NO302767B1 - Process of bleaching lignocellulosic pulp - Google Patents
Process of bleaching lignocellulosic pulpInfo
- Publication number
- NO302767B1 NO302767B1 NO941421A NO941421A NO302767B1 NO 302767 B1 NO302767 B1 NO 302767B1 NO 941421 A NO941421 A NO 941421A NO 941421 A NO941421 A NO 941421A NO 302767 B1 NO302767 B1 NO 302767B1
- Authority
- NO
- Norway
- Prior art keywords
- pulp
- bleaching
- order
- compound
- peroxide
- 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
- 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
- D21C9/1026—Other features in bleaching processes
- D21C9/1042—Use of chelating 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
- D21C9/16—Bleaching ; Apparatus therefor with per compounds
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Abstract
In a method for bleaching lignocellulose-containing pulp with a peroxide-containing compound, the pulp is, prior to the bleaching and in optional order, subjected to acid treatment at a pH of up to about 5 and treated with a complexing agent in order to release transition metal ions from their positions in the pulp. After the acid treatment, a magnesium compound and a calcium compound are added to the pulp at a pH of from about 3.5 to about 8 in order to reintroduce an optimum amount of magnesium and calcium ions into the pulp. The pulp is then bleached with a peroxide-containing compound at a pH of from about 7 to about 13.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9301294A SE501581E (en) | 1993-04-20 | 1993-04-20 | Pre-treatment of lignocellulosic pulp with magnesium and calcium compound before peroxide bleaching |
SE9301293A SE501651E (en) | 1993-04-20 | 1993-04-20 | Pre-treatment of lignocellulosic pulp with magnesium and calcium compound before peroxide bleaching |
Publications (3)
Publication Number | Publication Date |
---|---|
NO941421D0 NO941421D0 (en) | 1994-04-19 |
NO941421L NO941421L (en) | 1994-10-21 |
NO302767B1 true NO302767B1 (en) | 1998-04-20 |
Family
ID=26661708
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO941421A NO302767B1 (en) | 1993-04-20 | 1994-04-19 | Process of bleaching lignocellulosic pulp |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0622491B2 (en) |
AT (1) | ATE184060T1 (en) |
BR (1) | BR9401526A (en) |
CA (1) | CA2121387C (en) |
DE (1) | DE69420306T2 (en) |
FI (1) | FI941764A (en) |
NO (1) | NO302767B1 (en) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE502706E (en) | 1994-04-05 | 1999-09-27 | Mo Och Domsjoe Ab | Preparation of bleached cellulose pulp by bleaching with chlorine dioxide and treatment of complexing agents in the same step |
US6776876B1 (en) | 1994-10-13 | 2004-08-17 | Andritz Oy | Method of treating cellulosic pulp to remove hexenuronic acid |
CA2211223C (en) | 1995-02-17 | 2002-04-30 | Ahlstrom Machinery Oy | Method of pretreating pulp to be bleached with peroxide |
FI105701B (en) * | 1995-10-20 | 2000-09-29 | Ahlstrom Machinery Oy | Method and arrangement for treatment of pulp |
US6706143B1 (en) | 1996-03-19 | 2004-03-16 | International Paper Company | Minimizing chlorinated organics in pulp bleaching processes |
BE1010617A3 (en) * | 1996-09-11 | 1998-11-03 | Solvay Interox | Paper pulp bleaching method |
BE1010678A3 (en) * | 1996-10-11 | 1998-11-03 | Solvay Interox | Method for the delignification and bleaching of a chemical paper pulp |
BE1010677A3 (en) * | 1996-10-11 | 1998-11-03 | Solvay Interox | Method for the delignification and bleaching of a chemical paper pulp |
BR9711743A (en) * | 1996-09-11 | 1999-08-24 | Solvay Interox | Process of delignification and bleaching of chemical pulp |
BE1010679A3 (en) * | 1996-10-11 | 1998-11-03 | Solvay Interox | Delignification process and laundering pulp chemicals. |
BE1011784A3 (en) * | 1998-03-10 | 2000-01-11 | Solvay | Bleaching pulp process. |
SE0200981D0 (en) * | 2002-03-28 | 2002-03-28 | Eka Chemicals Ab | Process for bleaching lignocellulose-containing non-wood pulp |
DE10320618A1 (en) * | 2003-05-08 | 2004-11-18 | Papierfabrik Albbruck Gmbh & Co. Kg | Process for bleaching fibrous materials |
JP4967451B2 (en) | 2006-05-17 | 2012-07-04 | 三菱瓦斯化学株式会社 | Method for producing bleached pulp |
US20080110584A1 (en) * | 2006-11-15 | 2008-05-15 | Caifang Yin | Bleaching process with at least one extraction stage |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE420430B (en) † | 1978-02-17 | 1981-10-05 | Mo Och Domsjoe Ab | PROCEDURE FOR WHEATING AND EXTRACTION OF LIGNOCELLULOSALLY MATERIALS WITH PEROXID CONTAINING BLACKS |
FR2557605B1 (en) * | 1983-12-29 | 1987-12-11 | Atochem | PROCESS FOR BLEACHING PAPER PULP BY HYDROGEN PEROXIDE |
DE69004492T3 (en) * | 1989-06-06 | 2001-11-15 | Eka Nobel Ab, Bohus | Process for bleaching pulps containing lignocellulose. |
SE468355B (en) * | 1991-04-30 | 1992-12-21 | Eka Nobel Ab | CHEMISTRY OF CHEMICAL MASS THROUGH TREATMENT WITH COMPLEX PICTURES AND OZONE |
SE470065C (en) * | 1991-04-30 | 1996-01-15 | Eka Nobel Ab | Treatment of chemical pulp with an acid and then a magnesium and calcium compound in chlorine-free bleaching |
-
1994
- 1994-04-05 EP EP94200924A patent/EP0622491B2/en not_active Expired - Lifetime
- 1994-04-05 DE DE69420306T patent/DE69420306T2/en not_active Expired - Lifetime
- 1994-04-05 AT AT94200924T patent/ATE184060T1/en not_active IP Right Cessation
- 1994-04-15 FI FI941764A patent/FI941764A/en unknown
- 1994-04-15 CA CA002121387A patent/CA2121387C/en not_active Expired - Fee Related
- 1994-04-18 BR BR9401526A patent/BR9401526A/en not_active Application Discontinuation
- 1994-04-19 NO NO941421A patent/NO302767B1/en unknown
Also Published As
Publication number | Publication date |
---|---|
EP0622491A2 (en) | 1994-11-02 |
CA2121387A1 (en) | 1994-10-21 |
DE69420306D1 (en) | 1999-10-07 |
CA2121387C (en) | 1998-06-30 |
FI941764A (en) | 1994-10-21 |
DE69420306T2 (en) | 2000-04-20 |
ATE184060T1 (en) | 1999-09-15 |
EP0622491A3 (en) | 1995-04-12 |
NO941421D0 (en) | 1994-04-19 |
EP0622491B1 (en) | 1999-09-01 |
FI941764A0 (en) | 1994-04-15 |
BR9401526A (en) | 1994-11-22 |
NO941421L (en) | 1994-10-21 |
EP0622491B2 (en) | 2002-07-17 |
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