BR9204173A - PROCESS FOR OBTAINING A BETTER SELECTIVITY OF A PULP DURING HIGH OXYGEN CONSISTENCY DRAIGNIFICATION, AND A PROCESS FOR OBTAINING A NON-WHITENED PULLEY DESIGNIFICATION DURING THE DELIGNIFICATION OF ELEVEN - Google Patents
PROCESS FOR OBTAINING A BETTER SELECTIVITY OF A PULP DURING HIGH OXYGEN CONSISTENCY DRAIGNIFICATION, AND A PROCESS FOR OBTAINING A NON-WHITENED PULLEY DESIGNIFICATION DURING THE DELIGNIFICATION OF ELEVENInfo
- Publication number
- BR9204173A BR9204173A BR929204173A BR9204173A BR9204173A BR 9204173 A BR9204173 A BR 9204173A BR 929204173 A BR929204173 A BR 929204173A BR 9204173 A BR9204173 A BR 9204173A BR 9204173 A BR9204173 A BR 9204173A
- Authority
- BR
- Brazil
- Prior art keywords
- pulp
- obtaining
- consistency
- delignification
- draignification
- Prior art date
Links
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title abstract 4
- 238000000034 method Methods 0.000 title abstract 4
- 229910052760 oxygen Inorganic materials 0.000 title abstract 4
- 239000001301 oxygen Substances 0.000 title abstract 4
- 230000008569 process Effects 0.000 title abstract 4
- 239000000463 material Substances 0.000 abstract 3
- 239000003513 alkali Substances 0.000 abstract 2
- 239000012670 alkaline solution Substances 0.000 abstract 1
- 238000004061 bleaching Methods 0.000 abstract 1
- 229920005610 lignin Polymers 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
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)
- Cleaning By Liquid Or Steam (AREA)
- Detergent Compositions (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
- Television Systems (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (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 |
|---|---|
| BR9204173A true BR9204173A (en) | 1993-05-04 |
Family
ID=25131607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BR929204173A BR9204173A (en) | 1991-10-29 | 1992-10-27 | PROCESS FOR OBTAINING A BETTER SELECTIVITY OF A PULP DURING HIGH OXYGEN CONSISTENCY DRAIGNIFICATION, AND A PROCESS FOR OBTAINING A NON-WHITENED PULLEY DESIGNIFICATION DURING THE DELIGNIFICATION OF ELEVEN |
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) | FI924751A7 (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 |
|---|---|---|---|---|
| EP0863113A1 (en) * | 1997-03-07 | 1998-09-09 | Akzo Nobel N.V. | Process for treating wastewater |
| US6425974B1 (en) | 1997-03-07 | 2002-07-30 | Akzo Nobel N.V. | Process for treating wastewater from a bleach plant |
| FI122241B (en) * | 2007-06-15 | 2011-10-31 | Andritz Oy | Procedure in connection with pulp washing at a pulp mill |
| US8961740B2 (en) | 2010-06-10 | 2015-02-24 | 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 |
| 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 |
| 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 |
| 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/FI924751A7/en not_active Application Discontinuation
- 1992-10-21 NO NO92924080A patent/NO924080L/en unknown
- 1992-10-21 AU AU27168/92A patent/AU647973B2/en not_active Ceased
- 1992-10-21 NZ NZ244837A patent/NZ244837A/en unknown
- 1992-10-22 DE DE69216757T patent/DE69216757D1/en not_active Expired - Lifetime
- 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
- 1992-10-23 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 not_active Expired - Lifetime
- 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 |
|---|---|
| KR960006125B1 (en) | 1996-05-09 |
| JPH05195466A (en) | 1993-08-03 |
| EP0540091B1 (en) | 1997-01-15 |
| CA2081398A1 (en) | 1993-04-30 |
| SE9203113D0 (en) | 1992-10-23 |
| DE69216757D1 (en) | 1997-02-27 |
| AU647973B2 (en) | 1994-03-31 |
| KR930008238A (en) | 1993-05-21 |
| ATE147808T1 (en) | 1997-02-15 |
| ZA928294B (en) | 1993-05-18 |
| CN1080343A (en) | 1994-01-05 |
| NZ244837A (en) | 1994-10-26 |
| AU2716892A (en) | 1993-05-20 |
| FI924751A7 (en) | 1993-04-30 |
| NO924080D0 (en) | 1992-10-21 |
| CA2081398C (en) | 1997-03-25 |
| FI924751A0 (en) | 1992-10-20 |
| SE9203113L (en) | 1993-04-30 |
| EP0540091A1 (en) | 1993-05-05 |
| NO924080L (en) | 1993-04-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EE | Request for examination | ||
| FB36 | Technical and formal requirements: requirement - article 36 of industrial property law | ||
| FA8 | Dismissal: dismissal - article 36, par. 1 of industrial property law |