BR9609840A - Pulp bleaching process and apparatus with gaseous bleaching reagent - Google Patents
Pulp bleaching process and apparatus with gaseous bleaching reagentInfo
- Publication number
- BR9609840A BR9609840A BR9609840A BR9609840A BR9609840A BR 9609840 A BR9609840 A BR 9609840A BR 9609840 A BR9609840 A BR 9609840A BR 9609840 A BR9609840 A BR 9609840A BR 9609840 A BR9609840 A BR 9609840A
- Authority
- BR
- Brazil
- Prior art keywords
- pulp
- bleaching
- reagent
- vessel
- gaseous
- 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
-
- 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)
- Paper (AREA)
- Apparatus Associated With Microorganisms And Enzymes (AREA)
- Manipulator (AREA)
Abstract
A method and apparatus for bleaching pulp with a gaseous bleaching reagent. The pulp (18) is intensively mixed in the presence of the bleaching reagent within an upstream vessel comprising a fluffer/blower (12). Next, the pulp is agitated in the presence of the bleaching reagent within an intermediate vessel comprising an agitated mixer reactor (14). The pulp is then discharged to a downstream vessel, comprising a porous bed reactor (16), where it is further reacted with the bleaching reagent. The concentration of the gaseous bleaching reagent supplied to each vessel is separately controlled which, in combination with a controlled pulp residence time within at least the agitated mixer reactor and the porous bed reactor, results in an economy of energy utilization, a minimization of pulp particle damage due to mechanical mixing, and uniformity of pulp bleaching.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US144795P | 1995-07-26 | 1995-07-26 | |
PCT/US1996/012902 WO1997005327A1 (en) | 1995-07-26 | 1996-07-16 | Method and apparatus for bleaching pulp with a gaseous bleaching reagent |
Publications (1)
Publication Number | Publication Date |
---|---|
BR9609840A true BR9609840A (en) | 1999-03-09 |
Family
ID=21696060
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BR9609840A BR9609840A (en) | 1995-07-26 | 1996-07-16 | Pulp bleaching process and apparatus with gaseous bleaching reagent |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0840820B1 (en) |
JP (1) | JPH10510599A (en) |
AT (1) | ATE179469T1 (en) |
BR (1) | BR9609840A (en) |
CA (1) | CA2227690A1 (en) |
DE (1) | DE69602269T2 (en) |
WO (1) | WO1997005327A1 (en) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0492040A1 (en) * | 1990-12-21 | 1992-07-01 | Kamyr, Inc. | Tumbling ozone reactor for paper pulp |
EP0492039A1 (en) * | 1990-12-27 | 1992-07-01 | Kamyr, Inc. | Pneumatic reactor ozone bleaching of paper pulp |
CA2046717A1 (en) * | 1991-02-06 | 1992-08-07 | Beloit Technologies, Inc. | Method and apparatus for treating fibrous materials with a gaseous reagent |
DE69221385T2 (en) * | 1991-05-24 | 1997-12-11 | Union Camp Patent Holding, Inc., Wilmington, Del. | Two-stage pulp bleaching reactor and method for bleaching with ozone |
CA2151813A1 (en) * | 1992-12-18 | 1994-07-07 | Oscar Luthi | Method and apparatus for regulating wood pulp bleaching |
-
1996
- 1996-07-16 CA CA002227690A patent/CA2227690A1/en not_active Abandoned
- 1996-07-16 JP JP9507918A patent/JPH10510599A/en active Pending
- 1996-07-16 EP EP96928093A patent/EP0840820B1/en not_active Expired - Lifetime
- 1996-07-16 AT AT96928093T patent/ATE179469T1/en not_active IP Right Cessation
- 1996-07-16 BR BR9609840A patent/BR9609840A/en not_active Application Discontinuation
- 1996-07-16 WO PCT/US1996/012902 patent/WO1997005327A1/en active IP Right Grant
- 1996-07-16 DE DE69602269T patent/DE69602269T2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE69602269T2 (en) | 1999-09-16 |
EP0840820A1 (en) | 1998-05-13 |
CA2227690A1 (en) | 1997-02-13 |
DE69602269D1 (en) | 1999-06-02 |
JPH10510599A (en) | 1998-10-13 |
ATE179469T1 (en) | 1999-05-15 |
WO1997005327A1 (en) | 1997-02-13 |
EP0840820B1 (en) | 1999-04-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
FF | Decision: intention to grant | ||
FA11 | Dismissal: dismissal - article 38, par. 2 of industrial property law |