FI961279A - Chlorine-free chemical pulp bleaching comprising a two-stage treatment with chelating agent - Google Patents
Chlorine-free chemical pulp bleaching comprising a two-stage treatment with chelating agent Download PDFInfo
- Publication number
- FI961279A FI961279A FI961279A FI961279A FI961279A FI 961279 A FI961279 A FI 961279A FI 961279 A FI961279 A FI 961279A FI 961279 A FI961279 A FI 961279A FI 961279 A FI961279 A FI 961279A
- Authority
- FI
- Finland
- Prior art keywords
- chlorine
- chelating agent
- chemical pulp
- stage treatment
- pulp bleaching
- 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
- D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
- D21C9/153—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications with ozone
-
- 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
- D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9303066A SE501836C2 (en) | 1993-09-21 | 1993-09-21 | Bleaching of chemical pulp whereby the pulp is treated with complexing agents before and after an ozone step |
PCT/SE1994/000758 WO1995008666A1 (en) | 1993-09-21 | 1994-08-22 | Chlorine-free bleaching of chemical pulp involving a two stage treatment with chelating agent |
Publications (2)
Publication Number | Publication Date |
---|---|
FI961279A true FI961279A (en) | 1996-03-20 |
FI961279A0 FI961279A0 (en) | 1996-03-20 |
Family
ID=20391160
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FI961279A FI961279A0 (en) | 1993-09-21 | 1996-03-20 | Chlorine-free chemical pulp bleaching comprising a two-stage treatment with chelating agent |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0720675A1 (en) |
JP (1) | JPH09503028A (en) |
AU (1) | AU7792394A (en) |
BR (1) | BR9407555A (en) |
CA (1) | CA2168445A1 (en) |
FI (1) | FI961279A0 (en) |
NO (1) | NO961139D0 (en) |
SE (1) | SE501836C2 (en) |
WO (1) | WO1995008666A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE504803C2 (en) * | 1995-08-24 | 1997-04-28 | Sunds Defibrator Ind Ab | Treatment of pulp with complexing agents in at least two mixing steps without intermediate washing |
SE508239C2 (en) * | 1997-01-03 | 1998-09-21 | Sunds Defibrator Ind Ab | Treatment of pulp with complexing agents in at least one mixing step, without the use of the bleaching tower |
CN102587186B (en) * | 2012-03-20 | 2015-03-11 | 昆明理工大学 | Method for bleaching dendrocalamus giganteus chemical pulp |
RU2634586C1 (en) * | 2016-08-01 | 2017-10-31 | федеральное государственное бюджетное образовательное учреждение высшего образования "Пермский национальный исследовательский политехнический университет" | Method of bleaching hardwood sulphate cellulose |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002517173A (en) * | 1991-01-03 | 2002-06-11 | ユニオン キャンプ パテント ホウルディング インコーポレイテッド | Bleaching method of lignocellulose pulp without chlorine |
SE468355B (en) * | 1991-04-30 | 1992-12-21 | Eka Nobel Ab | CHEMISTRY OF CHEMICAL MASS THROUGH TREATMENT WITH COMPLEX PICTURES AND OZONE |
-
1993
- 1993-09-21 SE SE9303066A patent/SE501836C2/en unknown
-
1994
- 1994-08-22 WO PCT/SE1994/000758 patent/WO1995008666A1/en not_active Application Discontinuation
- 1994-08-22 EP EP94928521A patent/EP0720675A1/en not_active Ceased
- 1994-08-22 CA CA002168445A patent/CA2168445A1/en not_active Abandoned
- 1994-08-22 AU AU77923/94A patent/AU7792394A/en not_active Abandoned
- 1994-08-22 JP JP7509711A patent/JPH09503028A/en active Pending
- 1994-08-22 BR BR9407555A patent/BR9407555A/en not_active Application Discontinuation
-
1996
- 1996-03-20 NO NO961139A patent/NO961139D0/en unknown
- 1996-03-20 FI FI961279A patent/FI961279A0/en unknown
Also Published As
Publication number | Publication date |
---|---|
NO961139L (en) | 1996-03-20 |
AU7792394A (en) | 1995-04-10 |
SE9303066L (en) | 1995-03-22 |
WO1995008666A1 (en) | 1995-03-30 |
CA2168445A1 (en) | 1995-03-30 |
JPH09503028A (en) | 1997-03-25 |
BR9407555A (en) | 1996-12-31 |
SE501836C2 (en) | 1995-05-22 |
EP0720675A1 (en) | 1996-07-10 |
FI961279A0 (en) | 1996-03-20 |
SE9303066D0 (en) | 1993-09-21 |
NO961139D0 (en) | 1996-03-20 |
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