ATE106961T1 - BLEACHING PROCESS FOR THE PRODUCTION OF HIGH WHITE PULP. - Google Patents

BLEACHING PROCESS FOR THE PRODUCTION OF HIGH WHITE PULP.

Info

Publication number
ATE106961T1
ATE106961T1 AT90905400T AT90905400T ATE106961T1 AT E106961 T1 ATE106961 T1 AT E106961T1 AT 90905400 T AT90905400 T AT 90905400T AT 90905400 T AT90905400 T AT 90905400T AT E106961 T1 ATE106961 T1 AT E106961T1
Authority
AT
Austria
Prior art keywords
production
bleaching process
high white
white pulp
stage
Prior art date
Application number
AT90905400T
Other languages
German (de)
Inventor
Michel Barbe
Carole Gagne
Celine Leduc
Claude Daneault
Original Assignee
Kvaerner Hymac 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 Kvaerner Hymac Inc filed Critical Kvaerner Hymac Inc
Application granted granted Critical
Publication of ATE106961T1 publication Critical patent/ATE106961T1/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

Abstract

A process for the bleaching of mechanical and chemimechanical pulps which includes the steps of treating in a first stage the pulp with a reducing agent and subsequently treating the same pulp with a peroxygen compound in a second stage followed by a subsequent treatment with a peroxygen compound in a third stage.
AT90905400T 1989-03-23 1990-03-22 BLEACHING PROCESS FOR THE PRODUCTION OF HIGH WHITE PULP. ATE106961T1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA000594763A CA1340348C (en) 1989-03-23 1989-03-23 Bleaching process for the production of high bright pulps

Publications (1)

Publication Number Publication Date
ATE106961T1 true ATE106961T1 (en) 1994-06-15

Family

ID=4139806

Family Applications (1)

Application Number Title Priority Date Filing Date
AT90905400T ATE106961T1 (en) 1989-03-23 1990-03-22 BLEACHING PROCESS FOR THE PRODUCTION OF HIGH WHITE PULP.

Country Status (5)

Country Link
EP (1) EP0464110B1 (en)
AT (1) ATE106961T1 (en)
CA (1) CA1340348C (en)
DE (1) DE69009750D1 (en)
WO (1) WO1990011403A1 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USH1690H (en) * 1995-07-20 1997-11-04 Nye; Jeffrey Process for bleaching kraft pulp
FI105932B (en) * 1996-05-30 2000-10-31 Kemira Chemicals Oy A process for bleaching high yield or recycled pulp
US20030062138A1 (en) * 2001-05-09 2003-04-03 Hache Maurice Joseph Albert Method for brightening mechanical pulps
DE60326113D1 (en) 2002-11-05 2009-03-26 Rohm & Haas Process for bleaching mechanical pulp
FI122239B (en) 2004-02-25 2011-10-31 Kemira Oyj Process for treating fibrous material and new composition
FI120201B (en) 2004-05-12 2009-07-31 Kemira Oyj A novel composition and method for treating a fibrous material
US7967948B2 (en) * 2006-06-02 2011-06-28 International Paper Company Process for non-chlorine oxidative bleaching of mechanical pulp in the presence of optical brightening agents
US20100224333A1 (en) 2009-03-09 2010-09-09 Prasad Duggirala Method and chemical composition to improve efficiency of mechanical pulp
US9932709B2 (en) 2013-03-15 2018-04-03 Ecolab Usa Inc. Processes and compositions for brightness improvement in paper production
CN104237211B (en) * 2014-09-23 2016-09-28 中国科学院长春应用化学研究所 A kind of luminol chemiluminescence system and luminol, thiourea dioxide, the assay method of concentration of cobalt ions

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
EP0191756B1 (en) * 1985-02-15 1989-01-04 Kamyr Ab Multi peroxide stage mechanical pulp bleaching

Also Published As

Publication number Publication date
CA1340348C (en) 1999-01-26
WO1990011403A1 (en) 1990-10-04
EP0464110A1 (en) 1992-01-08
DE69009750D1 (en) 1994-07-14
EP0464110B1 (en) 1994-06-08

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Legal Events

Date Code Title Description
RER Ceased as to paragraph 5 lit. 3 law introducing patent treaties