ATE103649T1 - PROCESS FOR CHLORINE-FREE BLEACHING AND DELIGNIFICATION OF PULP. - Google Patents
PROCESS FOR CHLORINE-FREE BLEACHING AND DELIGNIFICATION OF PULP.Info
- Publication number
- ATE103649T1 ATE103649T1 AT91101890T AT91101890T ATE103649T1 AT E103649 T1 ATE103649 T1 AT E103649T1 AT 91101890 T AT91101890 T AT 91101890T AT 91101890 T AT91101890 T AT 91101890T AT E103649 T1 ATE103649 T1 AT E103649T1
- Authority
- AT
- Austria
- Prior art keywords
- delignification
- cyanamide
- content
- pulp
- chlorine
- 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
- D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
-
- 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
- D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes
-
- 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)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Gyroscopes (AREA)
- Eye Examination Apparatus (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Cereal-Derived Products (AREA)
Abstract
Cl-free bleaching and delignification of cellulose pre-bleached with O2 and peroxide, or O2 and O3, involves a 2-stage treatment with peroxide activated with cyanamide and/or cyanamide salts. - In the first stage, the content of cyanamide and/or cyanamide salts is 0.05-0.5 (0.07-0.33) wt.%, and the peroxide content is 0.1-1 wt.%, both w.r.t. dry wt. of cellulose. In the second stage, the content of cyanamide is 0.01-0.3 (0.03-0.23) wt.%, and the peroxide content is 0.1-0.7 wt.%, w.r.t. dry wt. of cellulose. Both stages are at pH 10-12, solids content of 5-30 (7-20) wt.%, and 40-90 (55-80) deg.C, for 1-6h for each stage.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4004364A DE4004364A1 (en) | 1990-02-13 | 1990-02-13 | Bleaching and delignifying pre-balanced cellulose - in two stages with peroxide activated with cyanamide or cyanamide salt, avoiding agents contg. chlorine |
| EP91101890A EP0442425B1 (en) | 1990-02-13 | 1991-02-11 | Process for the chlorine-free bleaching and delignification of pulp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ATE103649T1 true ATE103649T1 (en) | 1994-04-15 |
Family
ID=6400030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AT91101890T ATE103649T1 (en) | 1990-02-13 | 1991-02-11 | PROCESS FOR CHLORINE-FREE BLEACHING AND DELIGNIFICATION OF PULP. |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0442425B1 (en) |
| AT (1) | ATE103649T1 (en) |
| CA (1) | CA2036173C (en) |
| DE (2) | DE4004364A1 (en) |
| ES (1) | ES2051531T3 (en) |
| FI (1) | FI910703A (en) |
| NO (1) | NO176329C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4031597A1 (en) * | 1990-10-05 | 1992-04-09 | Sueddeutsche Kalkstickstoff | METHOD FOR LOW-CHLORINE BLEACHING AND DELIGNIFICATION OF CELLULAR |
| CA2099881A1 (en) * | 1991-01-03 | 1992-07-04 | Omar F. Ali | Chlorine-free process for bleaching lignocellulosic pulp |
| DE4138006A1 (en) * | 1991-11-19 | 1993-05-27 | Degussa | METHOD FOR IMPROVING THE WHITE CONTENT IN THE PEROXIDE BLEACHING OF CELLULAS BY THE ADDITION OF CYANATES |
| US5620563A (en) * | 1994-10-31 | 1997-04-15 | Pulp Paper Res Inst | Process for delignification and bleaching of chemical wood pulps with hydrogen peroxide and a dicyandiamide activator |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4196043A (en) * | 1970-12-21 | 1980-04-01 | Scott Paper Company | Kraft pulp bleaching and recovery process |
| DE3544398A1 (en) * | 1985-12-16 | 1987-06-19 | Sueddeutsche Kalkstickstoff | METHOD FOR THE BLEACHING AND DELIGNIFICATION OF CELLULAR-BASED PRODUCTS |
| DE3714107A1 (en) * | 1987-04-28 | 1988-11-10 | Sueddeutsche Kalkstickstoff | Process for eliminating residual hydrogen peroxide from aqueous solutions |
| DE3802401A1 (en) * | 1988-01-28 | 1989-08-03 | Degussa | METHOD FOR PRODUCING SEMI-BLEACHED FUEL |
-
1990
- 1990-02-13 DE DE4004364A patent/DE4004364A1/en active Granted
-
1991
- 1991-02-06 NO NO910458A patent/NO176329C/en unknown
- 1991-02-11 ES ES91101890T patent/ES2051531T3/en not_active Expired - Lifetime
- 1991-02-11 EP EP91101890A patent/EP0442425B1/en not_active Expired - Lifetime
- 1991-02-11 DE DE91101890T patent/DE59101249D1/en not_active Expired - Fee Related
- 1991-02-11 AT AT91101890T patent/ATE103649T1/en not_active IP Right Cessation
- 1991-02-12 CA CA002036173A patent/CA2036173C/en not_active Expired - Fee Related
- 1991-02-13 FI FI910703A patent/FI910703A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| ES2051531T3 (en) | 1994-06-16 |
| NO910458L (en) | 1991-08-14 |
| DE4004364C2 (en) | 1992-11-19 |
| CA2036173A1 (en) | 1991-08-14 |
| CA2036173C (en) | 1996-01-23 |
| EP0442425A1 (en) | 1991-08-21 |
| FI910703A0 (en) | 1991-02-13 |
| FI910703A (en) | 1991-08-14 |
| DE59101249D1 (en) | 1994-05-05 |
| NO176329C (en) | 1995-03-15 |
| EP0442425B1 (en) | 1994-03-30 |
| DE4004364A1 (en) | 1991-08-14 |
| NO176329B (en) | 1994-12-05 |
| NO910458D0 (en) | 1991-02-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| REN | Ceased due to non-payment of the annual fee |