GB526399A - Improvements in or relating to processes for obtaining cellulose for the manufactureof rayon from resinous pine woods - Google Patents
Improvements in or relating to processes for obtaining cellulose for the manufactureof rayon from resinous pine woodsInfo
- Publication number
- GB526399A GB526399A GB8287/39A GB828739A GB526399A GB 526399 A GB526399 A GB 526399A GB 8287/39 A GB8287/39 A GB 8287/39A GB 828739 A GB828739 A GB 828739A GB 526399 A GB526399 A GB 526399A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cellulose
- per cent
- lye
- pine
- rayon
- 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
- D21C1/00—Pretreatment of the finely-divided materials before digesting
- D21C1/06—Pretreatment of the finely-divided materials before digesting with alkaline reacting compounds
Landscapes
- Paper (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
526,399. Refining cellulosic materials. PALAZZO, F. C. March 15, 1939, No. 8287. Convention date, March 16, 1938. [Class 2 (ii)] Cellulose, particularly for the manufacture of rayon, is obtained from pine woods having a large resin content by subjecting the wood for a period of from 1 to 2 hours and at a temperature of from 90-95‹C. to the action of an alkaline lye, containing from 0.1 to 0.2 per cent. of sodium hydroxide, after which the product is digested in a bisulphite lye. The bisulphite digestion may be carried out at 106-108‹C. with a lye containing 0.5 to 1 per cent. of calcium oxide, and from 5 to 6 per cent. of free and combined sulphur dioxide. Bleaching of the treated cellulose may be carried out in two stages, with a hypochlorite solution which, without being acidified with strong mineral acid, contains about half of the hypochlorous acid in the free state and half as a calcium or sodium salt. A treatment with sodium hydroxide solution may be interposed between the two bleaching treatments. Last traces of hypochlorous acid may be removed by subjecting the cellulose material to treatment with sulphurous acid solution. Wood which may be treated by the process includes that of the red fir or Scotch pine, and the cluster pine or pinaster.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT526399X | 1938-03-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB526399A true GB526399A (en) | 1940-09-17 |
Family
ID=11277364
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8287/39A Expired GB526399A (en) | 1938-03-16 | 1939-03-15 | Improvements in or relating to processes for obtaining cellulose for the manufactureof rayon from resinous pine woods |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR836072A (en) |
GB (1) | GB526399A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3177112A (en) * | 1959-05-12 | 1965-04-06 | Aschaffenburger Zellstoffwerke | Method for pretreating wood for the production of cellulose |
US3177110A (en) * | 1961-07-24 | 1965-04-06 | Aschaffenburger Zellstoffwerke | Process for pretreating wood for the production of cellulose |
US10751732B2 (en) | 2015-06-19 | 2020-08-25 | Kubota Manufacturing Corporation | Bucket for swinging rotor of centrifugal separator |
-
1938
- 1938-04-02 FR FR836072D patent/FR836072A/en not_active Expired
-
1939
- 1939-03-15 GB GB8287/39A patent/GB526399A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3177112A (en) * | 1959-05-12 | 1965-04-06 | Aschaffenburger Zellstoffwerke | Method for pretreating wood for the production of cellulose |
US3177110A (en) * | 1961-07-24 | 1965-04-06 | Aschaffenburger Zellstoffwerke | Process for pretreating wood for the production of cellulose |
US10751732B2 (en) | 2015-06-19 | 2020-08-25 | Kubota Manufacturing Corporation | Bucket for swinging rotor of centrifugal separator |
Also Published As
Publication number | Publication date |
---|---|
FR836072A (en) | 1939-01-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB427626A (en) | Improvements in or relating to the manufacture of cellulose | |
GB501485A (en) | A process for the production of a pure white cellulose product from raw sawdust | |
US3382149A (en) | Bleaching of hardwood sulfite pulp with hydrogen peroxide, including pretreatment with alkali | |
US2697703A (en) | Fractionation of lignocellulose materials | |
US1859847A (en) | Pulped material and process of preparing the same | |
GB526399A (en) | Improvements in or relating to processes for obtaining cellulose for the manufactureof rayon from resinous pine woods | |
US2041745A (en) | Manufacture of cellulosic prod | |
US1880043A (en) | Production of high grade chemical pulps | |
US2407909A (en) | Purification of crude cellulosic material | |
US1842649A (en) | Process of treating cellulose material | |
US2061616A (en) | Production of cellulose | |
GB710257A (en) | Wood pulp | |
US1705897A (en) | Bleaching of pulp | |
US1822125A (en) | Method for the treatment of cellulosic materials | |
US1868570A (en) | Process for treating woody materials to obtain fibers therefrom | |
US1722993A (en) | Production of pulp | |
US1811864A (en) | Process of liberating fiber from bagasse or like stalks | |
GB640543A (en) | Improvements in or relating to the production of cellulose | |
GB269909A (en) | Improvements in or relating to treating residual liquors accruing from the treatment of cellulose material | |
US1780539A (en) | Process of treating fiber of nonconiferous origin | |
US1830461A (en) | Production of pulp, etc. | |
US2932600A (en) | Process for the production of pulp from bagasse | |
GB298333A (en) | Process for obtaining cellulose from ligno-cellulosic material | |
GB734216A (en) | Process for the treatment of ligno-cellulosic fibres | |
US1819003A (en) | Multiple-step process of fiber liberation |