SE9302011D0 - REACTOR FOR OZONE WHITING - Google Patents
REACTOR FOR OZONE WHITINGInfo
- 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
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.
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111386367B (en) | 2017-12-20 | 2021-11-09 | 尤妮佳股份有限公司 | Method and apparatus for manufacturing recycled pulp fibers |
CN111556967B (en) * | 2017-12-20 | 2023-04-04 | 尤妮佳股份有限公司 | Method for producing recycled pulp fibers |
Family Cites Families (4)
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 |
EP0148220A4 (en) * | 1983-06-14 | 1985-10-17 | Weyerhaeuser Co | Low consistency ozone bleaching reactor. |
-
1993
- 1993-06-11 SE SE9302011A patent/SE502666C2/en not_active IP Right Cessation
-
1994
- 1994-06-06 WO PCT/SE1994/000542 patent/WO1994029513A1/en active Application Filing
- 1994-06-06 AU AU70117/94A patent/AU7011794A/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
AU7011794A (en) | 1995-01-03 |
WO1994029513A1 (en) | 1994-12-22 |
SE502666C2 (en) | 1995-12-04 |
SE9302011L (en) | 1994-12-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
NUG | Patent has lapsed |