CA2121387A1 - Method for Bleaching Lignocellulose-Containing Pulp - Google Patents

Method for Bleaching Lignocellulose-Containing Pulp

Info

Publication number
CA2121387A1
CA2121387A1 CA2121387A CA2121387A CA2121387A1 CA 2121387 A1 CA2121387 A1 CA 2121387A1 CA 2121387 A CA2121387 A CA 2121387A CA 2121387 A CA2121387 A CA 2121387A CA 2121387 A1 CA2121387 A1 CA 2121387A1
Authority
CA
Canada
Prior art keywords
pulp
bleaching
order
compound
containing pulp
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.)
Granted
Application number
CA2121387A
Other languages
French (fr)
Other versions
CA2121387C (en
Inventor
Lillemor Holtinger
Jiri Basta
Wenche Hermansson
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.)
Nouryon Pulp and Performance Chemicals AB
Original Assignee
Eka Nobel 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=CA2121387(A1) "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 Nobel AB filed Critical Eka Nobel AB
Publication of CA2121387A1 publication Critical patent/CA2121387A1/en
Application granted granted Critical
Publication of CA2121387C publication Critical patent/CA2121387C/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • D21C9/1005—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.
CA002121387A 1993-04-20 1994-04-15 Method for bleaching lignocellulose-containing pulp Expired - Fee Related CA2121387C (en)

Applications Claiming Priority (4)

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
SE9301293-8 1993-04-20
SE9301294-6 1993-04-20
SE9301293A SE501651E (en) 1993-04-20 1993-04-20 Pre-treatment of lignocellulosic pulp with magnesium and calcium compound before peroxide bleaching

Publications (2)

Publication Number Publication Date
CA2121387A1 true CA2121387A1 (en) 1994-10-21
CA2121387C CA2121387C (en) 1998-06-30

Family

ID=26661708

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002121387A Expired - Fee Related CA2121387C (en) 1993-04-20 1994-04-15 Method for bleaching lignocellulose-containing pulp

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
WO1996025552A1 (en) * 1995-02-17 1996-08-22 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
BE1010678A3 (en) * 1996-10-11 1998-11-03 Solvay Interox Method for the delignification and bleaching of a chemical paper pulp
BE1010617A3 (en) * 1996-09-11 1998-11-03 Solvay Interox Paper pulp bleaching method
BR9711743A (en) * 1996-09-11 1999-08-24 Solvay Interox Process of delignification and bleaching of chemical pulp
BE1010677A3 (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
DE69004492T3 (en) * 1989-06-06 2001-11-15 Eka Nobel Ab Process for bleaching pulps containing lignocellulose.
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
FI941764A (en) 1994-10-21
CA2121387C (en) 1998-06-30
BR9401526A (en) 1994-11-22
ATE184060T1 (en) 1999-09-15
NO941421L (en) 1994-10-21
NO941421D0 (en) 1994-04-19
EP0622491B1 (en) 1999-09-01
DE69420306D1 (en) 1999-10-07
EP0622491A2 (en) 1994-11-02
EP0622491B2 (en) 2002-07-17
FI941764A0 (en) 1994-04-15
NO302767B1 (en) 1998-04-20
EP0622491A3 (en) 1995-04-12
DE69420306T2 (en) 2000-04-20

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed