ATE106961T1 - BLEACHING PROCESS FOR THE PRODUCTION OF HIGH WHITE PULP. - Google Patents
BLEACHING PROCESS FOR THE PRODUCTION OF HIGH WHITE PULP.Info
- Publication number
- ATE106961T1 ATE106961T1 AT90905400T AT90905400T ATE106961T1 AT E106961 T1 ATE106961 T1 AT E106961T1 AT 90905400 T AT90905400 T AT 90905400T AT 90905400 T AT90905400 T AT 90905400T AT E106961 T1 ATE106961 T1 AT E106961T1
- Authority
- AT
- Austria
- Prior art keywords
- production
- bleaching process
- high white
- white pulp
- stage
- 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
- D21C9/1057—Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Detergent Compositions (AREA)
- Treatment Of Fiber Materials (AREA)
Abstract
A process for the bleaching of mechanical and chemimechanical pulps which includes the steps of treating in a first stage the pulp with a reducing agent and subsequently treating the same pulp with a peroxygen compound in a second stage followed by a subsequent treatment with a peroxygen compound in a third stage.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA000594763A CA1340348C (en) | 1989-03-23 | 1989-03-23 | Bleaching process for the production of high bright pulps |
Publications (1)
Publication Number | Publication Date |
---|---|
ATE106961T1 true ATE106961T1 (en) | 1994-06-15 |
Family
ID=4139806
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT90905400T ATE106961T1 (en) | 1989-03-23 | 1990-03-22 | BLEACHING PROCESS FOR THE PRODUCTION OF HIGH WHITE PULP. |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0464110B1 (en) |
AT (1) | ATE106961T1 (en) |
CA (1) | CA1340348C (en) |
DE (1) | DE69009750D1 (en) |
WO (1) | WO1990011403A1 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USH1690H (en) * | 1995-07-20 | 1997-11-04 | Nye; Jeffrey | Process for bleaching kraft pulp |
FI105932B (en) * | 1996-05-30 | 2000-10-31 | Kemira Chemicals Oy | A process for bleaching high yield or recycled pulp |
US20030062138A1 (en) * | 2001-05-09 | 2003-04-03 | Hache Maurice Joseph Albert | Method for brightening mechanical pulps |
EP1418269B1 (en) * | 2002-11-05 | 2009-02-11 | Rohm And Haas Company | Method for brightening virgin mechanical pulp |
FI122239B (en) | 2004-02-25 | 2011-10-31 | Kemira Oyj | Process for treating fibrous material and new composition |
FI120201B (en) | 2004-05-12 | 2009-07-31 | Kemira Oyj | A novel composition and method for treating a fibrous material |
US7967948B2 (en) | 2006-06-02 | 2011-06-28 | International Paper Company | Process for non-chlorine oxidative bleaching of mechanical pulp in the presence of optical brightening agents |
US20100224333A1 (en) | 2009-03-09 | 2010-09-09 | Prasad Duggirala | Method and chemical composition to improve efficiency of mechanical pulp |
US9932709B2 (en) | 2013-03-15 | 2018-04-03 | Ecolab Usa Inc. | Processes and compositions for brightness improvement in paper production |
CN104237211B (en) * | 2014-09-23 | 2016-09-28 | 中国科学院长春应用化学研究所 | A kind of luminol chemiluminescence system and luminol, thiourea dioxide, the assay method of concentration of cobalt ions |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1249402A (en) * | 1984-12-21 | 1989-01-31 | Pulp And Paper Research Institute Of Canada | Multistage brightening of high yield and ultra high- yield wood pulps |
SE8600615L (en) * | 1985-02-15 | 1986-08-16 | Kamyr Ab | HIGH LIGHTNESS ASTADCOMMATED BY BLACKING OF MECHANICAL MASS, SUCH AS CHEMICAL-MECHANICAL MASS (CMP), CHEMICAL-THERMAL-MECHANICAL MASS (CTMP) AND SIMILAR |
-
1989
- 1989-03-23 CA CA000594763A patent/CA1340348C/en not_active Expired - Fee Related
-
1990
- 1990-03-22 AT AT90905400T patent/ATE106961T1/en not_active IP Right Cessation
- 1990-03-22 DE DE69009750T patent/DE69009750D1/en not_active Expired - Lifetime
- 1990-03-22 EP EP90905400A patent/EP0464110B1/en not_active Expired - Lifetime
- 1990-03-22 WO PCT/CA1990/000097 patent/WO1990011403A1/en active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
DE69009750D1 (en) | 1994-07-14 |
WO1990011403A1 (en) | 1990-10-04 |
EP0464110B1 (en) | 1994-06-08 |
EP0464110A1 (en) | 1992-01-08 |
CA1340348C (en) | 1999-01-26 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
RER | Ceased as to paragraph 5 lit. 3 law introducing patent treaties |