ATE39714T1 - MULTI-STAGE PEROXIDE BLEACHING OF A MECHANICAL PULP. - Google Patents

MULTI-STAGE PEROXIDE BLEACHING OF A MECHANICAL PULP.

Info

Publication number
ATE39714T1
ATE39714T1 AT86890030T AT86890030T ATE39714T1 AT E39714 T1 ATE39714 T1 AT E39714T1 AT 86890030 T AT86890030 T AT 86890030T AT 86890030 T AT86890030 T AT 86890030T AT E39714 T1 ATE39714 T1 AT E39714T1
Authority
AT
Austria
Prior art keywords
pulp
stage
bleaching
stages
mechanical pulp
Prior art date
Application number
AT86890030T
Other languages
German (de)
Inventor
Petter Tibbling
Original Assignee
Kamyr 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 Kamyr Ab filed Critical Kamyr Ab
Application granted granted Critical
Publication of ATE39714T1 publication Critical patent/ATE39714T1/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
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1057—Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Joints Allowing Movement (AREA)
  • Springs (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Liquid Crystal Substances (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Electron Beam Exposure (AREA)

Abstract

Bleaching of a mechanical pulp, such as chemimechanical pulp (CMP), chemithermomechanical pulp (CTMP), and the like, achieves high brightness. A lignocellulose mechanical pulp is subjected to two different peroxide (P) stages (12, 18), and a hydrosulfite (dithionite) (T) stage (20). A P-P-T sequence is preferred (although a P-T-P sequence also produces good results). Bleaching is typically accomplished in all stages at a consistency of between about 8-30%. Between the peroxide stages, the pulp is preferably pressed (19). Between a peroxide stage and a subsequent hydrosulfite stage the pulp is preferably pressed (19 min ), and the pH reduced to between about 5.5-6.0 when diluting with SO2 water (26). The P-P-T bleaching sequence results in pulp with unexpectedly high brightness, brightness levels of about 83% ISO, and greater, being possible.
AT86890030T 1985-02-15 1986-02-12 MULTI-STAGE PEROXIDE BLEACHING OF A MECHANICAL PULP. ATE39714T1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US70200085A 1985-02-15 1985-02-15
EP86890030A EP0191756B1 (en) 1985-02-15 1986-02-12 Multi peroxide stage mechanical pulp bleaching

Publications (1)

Publication Number Publication Date
ATE39714T1 true ATE39714T1 (en) 1989-01-15

Family

ID=24819495

Family Applications (1)

Application Number Title Priority Date Filing Date
AT86890030T ATE39714T1 (en) 1985-02-15 1986-02-12 MULTI-STAGE PEROXIDE BLEACHING OF A MECHANICAL PULP.

Country Status (8)

Country Link
EP (1) EP0191756B1 (en)
JP (1) JPS61245392A (en)
AT (1) ATE39714T1 (en)
BR (1) BR8600637A (en)
DE (1) DE3661641D1 (en)
FI (1) FI85729C (en)
NO (1) NO166244C (en)
SE (1) SE8600615L (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE455203B (en) * 1986-10-20 1988-06-27 Eka Nobel Ab PROCEDURE FOR THE CONTROL OF PEROXID WHEATING OF MASS
FR2622221A1 (en) * 1987-10-22 1989-04-28 Atochem PROCESS FOR BLEACHING PASTA
FR2639371B1 (en) * 1988-11-24 1995-04-14 Atochem PROCESS FOR THE BLEACHING OF DEINKED PASTA
CA1340348C (en) * 1989-03-23 1999-01-26 Michel Barbe Bleaching process for the production of high bright pulps
JPH076148B2 (en) * 1989-06-27 1995-01-30 新王子製紙株式会社 Bleaching method for lignocellulosic material
BE1004630A3 (en) * 1990-10-17 1992-12-22 Interox Internat Sa Method for preservation of strength characteristics of paper pulp chemicals.
GB9212926D0 (en) * 1992-06-18 1992-07-29 Morton Int Inc Method of bleaching paper pulp
US5464501A (en) * 1993-04-06 1995-11-07 Societe Anonyme Pour L'etude Et L'exploitation L'air Liquide, Des Procedes Georges Claude Bleaching recycled pulp with a reductive-oxidative sequence
IT1296947B1 (en) * 1997-12-10 1999-08-03 Donato Fausto De COMPOSITION FOR WHITENING THE WOOD PASTE AND RELATED PROCEDURE
EP1418269B1 (en) 2002-11-05 2009-02-11 Rohm And Haas Company Method for brightening virgin mechanical pulp

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1820502A (en) * 1928-06-30 1931-08-25 Champion Fibre Company Bleaching cellulose pulp
US2290601A (en) * 1940-02-16 1942-07-21 Du Pont Bleaching of ground wood pulp with preliminary bisulphite treatment
US2862784A (en) * 1955-03-04 1958-12-02 Virginia Smelting Company Oxidative-reductive multi-stage bleaching of ground wood pulp
JPS5679798A (en) * 1979-12-03 1981-06-30 Mitsubishi Gas Chemical Co Production of bleaching machine pulp
JPS575992A (en) * 1980-06-04 1982-01-12 Mitsubishi Gas Chemical Co Bleaching of high yield pulp by peroxide
CA1249402A (en) * 1984-12-21 1989-01-31 Pulp And Paper Research Institute Of Canada Multistage brightening of high yield and ultra high- yield wood pulps

Also Published As

Publication number Publication date
EP0191756A1 (en) 1986-08-20
FI85729B (en) 1992-02-14
FI85729C (en) 1992-05-25
BR8600637A (en) 1986-11-04
JPS61245392A (en) 1986-10-31
NO860546L (en) 1986-08-18
FI860688A (en) 1986-08-16
SE8600615D0 (en) 1986-02-12
FI860688A0 (en) 1986-02-14
SE8600615L (en) 1986-08-16
NO166244C (en) 1991-06-19
DE3661641D1 (en) 1989-02-09
EP0191756B1 (en) 1989-01-04
NO166244B (en) 1991-03-11

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Legal Events

Date Code Title Description
UEP Publication of translation of european patent specification
REN Ceased due to non-payment of the annual fee