SE9900178D0 - Removal of transition metal ions from wood pulp fibers - Google Patents

Removal of transition metal ions from wood pulp fibers

Info

Publication number
SE9900178D0
SE9900178D0 SE9900178A SE9900178A SE9900178D0 SE 9900178 D0 SE9900178 D0 SE 9900178D0 SE 9900178 A SE9900178 A SE 9900178A SE 9900178 A SE9900178 A SE 9900178A SE 9900178 D0 SE9900178 D0 SE 9900178D0
Authority
SE
Sweden
Prior art keywords
pulp
metal ions
removal
manganese
dtpa
Prior art date
Application number
SE9900178A
Other languages
Swedish (sv)
Other versions
SE9900178L (en
Inventor
Y Ni
Z Li
A R P Van Heiningen
Original Assignee
Ahlstrom Machinery Inc
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 Ahlstrom Machinery Inc filed Critical Ahlstrom Machinery Inc
Publication of SE9900178D0 publication Critical patent/SE9900178D0/en
Publication of SE9900178L publication Critical patent/SE9900178L/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)

Abstract

A process for the removal of transition metal ions from wood fiber slurries (cellulose pulp, including mechanical and chemical pulps), such as manganese, applies a pulse of solution containing beneficial metal ions, such as magnesium, chelant, or ion exchange chemical (or acid at a pH between about 1-4) through a pulp mat or pad. This leads to an efficient removal of manganese and a good retention of magnesium in pulp fibers at a magnesium sulfate charge as low as about 1 % (on pulp). Results from subsequent peroxide bleaching show that the MgSO4 eluted pulp has a similar bleaching performance as that of the conventional DTPA chelated pulp. More efficient removal of manganese from pulp fibers can be achieved when DTPA chelation is performed by applying a pulse of DTPA solution through a pulp pad or mat compared to that of a conventional chelation stage.
SE9900178A 1998-02-19 1999-01-21 Removal of transition metal ions from wood pulp fibers SE9900178L (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US2586598A 1998-02-19 1998-02-19

Publications (2)

Publication Number Publication Date
SE9900178D0 true SE9900178D0 (en) 1999-01-21
SE9900178L SE9900178L (en) 1999-08-20

Family

ID=21828470

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9900178A SE9900178L (en) 1998-02-19 1999-01-21 Removal of transition metal ions from wood pulp fibers

Country Status (4)

Country Link
JP (1) JPH11279966A (en)
CA (1) CA2258387A1 (en)
FI (1) FI990278A (en)
SE (1) SE9900178L (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4973284B2 (en) * 2007-03-30 2012-07-11 栗田工業株式会社 Pulp cleaning agent, pulp manufacturing method, and pulp cleaning method

Also Published As

Publication number Publication date
JPH11279966A (en) 1999-10-12
FI990278A0 (en) 1999-02-12
CA2258387A1 (en) 1999-08-19
FI990278A (en) 1999-08-20
SE9900178L (en) 1999-08-20

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Legal Events

Date Code Title Description
NAV Patent application has lapsed