ZA928294B - Wash press modification for oxygen delignification process. - Google Patents
Wash press modification for oxygen delignification process.Info
- Publication number
- ZA928294B ZA928294B ZA928294A ZA928294A ZA928294B ZA 928294 B ZA928294 B ZA 928294B ZA 928294 A ZA928294 A ZA 928294A ZA 928294 A ZA928294 A ZA 928294A ZA 928294 B ZA928294 B ZA 928294B
- Authority
- ZA
- South Africa
- Prior art keywords
- pulp
- wash press
- consistency
- oxygen delignification
- alkaline material
- 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
- D21C9/02—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)
- Gas Separation By Absorption (AREA)
- Detergent Compositions (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (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 |
|---|---|
| ZA928294B true ZA928294B (en) | 1993-05-18 |
Family
ID=25131607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ZA928294A ZA928294B (en) | 1991-10-29 | 1992-10-27 | Wash press modification for oxygen delignification process. |
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 |
|---|---|---|---|---|
| AU6641498A (en) | 1997-03-07 | 1998-09-22 | 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 |
| EP2910678B1 (en) | 2010-06-10 | 2017-07-26 | Packaging Corporation Of America | Method of manufacturing pulp for corrugated medium |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR8605554A (en) * | 1985-02-14 | 1987-04-22 | Edward Francis Elton | PROCESS FOR THE PRODUCTION OF PAPER AND APPARATUS FOR THE ALKALINE DESIGNIFICATION OF LIGNO-CELLULOSIC 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 NO NO92924080A patent/NO924080L/en unknown
- 1992-10-21 NZ NZ244837A patent/NZ244837A/en unknown
- 1992-10-21 AU AU27168/92A patent/AU647973B2/en not_active Ceased
- 1992-10-22 EP EP92203241A patent/EP0540091B1/en not_active Expired - Lifetime
- 1992-10-22 AT AT92203241T patent/ATE147808T1/en not_active IP Right Cessation
- 1992-10-22 DE DE69216757T patent/DE69216757D1/en not_active Expired - Lifetime
- 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 BR BR929204173A patent/BR9204173A/en not_active Application Discontinuation
- 1992-10-27 ZA ZA928294A patent/ZA928294B/en unknown
- 1992-10-28 KR KR1019920019881A patent/KR960006125B1/en active IP Right Grant
- 1992-10-29 JP JP4291469A patent/JPH05195466A/en active Pending
- 1992-10-29 CN CN92113767A patent/CN1080343A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| ATE147808T1 (en) | 1997-02-15 |
| SE9203113D0 (en) | 1992-10-23 |
| AU647973B2 (en) | 1994-03-31 |
| CA2081398C (en) | 1997-03-25 |
| FI924751A0 (en) | 1992-10-20 |
| AU2716892A (en) | 1993-05-20 |
| JPH05195466A (en) | 1993-08-03 |
| BR9204173A (en) | 1993-05-04 |
| CA2081398A1 (en) | 1993-04-30 |
| FI924751A (en) | 1993-04-30 |
| KR930008238A (en) | 1993-05-21 |
| SE9203113L (en) | 1993-04-30 |
| DE69216757D1 (en) | 1997-02-27 |
| EP0540091B1 (en) | 1997-01-15 |
| NO924080D0 (en) | 1992-10-21 |
| KR960006125B1 (en) | 1996-05-09 |
| NZ244837A (en) | 1994-10-26 |
| EP0540091A1 (en) | 1993-05-05 |
| NO924080L (en) | 1993-04-30 |
| CN1080343A (en) | 1994-01-05 |
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