SE9302010L - ozone Bleaching - Google Patents
ozone BleachingInfo
- 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
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.
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)
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)
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 |
-
1993
- 1993-06-11 SE SE9302010A patent/SE502665C2/en not_active IP Right Cessation
-
1994
- 1994-06-06 AU AU70118/94A patent/AU7011894A/en not_active Abandoned
- 1994-06-06 WO PCT/SE1994/000543 patent/WO1994029514A1/en active Application Filing
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
Date | Code | Title | Description |
---|---|---|---|
NUG | Patent has lapsed |