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SE9401628L - Oxygen delignification procedure - Google Patents

Oxygen delignification procedure

Info

Publication number
SE9401628L
SE9401628L SE9401628A SE9401628A SE9401628L SE 9401628 L SE9401628 L SE 9401628L SE 9401628 A SE9401628 A SE 9401628A SE 9401628 A SE9401628 A SE 9401628A SE 9401628 L SE9401628 L SE 9401628L
Authority
SE
Sweden
Prior art keywords
oxygen
gas
delignification
bars
carried out
Prior art date
Application number
SE9401628A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE9401628D0 (en
Inventor
Klas Norborg
Christer Sjoelin
Brita Swan
Original Assignee
Stora Kopparbergs Bergslags 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
Application filed by Stora Kopparbergs Bergslags Ab filed Critical Stora Kopparbergs Bergslags Ab
Priority to SE9401628A priority Critical patent/SE9401628L/en
Publication of SE9401628D0 publication Critical patent/SE9401628D0/en
Priority to PCT/SE1995/001335 priority patent/WO1997017489A1/en
Publication of SE9401628L publication Critical patent/SE9401628L/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 method of oxygen-gas delignifying chemical pulps, wherein the oxygen-gas delignification process is carried out at an oxygen-gas pressure above 10 bars. According to one preferred embodiment, the oxygen-gas delignification process is carried out at an oxygen-gas pressure from 15 bars, preferably at 15-20 bars. The oxygen-gas delignification process is carried out on non-bleached pulp or on pulp that is first subjected to oxygen-gas delignification and optionally also to ozone delignification. The pulp may also have been treated with a chelating agent in at least one position in the process.
SE9401628A 1994-05-10 1994-05-10 Oxygen delignification procedure SE9401628L (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SE9401628A SE9401628L (en) 1994-05-10 1994-05-10 Oxygen delignification procedure
PCT/SE1995/001335 WO1997017489A1 (en) 1994-05-10 1995-11-09 Process for oxygen delignification

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9401628A SE9401628L (en) 1994-05-10 1994-05-10 Oxygen delignification procedure
PCT/SE1995/001335 WO1997017489A1 (en) 1994-05-10 1995-11-09 Process for oxygen delignification

Publications (2)

Publication Number Publication Date
SE9401628D0 SE9401628D0 (en) 1994-05-10
SE9401628L true SE9401628L (en) 1995-11-11

Family

ID=26662052

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9401628A SE9401628L (en) 1994-05-10 1994-05-10 Oxygen delignification procedure

Country Status (2)

Country Link
SE (1) SE9401628L (en)
WO (1) WO1997017489A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2391011A (en) * 2002-07-19 2004-01-28 Crosmill Ltd Bleaching cellulose suspensions
SE528726C2 (en) * 2004-12-30 2007-01-30 Kvaerner Pulping Tech Oxygen delignification of cellulose pulp into a high pressure part and a low pressure part
SE526843C2 (en) * 2004-12-30 2005-11-08 Kvaerner Pulping Tech Continuous alkaline oxygen delignification of pulp, using multi reactor system with high pressure reactor part
SE526707C2 (en) * 2004-12-30 2005-10-25 Kvaerner Pulping Tech Continuous alkaline oxygen gas delignification of pulp, uses reactor system divided into high and low pressure runs

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1601408A (en) * 1967-06-20 1970-08-24
SE335053B (en) * 1969-05-13 1971-05-10 Mo Och Domsjoe Ab
CA897361A (en) * 1969-12-19 1972-04-11 E. Mallett Samuel Oxygen bleaching process
US5179021A (en) * 1989-02-10 1993-01-12 Gil Inc. (Now Ici Canada Inc.) Pulp bleaching process comprising oxygen delignification and xylanase enzyme treatment
US5091054A (en) * 1989-08-18 1992-02-25 Degussa Corporation Process for bleaching and delignification of lignocellulosic

Also Published As

Publication number Publication date
SE9401628D0 (en) 1994-05-10
WO1997017489A1 (en) 1997-05-15

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