GB754782A - Improvements in the bleaching of cellulose pulps - Google Patents
Improvements in the bleaching of cellulose pulpsInfo
- Publication number
- GB754782A GB754782A GB18679/54A GB1867954A GB754782A GB 754782 A GB754782 A GB 754782A GB 18679/54 A GB18679/54 A GB 18679/54A GB 1867954 A GB1867954 A GB 1867954A GB 754782 A GB754782 A GB 754782A
- Authority
- GB
- United Kingdom
- Prior art keywords
- hypochlorite
- chlorite
- per cent
- treatments
- boiled
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
Cellulosic pulps, e.g. wood pulps are boiled with a dilute alkali solution at a temperature of at least 125 DEG C. and are subsequently treated with a mixture of a chlorite and a hypochlorite in proportions such that the amount of available chlorine derived from the hypochlorite is from one half to twice that derived from the chlorite. The pulp may be boiled as a slurry of consistency 5 to 20 per cent by weight with sodium hydroxide of concentration 0.4 to 6 per cent and may be bleached as a slurry of 2 to 18 per cent by weight consistency, at temperatures between 10 DEG C. and 60 DEG C. and pH between 7 and 10, which may be adjusted with sodium hydroxide. Sodium chlorite and hypochlorite may be used. Boiling temperatures up to 170 DEG C. are specified. Either the boiling or the bleaching treatment may be preceded by other alkali treatments or treatments with chlorine and/or hypochlorite, and the process may be followed by other purification treatments. The example relates to the treatment of sulphite pulp.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US754782XA | 1953-06-25 | 1953-06-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB754782A true GB754782A (en) | 1956-08-15 |
Family
ID=22126022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB18679/54A Expired GB754782A (en) | 1953-06-25 | 1954-06-25 | Improvements in the bleaching of cellulose pulps |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB754782A (en) |
-
1954
- 1954-06-25 GB GB18679/54A patent/GB754782A/en not_active Expired
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