the pulping, recovery and regeneration cycle (closed-cycle)
    • D21C11/0028—Effluents derived from the washing or bleaching plants
    • 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
    • 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
    • D21C9/16—Bleaching ; Apparatus therefor with per compounds
    • D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

A method for pulp delignification/bleaching with peroxide comprising a treatment step with chelating agents in order to free the pulp from disturbing metal ions. Disturbing metal ions are deactivated by separating a liquid phase from the pulp after the treatment with chelating agents and the separated liquid phase containing chelating agents is treated with oxidizing agents such as ozone or peroxide. The liquid phase treated accordingly, preferably with peroxide, is returned to the pulp which in a subsequent step is subjected to a bleaching step with peroxide.
SE9603630A 1996-10-04 1996-10-04 Bleaching of paper pulp oxidizing a separated liquid phase to inactivate complex bonded metal ions SE507505C2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE9603630A SE507505C2 (en) 1996-10-04 1996-10-04 Bleaching of paper pulp oxidizing a separated liquid phase to inactivate complex bonded metal ions
AU45793/97A AU4579397A (en) 1996-10-04 1997-09-30 Oxidation of disturbing metal ions in bleaching processes
PCT/SE1997/001642 WO1998014657A1 (en) 1996-10-04 1997-09-30 Oxidation of disturbing metal ions in bleaching processes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9603630A SE507505C2 (en) 1996-10-04 1996-10-04 Bleaching of paper pulp oxidizing a separated liquid phase to inactivate complex bonded metal ions

Publications (3)

Publication Number Publication Date
SE9603630D0 true SE9603630D0 (en) 1996-10-04
SE9603630L SE9603630L (en) 1998-04-05
SE507505C2 SE507505C2 (en) 1998-06-15

Family

ID=20404131

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9603630A SE507505C2 (en) 1996-10-04 1996-10-04 Bleaching of paper pulp oxidizing a separated liquid phase to inactivate complex bonded metal ions

Country Status (3)

Country Link
AU (1) AU4579397A (en)
SE (1) SE507505C2 (en)
WO (1) WO1998014657A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE533165C2 (en) 2008-06-13 2010-07-13 Chemseq Internat Ab Chemical and process for the complex bonding of metal ions, which are at least divalent

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE500113C2 (en) * 1992-07-09 1994-04-18 Kamyr Ab Method of bleaching pulp for disposal of released metals
US5509999A (en) * 1993-03-24 1996-04-23 Kamyr, Inc. Treatment of bleach plant effluents
SE9500732L (en) * 1995-02-27 1996-08-28 Eka Chemicals Ab Procedure for the treatment of liquids

Also Published As

Publication number Publication date
SE507505C2 (en) 1998-06-15
SE9603630L (en) 1998-04-05
WO1998014657A1 (en) 1998-04-09
AU4579397A (en) 1998-04-24

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Legal Events

Date Code Title Description
NUG Patent has lapsed