GB818828A - Process for bleaching cellulosic pulp - Google Patents
Process for bleaching cellulosic pulpInfo
- Publication number
- GB818828A GB818828A GB18374/57A GB1837457A GB818828A GB 818828 A GB818828 A GB 818828A GB 18374/57 A GB18374/57 A GB 18374/57A GB 1837457 A GB1837457 A GB 1837457A GB 818828 A GB818828 A GB 818828A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bleaching
- pulp
- effected
- temperature
- tanks
- 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
- D21C9/1026—Other features in bleaching processes
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
Cellulosic pulp, especially pulp of high density, is admixed with a hypochlorite bleaching solution under such conditions of duration and temperature that no substantial bleaching is caused, whereafter the temperature is immediately raised to effect bleaching and, at the desired degree of brightness, the bleaching is stopped by "drowning" the mass in water. The bleach liquor may be distributed in the pulp at temperatures below 80 DEG F. The heating may be effected by the direct application of steam at temperatures of 140 DEG to 212 DEG F. The bleaching may be effected with sodium or calcium hypochlorite solution containing caustic soda. An apparatus is described and contains storage chests, priming tanks, thickeners, a shredder, a mixing-tank, retention chambers and cold water dilution tanks through which the pulp passes sequentially.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US818828XA | 1956-07-10 | 1956-07-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB818828A true GB818828A (en) | 1959-08-26 |
Family
ID=22167009
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB18374/57A Expired GB818828A (en) | 1956-07-10 | 1957-06-11 | Process for bleaching cellulosic pulp |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE1081299B (en) |
GB (1) | GB818828A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0030158A1 (en) * | 1979-12-03 | 1981-06-10 | The Black Clawson Company | Apparatus and process for medium consistency oxygen delignification of pulp |
FR2546545A1 (en) * | 1983-05-23 | 1984-11-30 | Process Evaluation Devel | Thermal mechanical digestion process employing bleaches |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE380224A (en) * | 1922-03-13 | |||
US1597880A (en) * | 1924-07-14 | 1926-08-31 | William D Gregor | Bleaching process |
US2283141A (en) * | 1939-06-29 | 1942-05-12 | Buffalo Electro Chem Co | Treatment of textile fabrics |
-
1957
- 1957-06-11 GB GB18374/57A patent/GB818828A/en not_active Expired
- 1957-06-20 DE DES53943A patent/DE1081299B/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0030158A1 (en) * | 1979-12-03 | 1981-06-10 | The Black Clawson Company | Apparatus and process for medium consistency oxygen delignification of pulp |
US4363697A (en) | 1979-12-03 | 1982-12-14 | The Black Clawson Company | Method for medium consistency oxygen delignification of pulp |
FR2546545A1 (en) * | 1983-05-23 | 1984-11-30 | Process Evaluation Devel | Thermal mechanical digestion process employing bleaches |
Also Published As
Publication number | Publication date |
---|---|
DE1081299B (en) | 1960-05-05 |
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