ATE184060T1 - METHOD FOR BLEACHING PULP CONTAINING LIGNOCELLULOSE - Google Patents

METHOD FOR BLEACHING PULP CONTAINING LIGNOCELLULOSE

Info

Publication number
ATE184060T1
ATE184060T1 AT94200924T AT94200924T ATE184060T1 AT E184060 T1 ATE184060 T1 AT E184060T1 AT 94200924 T AT94200924 T AT 94200924T AT 94200924 T AT94200924 T AT 94200924T AT E184060 T1 ATE184060 T1 AT E184060T1
Authority
AT
Austria
Prior art keywords
pulp
order
compound
bleaching
pulp containing
Prior art date
Application number
AT94200924T
Other languages
German (de)
Inventor
Lillemor Holtinger
Jiri Basta
Wenche Hermansson
Original Assignee
Eka Chemicals 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26661708&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=ATE184060(T1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from SE9301294A external-priority patent/SE501581E/en
Priority claimed from SE9301293A external-priority patent/SE501651E/en
Application filed by Eka Chemicals Ab filed Critical Eka Chemicals Ab
Application granted granted Critical
Publication of ATE184060T1 publication Critical patent/ATE184060T1/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
    • D21C9/1005—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
    • D21C9/1042—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

Abstract

In a method for bleaching lignocellulose-containing pulp with a peroxide-containing compound, the pulp is, prior to the bleaching and in optional order, subjected to acid treatment at a pH of up to about 5 and treated with a complexing agent in order to release transition metal ions from their positions in the pulp. After the acid treatment, a magnesium compound and a calcium compound are added to the pulp at a pH of from about 3.5 to about 8 in order to reintroduce an optimum amount of magnesium and calcium ions into the pulp. The pulp is then bleached with a peroxide-containing compound at a pH of from about 7 to about 13.
AT94200924T 1993-04-20 1994-04-05 METHOD FOR BLEACHING PULP CONTAINING LIGNOCELLULOSE ATE184060T1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9301294A SE501581E (en) 1993-04-20 1993-04-20 Pre-treatment of lignocellulosic pulp with magnesium and calcium compound before peroxide bleaching
SE9301293A SE501651E (en) 1993-04-20 1993-04-20 Pre-treatment of lignocellulosic pulp with magnesium and calcium compound before peroxide bleaching

Publications (1)

Publication Number Publication Date
ATE184060T1 true ATE184060T1 (en) 1999-09-15

Family

ID=26661708

Family Applications (1)

Application Number Title Priority Date Filing Date
AT94200924T ATE184060T1 (en) 1993-04-20 1994-04-05 METHOD FOR BLEACHING PULP CONTAINING LIGNOCELLULOSE

Country Status (7)

Country Link
EP (1) EP0622491B2 (en)
AT (1) ATE184060T1 (en)
BR (1) BR9401526A (en)
CA (1) CA2121387C (en)
DE (1) DE69420306T2 (en)
FI (1) FI941764A (en)
NO (1) NO302767B1 (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE502706E (en) 1994-04-05 1999-06-18 Mo Och Domsjoe Ab Preparation of bleached cellulose pulp by bleaching with chlorine dioxide and treatment of complexing agents in the same step
US6776876B1 (en) 1994-10-13 2004-08-17 Andritz Oy Method of treating cellulosic pulp to remove hexenuronic acid
CA2211223C (en) * 1995-02-17 2002-04-30 Ahlstrom Machinery Oy Method of pretreating pulp to be bleached with peroxide
FI105701B (en) 1995-10-20 2000-09-29 Ahlstrom Machinery Oy Method and arrangement for treatment of pulp
US6706143B1 (en) 1996-03-19 2004-03-16 International Paper Company Minimizing chlorinated organics in pulp bleaching processes
BE1010677A3 (en) * 1996-10-11 1998-11-03 Solvay Interox Method for the delignification and bleaching of a chemical paper pulp
DE69709656T2 (en) * 1996-09-11 2002-10-17 Solvay Interox Sa METHOD FOR BLEACHING PAPER FIBER
BE1010617A3 (en) * 1996-09-11 1998-11-03 Solvay Interox Paper pulp bleaching method
BE1010678A3 (en) * 1996-10-11 1998-11-03 Solvay Interox Method for the delignification and bleaching of a chemical paper pulp
BE1010679A3 (en) * 1996-10-11 1998-11-03 Solvay Interox Delignification process and laundering pulp chemicals.
BE1011784A3 (en) * 1998-03-10 2000-01-11 Solvay Bleaching pulp process.
SE0200981D0 (en) * 2002-03-28 2002-03-28 Eka Chemicals Ab Process for bleaching lignocellulose-containing non-wood pulp
DE10320618A1 (en) * 2003-05-08 2004-11-18 Papierfabrik Albbruck Gmbh & Co. Kg Process for bleaching fibrous materials
JP4967451B2 (en) 2006-05-17 2012-07-04 三菱瓦斯化学株式会社 Method for producing bleached pulp
US20080110584A1 (en) * 2006-11-15 2008-05-15 Caifang Yin Bleaching process with at least one extraction stage

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE420430B (en) † 1978-02-17 1981-10-05 Mo Och Domsjoe Ab PROCEDURE FOR WHEATING AND EXTRACTION OF LIGNOCELLULOSALLY MATERIALS WITH PEROXID CONTAINING BLACKS
FR2557605B1 (en) * 1983-12-29 1987-12-11 Atochem PROCESS FOR BLEACHING PAPER PULP BY HYDROGEN PEROXIDE
EP0402335B2 (en) * 1989-06-06 2001-03-14 Eka Chemicals AB Process for bleaching lignocellulose-containing pulps
SE470065C (en) * 1991-04-30 1995-10-12 Eka Nobel Ab Treatment of chemical pulp with an acid and then a magnesium and calcium compound in chlorine-free bleaching
SE468355B (en) * 1991-04-30 1992-12-21 Eka Nobel Ab CHEMISTRY OF CHEMICAL MASS THROUGH TREATMENT WITH COMPLEX PICTURES AND OZONE

Also Published As

Publication number Publication date
NO302767B1 (en) 1998-04-20
FI941764A0 (en) 1994-04-15
DE69420306D1 (en) 1999-10-07
CA2121387A1 (en) 1994-10-21
CA2121387C (en) 1998-06-30
FI941764A (en) 1994-10-21
EP0622491B1 (en) 1999-09-01
EP0622491A2 (en) 1994-11-02
BR9401526A (en) 1994-11-22
DE69420306T2 (en) 2000-04-20
EP0622491B2 (en) 2002-07-17
EP0622491A3 (en) 1995-04-12
NO941421L (en) 1994-10-21
NO941421D0 (en) 1994-04-19

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Legal Events

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