CA2219767A1 - Treatment of pulp with chelating agent and subsequent bleaching at a ph value above 9 - Google Patents

Treatment of pulp with chelating agent and subsequent bleaching at a ph value above 9 Download PDF

Info

Publication number
CA2219767A1
CA2219767A1 CA002219767A CA2219767A CA2219767A1 CA 2219767 A1 CA2219767 A1 CA 2219767A1 CA 002219767 A CA002219767 A CA 002219767A CA 2219767 A CA2219767 A CA 2219767A CA 2219767 A1 CA2219767 A1 CA 2219767A1
Authority
CA
Canada
Prior art keywords
pulp
chelating agent
bleaching
hydrogen peroxide
treatment
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
CA002219767A
Other languages
English (en)
French (fr)
Inventor
Ulf Germgard
Rolf Boman
Jonas Lindquist
Kenneth Hafvenstrom
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet AB
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2219767A1 publication Critical patent/CA2219767A1/en
Abandoned legal-status Critical Current

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
    • D21C9/10—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
    • D21C9/1005—Pretreatment of the pulp, e.g. degassing the pulp
    • 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
    • D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
CA002219767A 1995-05-02 1996-03-27 Treatment of pulp with chelating agent and subsequent bleaching at a ph value above 9 Abandoned CA2219767A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9501623-4 1995-05-02
SE9501623A SE9501623L (sv) 1995-05-02 1995-05-02 Blekning av massa

Publications (1)

Publication Number Publication Date
CA2219767A1 true CA2219767A1 (en) 1996-11-07

Family

ID=20398166

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002219767A Abandoned CA2219767A1 (en) 1995-05-02 1996-03-27 Treatment of pulp with chelating agent and subsequent bleaching at a ph value above 9

Country Status (6)

Country Link
JP (1) JPH11504399A (ja)
CA (1) CA2219767A1 (ja)
FI (1) FI974115A0 (ja)
NO (1) NO975038D0 (ja)
SE (1) SE9501623L (ja)
WO (1) WO1996035015A1 (ja)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE509444C2 (sv) * 1997-05-14 1999-01-25 Mo Och Domsjoe Ab Förfarande för minimering av kalcium orsakat inkrustproblem vid framställning av blekt cellulosamassa
CA2310278A1 (en) * 1997-11-25 1999-06-03 Amylum Belgium N.V. Improvements to the bleaching process for chemical pulp and intermediate pulp dispersions
BE1011785A3 (fr) * 1998-03-10 2000-01-11 Solvay Procede de blanchiment et/ou de delignification de pates a papier chimiques.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2096441T3 (es) * 1992-11-27 1997-03-01 Eka Chemicals Ab Procedimiento para deslignificar pasta que contiene lignocelulosa.
US5554259A (en) * 1993-10-01 1996-09-10 Union Camp Patent Holdings, Inc. Reduction of salt scale precipitation by control of process stream Ph and salt concentration

Also Published As

Publication number Publication date
NO975038L (no) 1997-10-31
WO1996035015A1 (en) 1996-11-07
FI974115A (fi) 1997-11-03
SE9501623D0 (sv) 1995-05-02
JPH11504399A (ja) 1999-04-20
NO975038D0 (no) 1997-10-31
FI974115A0 (fi) 1997-11-03
SE9501623L (sv) 1996-11-03

Similar Documents

Publication Publication Date Title
US5785812A (en) Process for treating oxygen delignified pulp using an organic peracid or salt, complexing agent and peroxide bleach sequence
US4661205A (en) Method of bleaching lignocellulosic material with peroxide catalyzed with a salt of a metal
US5658429A (en) Process for bleaching of lignocellulose-containing pulp using a chelating agent prior to a peroxide-ozone-peroxide sequence
CA2115881C (en) Non-chlorine bleaching of kraft pulp
WO1979000637A1 (en) Bleaching lignocellulose material with bleaching agents containing peroxide
US6007678A (en) Process for delignification of lignocellulose-containing pulp with an organic peracid or salts thereof
CA2121387C (en) Method for bleaching lignocellulose-containing pulp
US6123809A (en) Method for bleaching paper pulp
EP0789798B1 (en) Process for delignification and bleaching of chemical wood pulps
WO1996009434A1 (en) Method of bleaching kraft pulp
EP0464110B1 (en) Bleaching process for the production of high bright pulps
AU665461B2 (en) Method of treating process water
CA2219767A1 (en) Treatment of pulp with chelating agent and subsequent bleaching at a ph value above 9
CA2647781C (en) Bleaching process of chemical pulp
EP0670929B2 (en) Process for bleaching of lignocellulose-containing pulp
CA2163116C (en) Method of bleaching pulp without using chlorine chemicals
WO1997008381A1 (en) Method for preventing accumulation of metals in a closed pulp bleaching process
AU686024B2 (en) Treatment of chemical pulp with a chelating agent and an oxidizing agent in connection with bleaching
WO1998014657A1 (en) Oxidation of disturbing metal ions in bleaching processes
WO1998021400A1 (en) Prebleaching of paperpulp before a peroxide bleaching stage
EP0951599B1 (en) Treatment of pulp with a chelating agent without using a bleaching tower
RU2097462C1 (ru) Способ делигнификации и отбеливания лигноцеллюлозосодержащей пульпы
CA2173735A1 (en) A method of separating metal ions from pulp

Legal Events

Date Code Title Description
FZDE Discontinued