CA2032315A1 - Process for Bleaching of Chemical Cellulose Pulp - Google Patents
Process for Bleaching of Chemical Cellulose PulpInfo
- Publication number
- CA2032315A1 CA2032315A1 CA2032315A CA2032315A CA2032315A1 CA 2032315 A1 CA2032315 A1 CA 2032315A1 CA 2032315 A CA2032315 A CA 2032315A CA 2032315 A CA2032315 A CA 2032315A CA 2032315 A1 CA2032315 A1 CA 2032315A1
- Authority
- CA
- Canada
- Prior art keywords
- pulp
- bleaching
- ozone
- chlorine dioxide
- 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
- 238000004061 bleaching Methods 0.000 title abstract 4
- 238000000034 method Methods 0.000 title abstract 3
- 229920002678 cellulose Polymers 0.000 title 1
- 239000001913 cellulose Substances 0.000 title 1
- 239000000126 substance Substances 0.000 title 1
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 abstract 6
- 239000004155 Chlorine dioxide Substances 0.000 abstract 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 abstract 3
- 235000019398 chlorine dioxide Nutrition 0.000 abstract 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract 2
- 239000001301 oxygen Substances 0.000 abstract 2
- 229910052760 oxygen Inorganic materials 0.000 abstract 2
- 229920001131 Pulp (paper) Polymers 0.000 abstract 1
- 239000007864 aqueous solution Substances 0.000 abstract 1
- 239000007844 bleaching agent Substances 0.000 abstract 1
- 230000007613 environmental effect Effects 0.000 abstract 1
- 229920005610 lignin Polymers 0.000 abstract 1
- 239000007800 oxidant agent Substances 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
- 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
- D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
- D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites
- D21C9/144—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites with ClO2/Cl2 and other bleaching agents in a multistage process
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
Up to now, full scale use of the from the environmen-tal point of view excellent bleaching agent ozone, has been hampered e.g. by the comparatively large amounts required and the excessive depolymerization of the pulp. The present invention aims at solving these problems and relates to a three-step method for bleaching chemical pulp with a lignin content corresponding to a kappa number not exceeding 10.
This method is characterized in that the bleaching begins with a chlorine dioxide step at a comparatively high pulp consistency, and that the pulp, after the bulk of chlorine dioxide has been consumed, is intimately contacted with an ozone-containing aqueous solution and brought to react with the ozone at a considerably lower pulp consistency than in the chlorine dioxide bleaching, whereupon the pulp under-goes an alkaline treatment in the presence of oxygen and/or an oxidizing agent giving off oxygen.
This method is characterized in that the bleaching begins with a chlorine dioxide step at a comparatively high pulp consistency, and that the pulp, after the bulk of chlorine dioxide has been consumed, is intimately contacted with an ozone-containing aqueous solution and brought to react with the ozone at a considerably lower pulp consistency than in the chlorine dioxide bleaching, whereupon the pulp under-goes an alkaline treatment in the presence of oxygen and/or an oxidizing agent giving off oxygen.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE8904247A SE465224B (en) | 1989-12-18 | 1989-12-18 | Bleaching chemical cellulose pulp with chlorine dioxide and ozone |
| SE8904247-7 | 1989-12-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2032315A1 true CA2032315A1 (en) | 1991-06-19 |
| CA2032315C CA2032315C (en) | 1997-04-15 |
Family
ID=20377792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002032315A Expired - Fee Related CA2032315C (en) | 1989-12-18 | 1990-12-14 | Process for bleaching of chemical cellulose pulp |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA2032315C (en) |
| FI (1) | FI906196A (en) |
| SE (1) | SE465224B (en) |
-
1989
- 1989-12-18 SE SE8904247A patent/SE465224B/en not_active IP Right Cessation
-
1990
- 1990-12-14 CA CA002032315A patent/CA2032315C/en not_active Expired - Fee Related
- 1990-12-14 FI FI906196A patent/FI906196A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| CA2032315C (en) | 1997-04-15 |
| SE465224B (en) | 1991-08-12 |
| SE8904247L (en) | 1991-06-19 |
| FI906196A0 (en) | 1990-12-14 |
| SE8904247D0 (en) | 1989-12-18 |
| FI906196A (en) | 1991-06-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |