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SE9900425D0 - Pulp delignification process - Google Patents

Pulp delignification process

Info

Publication number
SE9900425D0
SE9900425D0 SE9900425A SE9900425A SE9900425D0 SE 9900425 D0 SE9900425 D0 SE 9900425D0 SE 9900425 A SE9900425 A SE 9900425A SE 9900425 A SE9900425 A SE 9900425A SE 9900425 D0 SE9900425 D0 SE 9900425D0
Authority
SE
Sweden
Prior art keywords
pulp
oxygen
alkali
aqueous solution
unit operation
Prior art date
Application number
SE9900425A
Other languages
Swedish (sv)
Other versions
SE9900425L (en
Inventor
Disa Tormund
Mikael Lindstroem
Fredrik Berthold
Original Assignee
Svenska Traeforskningsinst
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 Svenska Traeforskningsinst filed Critical Svenska Traeforskningsinst
Priority to SE9900425A priority Critical patent/SE9900425L/en
Publication of SE9900425D0 publication Critical patent/SE9900425D0/en
Priority to AU29524/00A priority patent/AU2952400A/en
Priority to PCT/SE2000/000172 priority patent/WO2000047813A1/en
Priority to EP00908150A priority patent/EP1161593A1/en
Publication of SE9900425L publication Critical patent/SE9900425L/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
    • D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

A process for oxygen delignification of chemical pulp comprising an oxygen treatment unit operation stage in which the pulp is treated while suspended in an aqueous solution with oxygen in the presence of alkali, whereby the pulp consistency is less than 20%; more than 50 percentage by weight of the alkali consist of one or more carbonates; and the pH of the aqueous solution during the process is adapted to provide for the essential absence of bicarbonate in said solution during the treatment. Furthermore a process for the bleaching of chemical pulp comprising a peroxide bleaching unit operation stage and an oxygen delignification process of said kind.
SE9900425A 1999-02-09 1999-02-09 Pulp Delignification Procedure SE9900425L (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
SE9900425A SE9900425L (en) 1999-02-09 1999-02-09 Pulp Delignification Procedure
AU29524/00A AU2952400A (en) 1999-02-09 2000-01-28 Oxygen delignification of pulp in the presence of carbonates as alkali
PCT/SE2000/000172 WO2000047813A1 (en) 1999-02-09 2000-01-28 Oxygen delignification of pulp in the presence of carbonates as alkali
EP00908150A EP1161593A1 (en) 1999-02-09 2000-01-28 Oxygen delignification of pulp in the presence of carbonates as alkali

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9900425A SE9900425L (en) 1999-02-09 1999-02-09 Pulp Delignification Procedure

Publications (2)

Publication Number Publication Date
SE9900425D0 true SE9900425D0 (en) 1999-02-09
SE9900425L SE9900425L (en) 2000-09-04

Family

ID=20414399

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9900425A SE9900425L (en) 1999-02-09 1999-02-09 Pulp Delignification Procedure

Country Status (4)

Country Link
EP (1) EP1161593A1 (en)
AU (1) AU2952400A (en)
SE (1) SE9900425L (en)
WO (1) WO2000047813A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EA006819B1 (en) * 2001-06-29 2006-04-28 Фойт Пэйпер Файбер Системз Гмбх Унд Ко. Кг Method for delignifying lignocellulosic raw materials
DE10323376A1 (en) * 2003-05-21 2004-12-16 Voith Paper Fiber Systems Gmbh & Co. Kg Delignification procedure
FI20070126A0 (en) 2006-09-08 2007-02-13 Linde Ag Process for de-pulping and using carbon dioxide or (bi) carbonate for this

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE219677C1 (en) *
GB1262655A (en) * 1968-09-20 1972-02-02 Canadian Ind Bleaching of wood pulp
FI48764C (en) * 1973-05-30 1977-07-26 Ahlstroem Oy Method and apparatus for bleaching cellulose pulp with molecular weight.

Also Published As

Publication number Publication date
AU2952400A (en) 2000-08-29
EP1161593A1 (en) 2001-12-12
SE9900425L (en) 2000-09-04
WO2000047813A1 (en) 2000-08-17

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Legal Events

Date Code Title Description
NAV Patent application has lapsed