SE9302010L - ozone Bleaching - Google Patents

ozone Bleaching

Info

Publication number
SE9302010L
SE9302010L SE9302010A SE9302010A SE9302010L SE 9302010 L SE9302010 L SE 9302010L SE 9302010 A SE9302010 A SE 9302010A SE 9302010 A SE9302010 A SE 9302010A SE 9302010 L SE9302010 L SE 9302010L
Authority
SE
Sweden
Prior art keywords
ozone
gas
stirring
pulp
bleaching
Prior art date
Application number
SE9302010A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE9302010D0 (en
SE502665C2 (en
Inventor
Hasse Boerjesson
Christen Groenvold-Hansen
Axel Laemaas
Torbjoern Kvarnstroem
Ronny Hoeglund
Original Assignee
Kvaerner Pulping Tech
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 Kvaerner Pulping Tech filed Critical Kvaerner Pulping Tech
Priority to SE9302010A priority Critical patent/SE502665C2/en
Publication of SE9302010D0 publication Critical patent/SE9302010D0/en
Priority to PCT/SE1994/000543 priority patent/WO1994029514A1/en
Priority to AU70118/94A priority patent/AU7011894A/en
Publication of SE9302010L publication Critical patent/SE9302010L/en
Publication of SE502665C2 publication Critical patent/SE502665C2/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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/50—Pipe mixers, i.e. mixers wherein the materials to be mixed flow continuously through pipes, e.g. column mixers
    • 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
    • D21C9/153—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications with ozone

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)

Abstract

A method and reactor for bleaching pulp with ozone in a pressurized vessel (1), the ozone being mixed into the pulp by a mixer (4) to form a homogenous gas-pulp mixture, and then stirring said mixture at consecutive points along the bleaching line by devices (25) with agitators (26) to improve the reaction conditions. According to the invention the quantity of ozone amounts to at least 3 kg per ADMT, and the entire quantity of gas-pulp mixture passing through a cross-sectional area of the bleaching line is subjected to stirring so that the gas-pulp mixture finally contains less than 10 % of said quantity of ozone. Further the first stirring and each subsequent stirring take place from near 0 to about 10 seconds after the initial mixing and the previous stirring, respectively, with respect to the feed speed of the gas-pulp mixture. The bleaching is finished by reducing the pressure in the gas-pulp mixture to remove a carrier gas for ozone and any remaining ozone.
SE9302010A 1993-06-11 1993-06-11 Methods and reactor for ozone bleaching SE502665C2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE9302010A SE502665C2 (en) 1993-06-11 1993-06-11 Methods and reactor for ozone bleaching
PCT/SE1994/000543 WO1994029514A1 (en) 1993-06-11 1994-06-06 Ozone bleaching
AU70118/94A AU7011894A (en) 1993-06-11 1994-06-06 Ozone bleaching

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9302010A SE502665C2 (en) 1993-06-11 1993-06-11 Methods and reactor for ozone bleaching

Publications (3)

Publication Number Publication Date
SE9302010D0 SE9302010D0 (en) 1993-06-11
SE9302010L true SE9302010L (en) 1994-12-12
SE502665C2 SE502665C2 (en) 1995-12-04

Family

ID=20390244

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9302010A SE502665C2 (en) 1993-06-11 1993-06-11 Methods and reactor for ozone bleaching

Country Status (3)

Country Link
AU (1) AU7011894A (en)
SE (1) SE502665C2 (en)
WO (1) WO1994029514A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE504803C2 (en) * 1995-08-24 1997-04-28 Sunds Defibrator Ind Ab Treatment of pulp with complexing agents in at least two mixing steps without intermediate washing
EP0912236A1 (en) * 1996-06-03 1999-05-06 Beloit Technologies, Inc. High turbulence mixer
SE508239C2 (en) * 1997-01-03 1998-09-21 Sunds Defibrator Ind Ab Treatment of pulp with complexing agents in at least one mixing step, without the use of the bleaching tower
EP1586366A1 (en) 2004-04-13 2005-10-19 Sulzer Pumpen Ag A method, an apparatus and a rotor for homogenizing a medium
RU2456063C1 (en) * 2010-12-02 2012-07-20 Геннадий Анатольевич Шаталов Flow mixer of fluids and gases

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1801442A1 (en) * 1967-10-20 1969-05-29 Stadler Hurter Internat Ltd Agitator mixer
US3966542A (en) * 1974-09-20 1976-06-29 General Signal Corporation Multi-stage bleaching of pulp using successively lower power levels
US4080249A (en) * 1976-06-02 1978-03-21 International Paper Company Delignification and bleaching of a lignocellulosic pulp slurry with ozone

Also Published As

Publication number Publication date
WO1994029514A1 (en) 1994-12-22
SE9302010D0 (en) 1993-06-11
SE502665C2 (en) 1995-12-04
AU7011894A (en) 1995-01-03

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Legal Events

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