CA2036173A1 - Process for the chlorine-free bleaching and delignification of cellulose - Google Patents
Process for the chlorine-free bleaching and delignification of celluloseInfo
- Publication number
- CA2036173A1 CA2036173A1 CA2036173A CA2036173A CA2036173A1 CA 2036173 A1 CA2036173 A1 CA 2036173A1 CA 2036173 A CA2036173 A CA 2036173A CA 2036173 A CA2036173 A CA 2036173A CA 2036173 A1 CA2036173 A1 CA 2036173A1
- Authority
- CA
- Canada
- Prior art keywords
- cellulose
- delignification
- chlorine
- free bleaching
- oxygen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229920002678 cellulose Polymers 0.000 title abstract 3
- 239000001913 cellulose Substances 0.000 title abstract 3
- 238000004061 bleaching Methods 0.000 title abstract 2
- 238000000034 method Methods 0.000 title abstract 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract 2
- 229910052760 oxygen Inorganic materials 0.000 abstract 2
- 239000001301 oxygen Substances 0.000 abstract 2
- 150000002978 peroxides Chemical class 0.000 abstract 2
- XZMCDFZZKTWFGF-UHFFFAOYSA-N Cyanamide Chemical compound NC#N XZMCDFZZKTWFGF-UHFFFAOYSA-N 0.000 abstract 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 abstract 1
- 150000001912 cyanamides Chemical class 0.000 abstract 1
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)
- Gyroscopes (AREA)
- Eye Examination Apparatus (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
Abstract
The present invention provides a process for the chlorine-free bleaching and delignification of cellulose pre-bleached with oxygen and peroxide or oxygen and or ozone, wherein the pre-bleached cellulose is treated twice with peroxide activated by cyanamide and/or a cyanamide salt.
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 |
DEP4004364.9 | 1990-02-13 |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2036173A1 true CA2036173A1 (en) | 1991-08-14 |
CA2036173C CA2036173C (en) | 1996-01-23 |
Family
ID=6400030
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002036173A Expired - Fee Related CA2036173C (en) | 1990-02-13 | 1991-02-12 | Process for the chlorine-free bleaching and delignification of cellulose |
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) | FI910703L (en) |
NO (1) | NO176329C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
Families Citing this family (3)
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 |
EP0565625A1 (en) * | 1991-01-03 | 1993-10-20 | 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 |
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/FI910703L/en not_active Application Discontinuation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
Also Published As
Publication number | Publication date |
---|---|
NO910458L (en) | 1991-08-14 |
CA2036173C (en) | 1996-01-23 |
NO176329C (en) | 1995-03-15 |
DE4004364A1 (en) | 1991-08-14 |
DE59101249D1 (en) | 1994-05-05 |
NO910458D0 (en) | 1991-02-06 |
ES2051531T3 (en) | 1994-06-16 |
ATE103649T1 (en) | 1994-04-15 |
FI910703A7 (en) | 1991-08-14 |
FI910703L (en) | 1991-08-14 |
NO176329B (en) | 1994-12-05 |
EP0442425B1 (en) | 1994-03-30 |
FI910703A0 (en) | 1991-02-13 |
EP0442425A1 (en) | 1991-08-21 |
DE4004364C2 (en) | 1992-11-19 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |