NO176329C - Process for chlorine-free bleaching and delignification of chemical pulp - Google Patents
Process for chlorine-free bleaching and delignification of chemical pulpInfo
- Publication number
- NO176329C NO176329C NO910458A NO910458A NO176329C NO 176329 C NO176329 C NO 176329C NO 910458 A NO910458 A NO 910458A NO 910458 A NO910458 A NO 910458A NO 176329 C NO176329 C NO 176329C
- Authority
- NO
- Norway
- Prior art keywords
- delignification
- chlorine
- cyanamide
- content
- free 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
- D21C9/147—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)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Cereal-Derived Products (AREA)
- Eye Examination Apparatus (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
- Gyroscopes (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 (1)
| 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 |
Publications (4)
| Publication Number | Publication Date |
|---|---|
| NO910458D0 NO910458D0 (en) | 1991-02-06 |
| NO910458L NO910458L (en) | 1991-08-14 |
| NO176329B NO176329B (en) | 1994-12-05 |
| NO176329C true NO176329C (en) | 1995-03-15 |
Family
ID=6400030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO910458A NO176329C (en) | 1990-02-13 | 1991-02-06 | Process for chlorine-free bleaching and delignification of chemical 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 |
| WO1992012289A1 (en) * | 1991-01-03 | 1992-07-23 | Union Camp Patent Holding, Inc. | 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 DE DE91101890T patent/DE59101249D1/en not_active Expired - Fee Related
- 1991-02-11 AT AT91101890T patent/ATE103649T1/en not_active IP Right Cessation
- 1991-02-11 ES ES91101890T patent/ES2051531T3/en not_active Expired - Lifetime
- 1991-02-11 EP EP91101890A patent/EP0442425B1/en not_active Expired - Lifetime
- 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 |
|---|---|
| FI910703A (en) | 1991-08-14 |
| NO910458D0 (en) | 1991-02-06 |
| ATE103649T1 (en) | 1994-04-15 |
| DE4004364C2 (en) | 1992-11-19 |
| EP0442425B1 (en) | 1994-03-30 |
| DE4004364A1 (en) | 1991-08-14 |
| EP0442425A1 (en) | 1991-08-21 |
| CA2036173C (en) | 1996-01-23 |
| ES2051531T3 (en) | 1994-06-16 |
| DE59101249D1 (en) | 1994-05-05 |
| NO910458L (en) | 1991-08-14 |
| FI910703A0 (en) | 1991-02-13 |
| NO176329B (en) | 1994-12-05 |
| CA2036173A1 (en) | 1991-08-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| SE7902901L (en) | OXYGEN LIGNIFIED BLOCK, CELLULOSIZED PULP WITH OZON | |
| FR2265908A1 (en) | Kraft pulp bleaching and recovery process - using alkali extraction effluents in subsequent bleaching steps | |
| SE9400277L (en) | oxygen / ozone / peracetic acid delignification and bleaching of cellulose pulp | |
| DK0496671T3 (en) | Enzymatic treatment of a chemical lignin cellulose pulp | |
| NO864983D0 (en) | PROCEDURE FOR THE WHEATING AND DELIGNIFICATION OF PRODUCTS CONTAINING CHEMICAL MASS. | |
| NO176329C (en) | Process for chlorine-free bleaching and delignification of chemical pulp | |
| NO962525L (en) | Process for preparing bleached cellulose pulp | |
| DE69100049D1 (en) | REDUCTION OF HALOGENED ORGANIC COMPOUNDS IN THE LEAKAGE DRAINAGE. | |
| ATE155541T1 (en) | PRODUCTION OF WHITE LENGTH AND DIVISION PROCESS | |
| NO961139L (en) | Chlorine-free chemical pulp bleaching by two-stage bleaching with chelating agent | |
| SE501253E8 (en) | Chlorine-free bleaching of chemical pulp | |
| NO920829L (en) | PROCEDURE FOR THE WHICH OF CHEMICAL MASS IN ALIFATIC MONOCARBOXYL ACIDS | |
| SE9300277D0 (en) | CHLORINE-FREE Mass Bleaching | |
| SE8107858L (en) | PROCEDURE FOR DELIGNIFICATING WHITE CELLULOSAMASSA | |
| SE9203859D0 (en) | CHLORINE-FREE Mass Bleaching | |
| FR2454478A1 (en) | Two=stage pulp bleaching - using chlorine di:oxide and chlorine in first stage and chlorine alone in second state (SE 17.11.80) | |
| NO913848L (en) | PROCEDURE FOR CHLORINE WHITE AND DELIGNIFICATION OF CELLULOSE | |
| RU96124423A (en) | CELLULOSE BLEACHING METHOD | |
| SE9500573D0 (en) | Bleaching pulp with peroxide at superatmospheric pressure and in multiple stages |