SE9803474L - Oxygen bleaching of pulp - Google Patents

Oxygen bleaching of pulp

Info

Publication number
SE9803474L
SE9803474L SE9803474A SE9803474A SE9803474L SE 9803474 L SE9803474 L SE 9803474L SE 9803474 A SE9803474 A SE 9803474A SE 9803474 A SE9803474 A SE 9803474A SE 9803474 L SE9803474 L SE 9803474L
Authority
SE
Sweden
Prior art keywords
reactor
pulp
pressure
regulating valve
level
Prior art date
Application number
SE9803474A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE9803474D0 (en
Inventor
Per Aastroem
Rune Larsson
Per-Aake Soedersten
Monica Bokstroem
Original Assignee
Valmet Fibertech 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 Valmet Fibertech Ab filed Critical Valmet Fibertech Ab
Priority to SE9803474A priority Critical patent/SE9803474L/en
Publication of SE9803474D0 publication Critical patent/SE9803474D0/en
Priority to JP2000574767A priority patent/JP2002526684A/en
Priority to PCT/SE1999/001761 priority patent/WO2000020678A1/en
Priority to EP99956419A priority patent/EP1155183A1/en
Priority to BR9914337-2A priority patent/BR9914337A/en
Publication of SE9803474L publication Critical patent/SE9803474L/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
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1052—Controlling the process
    • 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

The present invention relates to a method of oxygen gas delignifying lignocelllulosic pulp material in two stages, where a regulation occurs in that in the first reactor, the pressure in the top of the reactor as well as the level of pulp in the reactor are kept constant with the aid of two regulating valves (1 and 2). The first regulating valve (1) is placed in the top of the reactor and the second regulating valve (2) is placed immediately beneath the level of pulp. The first regulating valve (1) is controlled partly by the gas pressure and partly by the pressure difference measured between a first pressure sensor (3) located in the top of the reactor and a second pressure sensor (4) located in the upper part of the reactor and below the level of pulp. The second regulating valve (2) is controlled by the pressure in the top of the reactor such as to maintain the pressure at a desired level. The major part of the gas is discharged through the first regulating valve (1).
SE9803474A 1998-10-08 1998-10-08 Oxygen bleaching of pulp SE9803474L (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
SE9803474A SE9803474L (en) 1998-10-08 1998-10-08 Oxygen bleaching of pulp
JP2000574767A JP2002526684A (en) 1998-10-08 1999-10-04 Oxygen bleaching of pulp
PCT/SE1999/001761 WO2000020678A1 (en) 1998-10-08 1999-10-04 Oxygen gas bleaching of pulp
EP99956419A EP1155183A1 (en) 1998-10-08 1999-10-04 Oxygen gas bleaching of pulp
BR9914337-2A BR9914337A (en) 1998-10-08 1999-10-04 Pulp material delignification process containing lignocellulose by oxygen gas in two stages

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9803474A SE9803474L (en) 1998-10-08 1998-10-08 Oxygen bleaching of pulp

Publications (2)

Publication Number Publication Date
SE9803474D0 SE9803474D0 (en) 1998-10-08
SE9803474L true SE9803474L (en) 2000-04-09

Family

ID=20412917

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9803474A SE9803474L (en) 1998-10-08 1998-10-08 Oxygen bleaching of pulp

Country Status (5)

Country Link
EP (1) EP1155183A1 (en)
JP (1) JP2002526684A (en)
BR (1) BR9914337A (en)
SE (1) SE9803474L (en)
WO (1) WO2000020678A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2185734B1 (en) 2007-07-25 2011-03-23 Haarslev A/S A method and a system for the pretreatment of lignocellulosic material

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5411633A (en) * 1991-04-30 1995-05-02 Kamyr, Inc. Medium consistency pulp ozone bleaching
ZA924351B (en) * 1991-06-27 1993-03-31 Ahlstroem Oy Ozone bleaching process
SE505141C2 (en) * 1995-10-23 1997-06-30 Sunds Defibrator Ind Ab Oxygen delignification of pulp in two stages with high loading of alkali and oxygen and temperature below 90 C in the first step
JP2000507317A (en) * 1996-03-26 2000-06-13 シユンドス・デフイブラトール・インダストリーズ・アクテイエボラーグ Pulp delignification with oxygen in two steps.

Also Published As

Publication number Publication date
WO2000020678A1 (en) 2000-04-13
SE9803474D0 (en) 1998-10-08
EP1155183A1 (en) 2001-11-21
BR9914337A (en) 2001-06-26
JP2002526684A (en) 2002-08-20

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Legal Events

Date Code Title Description
NAV Patent application has lapsed