SE9302011D0 - REACTOR FOR OZONE WHITING - Google Patents

REACTOR FOR OZONE WHITING

Info

Publication number
SE9302011D0
SE9302011D0 SE9302011A SE9302011A SE9302011D0 SE 9302011 D0 SE9302011 D0 SE 9302011D0 SE 9302011 A SE9302011 A SE 9302011A SE 9302011 A SE9302011 A SE 9302011A SE 9302011 D0 SE9302011 D0 SE 9302011D0
Authority
SE
Sweden
Prior art keywords
ozone
gas
pulp
vessel
devices
Prior art date
Application number
SE9302011A
Other languages
Swedish (sv)
Other versions
SE9302011L (en
SE502666C2 (en
Inventor
*Boerjesson Hasse
*Groenvold-Hansen Christen
*Laemaas Axel
*Kvarnstroem Torbjoern
*Hoeglund Ronny
Original Assignee
Kamyr 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 Kamyr Ab filed Critical Kamyr Ab
Priority to SE9302011A priority Critical patent/SE502666C2/en
Publication of SE9302011D0 publication Critical patent/SE9302011D0/en
Priority to PCT/SE1994/000542 priority patent/WO1994029513A1/en
Priority to AU70117/94A priority patent/AU7011794A/en
Publication of SE9302011L publication Critical patent/SE9302011L/en
Publication of SE502666C2 publication Critical patent/SE502666C2/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
    • D21C9/153—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications with ozone
    • 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

Landscapes

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

Abstract

A reactor for bleaching pulp with ozone in a pressurized vessel (1), including a mixer (4) for mixing ozone into the pulp and devices (25) to stir the gas-pulp mixture including agitators (26). According to the invention each agitator stirs the entire quantity of gas-pulp mixture passing through a cross-sectional area of the vessel prior to the agitator, and the distance between the mixer and the first device (25) and between two consecutive devices is less than 8 times the diameter of the vessel. The stirring intensity of each device (25) and the number of devices are so adjusted to each other for a predetermined quantity of ozone supplied that the gas-pulp mixture at the outlet part (3) of said vessel contains less than 10 % of said quantity of ozone. Further, a pressure-reducing means (30) is arranged for removing gas from the treated gas-pulp mixture.
SE9302011A 1993-06-11 1993-06-11 Reactor with stirrer for ozone bleaching SE502666C2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE9302011A SE502666C2 (en) 1993-06-11 1993-06-11 Reactor with stirrer for ozone bleaching
PCT/SE1994/000542 WO1994029513A1 (en) 1993-06-11 1994-06-06 Reactor for ozone bleaching
AU70117/94A AU7011794A (en) 1993-06-11 1994-06-06 Reactor for ozone bleaching

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9302011A SE502666C2 (en) 1993-06-11 1993-06-11 Reactor with stirrer for ozone bleaching

Publications (3)

Publication Number Publication Date
SE9302011D0 true SE9302011D0 (en) 1993-06-11
SE9302011L SE9302011L (en) 1994-12-12
SE502666C2 SE502666C2 (en) 1995-12-04

Family

ID=20390245

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9302011A SE502666C2 (en) 1993-06-11 1993-06-11 Reactor with stirrer for ozone bleaching

Country Status (3)

Country Link
AU (1) AU7011794A (en)
SE (1) SE502666C2 (en)
WO (1) WO1994029513A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11131061B2 (en) 2017-12-20 2021-09-28 Unicharm Corporation Method for manufacturing recycled pulp fibers
US11802373B2 (en) * 2017-12-20 2023-10-31 Unicharm Corporation Method for evaluating degree of cleanliness of recycled material, method for manufacturing recycled material, and method for manufacturing recycled pulp fiber

Family Cites Families (4)

* 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
US4303470A (en) * 1979-06-15 1981-12-01 Weyerhaeuser Company Method and apparatus for mixing gases with a wood pulp slurry
WO1985000046A1 (en) * 1983-06-14 1985-01-03 Weyerhaeuser Company Low consistency ozone bleaching reactor

Also Published As

Publication number Publication date
SE9302011L (en) 1994-12-12
WO1994029513A1 (en) 1994-12-22
AU7011794A (en) 1995-01-03
SE502666C2 (en) 1995-12-04

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Legal Events

Date Code Title Description
NUG Patent has lapsed