GB1242709A - Bleaching of cellulosic pulp - Google Patents
Bleaching of cellulosic pulpInfo
- Publication number
- GB1242709A GB1242709A GB59738/68A GB5973868A GB1242709A GB 1242709 A GB1242709 A GB 1242709A GB 59738/68 A GB59738/68 A GB 59738/68A GB 5973868 A GB5973868 A GB 5973868A GB 1242709 A GB1242709 A GB 1242709A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulp
- weight
- cellulosic
- bleaching
- dec
- 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.)
- Expired
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
- D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
- D21C9/123—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with Cl2O
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
1,242,709. Bleaching cellulosic pulp. PULP & PAPER RESEARCH INSTITUTE OF CANADA. 2 Dec., 1969 [16 Dec., 1968], No. 59738/68. Heading D1P. Fibrous cellulosic pulp, e.g. that obtained by the kraft and sulphite process is bleached by contacting a high consistency (i.e. of about 15% by weight) pulp in the form of fluffed or shredded fibres with gaseous chlorine monoxide. The pulp preferably has at least 15% by weight cellulosic content. Throughout the reaction, which may last for 1-60 minutes, the pH of the pulp is maintained in the range 3.5-5.5 and the temperature between 20‹C and 50‹C. Degradation in the viscosity of the pulp is reduced by including ammonia or sulphonic acid in the pulp, or up to 0.05% by weight chlorine dioxide in the chlorine monoxide. The chlorine monoxide may be diluted with a non-reactive gas, e.g. air to a partial pressure below 253 mm. of mercury.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB59738/68A GB1242709A (en) | 1968-12-16 | 1968-12-16 | Bleaching of cellulosic pulp |
| US882819A US3619349A (en) | 1968-12-16 | 1969-12-08 | Bleaching of shredded or fluffed cellulosic pulp with gaseous chlorine monoxide |
| NO04945/69A NO127544B (en) | 1968-12-16 | 1969-12-15 | |
| SE17239/69A SE365831B (en) | 1968-12-16 | 1969-12-15 | |
| FI693632A FI50644C (en) | 1968-12-16 | 1969-12-15 | Bleaching of cellulose pulp in gas phase with chlorine monoxide. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB59738/68A GB1242709A (en) | 1968-12-16 | 1968-12-16 | Bleaching of cellulosic pulp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1242709A true GB1242709A (en) | 1971-08-11 |
Family
ID=10484328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB59738/68A Expired GB1242709A (en) | 1968-12-16 | 1968-12-16 | Bleaching of cellulosic pulp |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3619349A (en) |
| FI (1) | FI50644C (en) |
| GB (1) | GB1242709A (en) |
| NO (1) | NO127544B (en) |
| SE (1) | SE365831B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA989112A (en) * | 1972-05-30 | 1976-05-18 | Pulp And Paper Research Institute Of Canada | Bleaching of textiles with chlorine monoxide |
| US3907632A (en) * | 1973-10-23 | 1975-09-23 | Ppg Industries Inc | Bleaching cellulosic pulps with gaseous chlorine at a pH of 7 to 10 in a multistage bleaching process |
| US3990843A (en) * | 1974-08-05 | 1976-11-09 | The Dow Chemical Company | Method for bleaching raw cotton and cotton textiles |
| US20030056295A1 (en) * | 2001-06-06 | 2003-03-27 | Martin Ragnar | Reduction of organically bound chlorine formed in chlorine dioxide bleaching |
| US20050045291A1 (en) * | 2002-08-08 | 2005-03-03 | Martin Ragnar | Reduction of organically bound chlorine formed in chlorine dioxide bleaching |
| AU2012206967A1 (en) * | 2011-01-14 | 2013-05-09 | The Red Triangle, LLC | Compositions and methods for bamboo pulping |
| CN112934205A (en) * | 2021-02-24 | 2021-06-11 | 上海交通大学 | Preparation method and application of porous hydrogel adsorbent based on astragalus waste residues |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2178696A (en) * | 1938-02-03 | 1939-11-07 | Pittsburgh Plate Glass Co | Material treatment |
| US3074842A (en) * | 1959-07-24 | 1963-01-22 | Dorr Oliver Inc | Treatment of unbleached cellulose pulps |
-
1968
- 1968-12-16 GB GB59738/68A patent/GB1242709A/en not_active Expired
-
1969
- 1969-12-08 US US882819A patent/US3619349A/en not_active Expired - Lifetime
- 1969-12-15 FI FI693632A patent/FI50644C/en active
- 1969-12-15 SE SE17239/69A patent/SE365831B/xx unknown
- 1969-12-15 NO NO04945/69A patent/NO127544B/no unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FI50644B (en) | 1976-02-02 |
| FI50644C (en) | 1976-05-10 |
| NO127544B (en) | 1973-07-09 |
| US3619349A (en) | 1971-11-09 |
| SE365831B (en) | 1974-04-01 |
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