FI941764A0 - Process for bleaching lignocellulosic pulp - Google Patents

Process for bleaching lignocellulosic pulp

Info

Publication number
FI941764A0
FI941764A0 FI941764A FI941764A FI941764A0 FI 941764 A0 FI941764 A0 FI 941764A0 FI 941764 A FI941764 A FI 941764A FI 941764 A FI941764 A FI 941764A FI 941764 A0 FI941764 A0 FI 941764A0
Authority
FI
Finland
Prior art keywords
pulp
bleaching
order
compound
peroxide
Prior art date
Application number
FI941764A
Other languages
Finnish (fi)
Swedish (sv)
Other versions
FI941764A (en
Inventor
Lillemor Holtinger
Jiri Basta
Wenche Hermansson
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=FI941764(A0) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from SE9301293A external-priority patent/SE501651E/en
Priority claimed from SE9301294A external-priority patent/SE501581E/en
Application filed by Eka Nobel Ab filed Critical Eka Nobel Ab
Publication of FI941764A0 publication Critical patent/FI941764A0/en
Publication of FI941764A publication Critical patent/FI941764A/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

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)

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.
FI941764A 1993-04-20 1994-04-15 Method for bleaching lignocellulosic pulp FI941764A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9301293A SE501651E (en) 1993-04-20 1993-04-20 Pre-treatment of lignocellulosic pulp with magnesium and calcium compound before peroxide bleaching
SE9301294A SE501581E (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
FI941764A0 true FI941764A0 (en) 1994-04-15
FI941764A FI941764A (en) 1994-10-21

Family

ID=26661708

Family Applications (1)

Application Number Title Priority Date Filing Date
FI941764A FI941764A (en) 1993-04-20 1994-04-15 Method for bleaching lignocellulosic 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 1999-09-27 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
EP0858526A1 (en) * 1995-02-17 1998-08-19 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
RU2189412C2 (en) * 1996-09-11 2002-09-20 Солвей Интерокс (Сосьете Аноним) Method of bleaching paper pulp
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
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
EP0402335B2 (en) * 1989-06-06 2001-03-14 Eka Chemicals AB Process for bleaching lignocellulose-containing pulps
SE470065C (en) * 1991-04-30 1996-01-15 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
DE69420306D1 (en) 1999-10-07
CA2121387C (en) 1998-06-30
EP0622491A2 (en) 1994-11-02
EP0622491B1 (en) 1999-09-01
ATE184060T1 (en) 1999-09-15
BR9401526A (en) 1994-11-22
NO302767B1 (en) 1998-04-20
NO941421L (en) 1994-10-21
CA2121387A1 (en) 1994-10-21
EP0622491B2 (en) 2002-07-17
FI941764A (en) 1994-10-21
EP0622491A3 (en) 1995-04-12
NO941421D0 (en) 1994-04-19
DE69420306T2 (en) 2000-04-20

Similar Documents

Publication Publication Date Title
ATE173518T1 (en) METHOD FOR BLEACHING PULP CONTAINING LIGNOCELLULOSE
FI941764A0 (en) Process for bleaching lignocellulosic pulp
FI902773A0 (en) FOERFARANDE VID BLEKNING AV LIGNOCELLULOSAHALTIG MASS.
ATE130888T1 (en) METHOD FOR BLEACHING MATERIAL CONTAINING LIGNOCELLULOSE.
MY132667A (en) Process for the bleaching of pulp
BR9306963A (en) Process water treatment method
SE9203200L (en) Process for bleaching lignocellulosic pulp
NO975038L (en) Treatment of pulp with chelating agent and subsequent bleaching at a pH above 9
SE9403396L (en) Bleaching of pulp
SE8902058L (en) PROCEDURES FOR THE WHITING OF LIGNOCELLULOSA-CONTAINING MATERIAL
SE9301294D0 (en) METHOD FOR BLACKING OF LIGNOCELLULOSALLY MACHINE