SE9403396L - Bleaching of pulp - Google Patents
Bleaching of pulpInfo
- Publication number
- SE9403396L SE9403396L SE9403396A SE9403396A SE9403396L SE 9403396 L SE9403396 L SE 9403396L SE 9403396 A SE9403396 A SE 9403396A SE 9403396 A SE9403396 A SE 9403396A SE 9403396 L SE9403396 L SE 9403396L
- 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 |
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 |
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. |
BR9509253A BR9509253A (en) | 1994-10-07 | 1995-10-05 | Chlorine-free pulley bleaching process |
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 |
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 |
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 |
FI971401A FI971401A (en) | 1994-10-07 | 1997-04-04 | Treatment of chemical pulp with chelating agent and oxidizing agent during bleaching |
NO971536A NO971536D0 (en) | 1994-10-07 | 1997-04-04 | Treatment of chemical pulp with a chelating agent and an oxidizing agent in connection with 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 SE9403396D0 (en) | 1994-10-07 |
SE9403396L true 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) | FI971401A (en) |
NO (1) | NO971536D0 (en) |
SE (1) | SE504826C2 (en) |
WO (1) | WO1996011298A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE1010617A3 (en) * | 1996-09-11 | 1998-11-03 | Solvay Interox | Paper pulp bleaching method |
BR9711743A (en) * | 1996-09-11 | 1999-08-24 | Solvay Interox | Process of delignification and bleaching of chemical pulp |
BE1010678A3 (en) * | 1996-10-11 | 1998-11-03 | Solvay Interox | Method for the delignification and bleaching of a chemical 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 |
EP0402335B2 (en) * | 1989-06-06 | 2001-03-14 | Eka Chemicals AB | Process for bleaching lignocellulose-containing pulps |
-
1994
- 1994-10-07 SE SE9403396A patent/SE504826C2/en not_active IP Right Cessation
-
1995
- 1995-10-05 WO PCT/SE1995/001135 patent/WO1996011298A1/en not_active Application Discontinuation
- 1995-10-05 CA CA 2199257 patent/CA2199257A1/en not_active Abandoned
- 1995-10-05 AU AU37124/95A patent/AU686024B2/en not_active Ceased
- 1995-10-05 EP EP95934912A patent/EP0784720A1/en not_active Withdrawn
- 1995-10-05 CN CN 95195457 patent/CN1159842A/en active Pending
- 1995-10-05 JP JP8512520A patent/JPH10506965A/en active Pending
- 1995-10-05 BR BR9509253A patent/BR9509253A/en not_active Application Discontinuation
-
1997
- 1997-04-04 FI FI971401A patent/FI971401A/en unknown
- 1997-04-04 NO NO971536A patent/NO971536D0/en unknown
Also Published As
Publication number | Publication date |
---|---|
NO971536L (en) | 1997-04-04 |
FI971401A0 (en) | 1997-04-04 |
NO971536D0 (en) | 1997-04-04 |
BR9509253A (en) | 1997-10-21 |
SE504826C2 (en) | 1997-05-12 |
JPH10506965A (en) | 1998-07-07 |
EP0784720A1 (en) | 1997-07-23 |
CA2199257A1 (en) | 1996-04-18 |
CN1159842A (en) | 1997-09-17 |
AU3712495A (en) | 1996-05-02 |
WO1996011298A1 (en) | 1996-04-18 |
AU686024B2 (en) | 1998-01-29 |
FI971401A (en) | 1997-04-04 |
SE9403396D0 (en) | 1994-10-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
ATE30143T1 (en) | METHOD OF CONTROLLING AN ANAEROBIC PROCESS. | |
FI941764A0 (en) | Process for bleaching lignocellulosic pulp | |
ES532773A0 (en) | DIRECT HEAT TREATMENT METHOD OF A STEEL BAR | |
SE9403396D0 (en) | Bleaching of pulp | |
PH30783A (en) | Method for treatment of waste water by activated sludge process. | |
PH25521A (en) | Method for treatment of waste water by activated slduge process | |
BR9306963A (en) | Process water treatment method | |
ATE151824T1 (en) | DIGESTATION PROCESS | |
SE9502962L (en) | Treatment of pulp with complexing agents in at least two mixing steps without intermediate washing | |
DE3370498D1 (en) | Process for the anti-felt treatment of keratinous fibres consisting of a basic oxidation catalyzed by a metal salt, and fibres obtained according to the process | |
SE9503004L (en) | Bleaching of pulp | |
SE9501623D0 (en) | Bleaching of pulp | |
SE9303066L (en) | Bleaching of chemical pulp whereby the pulp is treated with complexing agents before and after an ozone step | |
FI934705A0 (en) | FOERFARANDE FOER BLEKNING AV LIGNOCELLULOSAHALTIG MASS | |
SE9604094L (en) | Bleaching of pulp with chlorine dioxide, alkali and complexing agents without intermediate washes | |
SE501325E (en) | Process for chlorine-free bleaching of pulp, wherein the pulp is acidified with acetic acid in the treatment with complexing agents | |
SE9700030L (en) | Treatment of pulp with complexing agents in at least one mixing step, without the use of the bleaching tower | |
FI944350A0 (en) | Method for enzymatic treatment of chemical pulp before bleaching | |
SE9301294D0 (en) | METHOD FOR BLACKING OF LIGNOCELLULOSALLY MACHINE | |
CS598188A1 (en) | Method of waste waters treatment during antroquinone dyes production | |
DE3886859D1 (en) | Ballast for a washing machine tub and method of making the ballast. |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
NUG | Patent has lapsed |
Ref document number: 9403396-6 Format of ref document f/p: F |