DE69216757D1 - Modification from a washing press for delignification using oxygen - Google Patents
Modification from a washing press for delignification using oxygenInfo
- Publication number
- DE69216757D1 DE69216757D1 DE69216757T DE69216757T DE69216757D1 DE 69216757 D1 DE69216757 D1 DE 69216757D1 DE 69216757 T DE69216757 T DE 69216757T DE 69216757 T DE69216757 T DE 69216757T DE 69216757 D1 DE69216757 D1 DE 69216757D1
- Authority
- DE
- Germany
- Prior art keywords
- pulp
- oxygen
- consistency
- delignification
- alkaline material
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Lifetime
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
- D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
-
- 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
- D21C9/1005—Pretreatment of the pulp, e.g. degassing the pulp
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
- Television Systems (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Detergent Compositions (AREA)
- Gas Separation By Absorption (AREA)
Abstract
Unbleached pulp is washed with an aqueous alkaline solution in a wash press to substantially uniformly distribute a first amount of alkaline material throughout the pulp. The consistency of the pulp exiting the wash press is above about 18%, preferably between 25 to 35 percent by weight, and the high consistency alkali containing pulp is then treated with oxygen to effect delignification. The use of a wash press reduces the overall amounts of alkaline material utilized in the process compared to processes which add alkaline material to the pulp at low consistency. Additional alkali may be applied, if desired, onto the high consistency pulp prior to oxygen delignification to provide a total amount of between 0.8 and 7 percent by weight of oven dry pulp. High strength, low lignin pulps are formed after oxygen delignification which may be further bleached to high brightness with reduced amounts of bleaching chemicals.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US78418491A | 1991-10-29 | 1991-10-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE69216757D1 true DE69216757D1 (en) | 1997-02-27 |
Family
ID=25131607
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE69216757T Expired - Lifetime DE69216757D1 (en) | 1991-10-29 | 1992-10-22 | Modification from a washing press for delignification using oxygen |
Country Status (14)
Country | Link |
---|---|
EP (1) | EP0540091B1 (en) |
JP (1) | JPH05195466A (en) |
KR (1) | KR960006125B1 (en) |
CN (1) | CN1080343A (en) |
AT (1) | ATE147808T1 (en) |
AU (1) | AU647973B2 (en) |
BR (1) | BR9204173A (en) |
CA (1) | CA2081398C (en) |
DE (1) | DE69216757D1 (en) |
FI (1) | FI924751A (en) |
NO (1) | NO924080L (en) |
NZ (1) | NZ244837A (en) |
SE (1) | SE9203113L (en) |
ZA (1) | ZA928294B (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2282849C (en) | 1997-03-07 | 2004-07-13 | Akzo Nobel N.V. | Process for treating wastewater |
EP0863113A1 (en) * | 1997-03-07 | 1998-09-09 | Akzo Nobel N.V. | Process for treating wastewater |
FI122241B (en) | 2007-06-15 | 2011-10-31 | Andritz Oy | Procedure in connection with pulp washing at a pulp mill |
CA2802237C (en) | 2010-06-10 | 2018-02-13 | Packaging Corporation Of America | Method of manufacturing pulp for corrugated medium |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0211945A4 (en) * | 1985-02-14 | 1987-07-06 | Edward Francis Elton | Method and apparatus for alkaline delignification of lignocellulosic fibrous materials. |
US5173153A (en) * | 1991-01-03 | 1992-12-22 | Union Camp Patent Holding, Inc. | Process for enhanced oxygen delignification using high consistency and a split alkali addition |
US5085734A (en) * | 1989-02-15 | 1992-02-04 | Union Camp Patent Holding, Inc. | Methods of high consistency oxygen delignification using a low consistency alkali pretreatment |
JPH02289194A (en) * | 1989-04-20 | 1990-11-29 | Mitsubishi Paper Mills Ltd | Method for bleaching lignocellulosic substance with oxygen |
-
1992
- 1992-10-20 FI FI924751A patent/FI924751A/en not_active Application Discontinuation
- 1992-10-21 AU AU27168/92A patent/AU647973B2/en not_active Ceased
- 1992-10-21 NZ NZ244837A patent/NZ244837A/en unknown
- 1992-10-21 NO NO92924080A patent/NO924080L/en unknown
- 1992-10-22 EP EP92203241A patent/EP0540091B1/en not_active Expired - Lifetime
- 1992-10-22 DE DE69216757T patent/DE69216757D1/en not_active Expired - Lifetime
- 1992-10-22 AT AT92203241T patent/ATE147808T1/en not_active IP Right Cessation
- 1992-10-23 SE SE9203113A patent/SE9203113L/en not_active Application Discontinuation
- 1992-10-26 CA CA002081398A patent/CA2081398C/en not_active Expired - Fee Related
- 1992-10-27 ZA ZA928294A patent/ZA928294B/en unknown
- 1992-10-27 BR BR929204173A patent/BR9204173A/en not_active Application Discontinuation
- 1992-10-28 KR KR1019920019881A patent/KR960006125B1/en active IP Right Grant
- 1992-10-29 CN CN92113767A patent/CN1080343A/en active Pending
- 1992-10-29 JP JP4291469A patent/JPH05195466A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
SE9203113D0 (en) | 1992-10-23 |
AU2716892A (en) | 1993-05-20 |
CN1080343A (en) | 1994-01-05 |
NZ244837A (en) | 1994-10-26 |
ZA928294B (en) | 1993-05-18 |
JPH05195466A (en) | 1993-08-03 |
EP0540091B1 (en) | 1997-01-15 |
ATE147808T1 (en) | 1997-02-15 |
NO924080L (en) | 1993-04-30 |
FI924751A0 (en) | 1992-10-20 |
FI924751A (en) | 1993-04-30 |
CA2081398C (en) | 1997-03-25 |
CA2081398A1 (en) | 1993-04-30 |
KR960006125B1 (en) | 1996-05-09 |
BR9204173A (en) | 1993-05-04 |
AU647973B2 (en) | 1994-03-31 |
KR930008238A (en) | 1993-05-21 |
EP0540091A1 (en) | 1993-05-05 |
SE9203113L (en) | 1993-04-30 |
NO924080D0 (en) | 1992-10-21 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8332 | No legal effect for de |