SE9403396D0 - Bleaching of pulp - Google Patents
Bleaching of pulpInfo
- Publication number
- SE9403396D0 SE9403396D0 SE9403396A SE9403396A SE9403396D0 SE 9403396 D0 SE9403396 D0 SE 9403396D0 SE 9403396 A SE9403396 A SE 9403396A SE 9403396 A SE9403396 A SE 9403396A SE 9403396 D0 SE9403396 D0 SE 9403396D0
- Authority
- SE
- Sweden
- Prior art keywords
- pulp
- bleaching
- chelating agent
- agent
- metals
- 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
- D21C9/1026—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
- D21C9/1005—Pretreatment of the pulp, e.g. degassing the pulp
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Detergent Compositions (AREA)
Abstract
A method of chlorine free bleaching of pulp where the metals in the pulp are removed by means of a chelating agent. The pulp is treated with the chelating agent at a pH 2-7 for a period of 5 minutes to 2 hours. The chelating agent is activated by the addition of an oxidizing agent. After the treatment the pulp is washed.
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9403396A SE504826C2 (en) | 1994-10-07 | 1994-10-07 | Treatment of chemical pulp with complexing agents in the presence of an oxidizing agent |
EP95934912A EP0784720A1 (en) | 1994-10-07 | 1995-10-05 | Treatment of chemical pulp with a chelating agent and an oxidizing agent in connection with bleaching |
JP8512520A JPH10506965A (en) | 1994-10-07 | 1995-10-05 | Treatment of chemical pulp with chelating and oxidizing agents related to bleaching. |
CA 2199257 CA2199257A1 (en) | 1994-10-07 | 1995-10-05 | Treatment of chemical pulp with a chelating agent and an oxidizing agent in connection with bleaching |
AU37124/95A AU686024B2 (en) | 1994-10-07 | 1995-10-05 | Treatment of chemical pulp with a chelating agent and an oxidizing agent in connection with bleaching |
PCT/SE1995/001135 WO1996011298A1 (en) | 1994-10-07 | 1995-10-05 | Treatment of chemical pulp with a chelating agent and an oxidizing agent in connection with bleaching |
CN 95195457 CN1159842A (en) | 1994-10-07 | 1995-10-05 | Treatment of chemical pulp with a chelating agent and an oxidizing agent in connection with bleaching |
BR9509253A BR9509253A (en) | 1994-10-07 | 1995-10-05 | Chlorine-free pulley bleaching process |
NO971536A NO971536L (en) | 1994-10-07 | 1997-04-04 | Treatment of chemical pulp with a chelating agent and an oxidizing agent in connection with bleaching |
FI971401A FI971401A0 (en) | 1994-10-07 | 1997-04-04 | Treatment of chemical pulp with chelating agent and oxidizing agent during bleaching |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9403396A SE504826C2 (en) | 1994-10-07 | 1994-10-07 | Treatment of chemical pulp with complexing agents in the presence of an oxidizing agent |
Publications (3)
Publication Number | Publication Date |
---|---|
SE9403396D0 true SE9403396D0 (en) | 1994-10-07 |
SE9403396L SE9403396L (en) | 1996-04-08 |
SE504826C2 SE504826C2 (en) | 1997-05-12 |
Family
ID=20395512
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE9403396A SE504826C2 (en) | 1994-10-07 | 1994-10-07 | Treatment of chemical pulp with complexing agents in the presence of an oxidizing agent |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP0784720A1 (en) |
JP (1) | JPH10506965A (en) |
CN (1) | CN1159842A (en) |
AU (1) | AU686024B2 (en) |
BR (1) | BR9509253A (en) |
CA (1) | CA2199257A1 (en) |
FI (1) | FI971401A0 (en) |
NO (1) | NO971536L (en) |
SE (1) | SE504826C2 (en) |
WO (1) | WO1996011298A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE1010678A3 (en) * | 1996-10-11 | 1998-11-03 | Solvay Interox | Method for the delignification and bleaching of a chemical paper pulp |
BE1010617A3 (en) * | 1996-09-11 | 1998-11-03 | Solvay Interox | Paper pulp bleaching method |
WO1998011295A1 (en) * | 1996-09-11 | 1998-03-19 | Solvay Interox (Societe Anonyme) | Method for bleaching paper pulp |
Family Cites Families (2)
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 |
DE69004492T3 (en) * | 1989-06-06 | 2001-11-15 | Eka Nobel Ab | Process for bleaching pulps containing lignocellulose. |
-
1994
- 1994-10-07 SE SE9403396A patent/SE504826C2/en not_active IP Right Cessation
-
1995
- 1995-10-05 JP JP8512520A patent/JPH10506965A/en active Pending
- 1995-10-05 CA CA 2199257 patent/CA2199257A1/en not_active Abandoned
- 1995-10-05 EP EP95934912A patent/EP0784720A1/en not_active Withdrawn
- 1995-10-05 BR BR9509253A patent/BR9509253A/en not_active Application Discontinuation
- 1995-10-05 WO PCT/SE1995/001135 patent/WO1996011298A1/en not_active Application Discontinuation
- 1995-10-05 CN CN 95195457 patent/CN1159842A/en active Pending
- 1995-10-05 AU AU37124/95A patent/AU686024B2/en not_active Ceased
-
1997
- 1997-04-04 NO NO971536A patent/NO971536L/en unknown
- 1997-04-04 FI FI971401A patent/FI971401A0/en unknown
Also Published As
Publication number | Publication date |
---|---|
JPH10506965A (en) | 1998-07-07 |
BR9509253A (en) | 1997-10-21 |
SE9403396L (en) | 1996-04-08 |
EP0784720A1 (en) | 1997-07-23 |
FI971401A (en) | 1997-04-04 |
NO971536D0 (en) | 1997-04-04 |
CA2199257A1 (en) | 1996-04-18 |
AU3712495A (en) | 1996-05-02 |
FI971401A0 (en) | 1997-04-04 |
NO971536L (en) | 1997-04-04 |
AU686024B2 (en) | 1998-01-29 |
WO1996011298A1 (en) | 1996-04-18 |
SE504826C2 (en) | 1997-05-12 |
CN1159842A (en) | 1997-09-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
NUG | Patent has lapsed |
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