GB358980A - Process for working up crude cellulose ester solutions - Google Patents
Process for working up crude cellulose ester solutionsInfo
- Publication number
- GB358980A GB358980A GB2152930A GB2152930A GB358980A GB 358980 A GB358980 A GB 358980A GB 2152930 A GB2152930 A GB 2152930A GB 2152930 A GB2152930 A GB 2152930A GB 358980 A GB358980 A GB 358980A
- Authority
- GB
- United Kingdom
- Prior art keywords
- water
- cellulose
- forced
- crude
- reaction mixture
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B3/00—Preparation of cellulose esters of organic acids
- C08B3/22—Post-esterification treatments, including purification
- C08B3/26—Isolation of the cellulose ester
- C08B3/28—Isolation of the cellulose ester by precipitation
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Abstract
Crude solutions of fatty acid esters of cellulose obtained by the acylation of cellulose in the presence of solvents insoluble in water, for example chlorinated hydrocarbons, are worked up by firstly partially deacidifying the crude solution as by extraction with small amounts of water, and then forcing into water while maintaining a large surface of contact, the temperature of the water lying above the boiling point of the azeotropic mixture of solvent, water, and acid. The crude solution may itself be heated during precipitation, which may take place under reduced pressure. In examples, (1) a reaction mixture of cellulose acetate prepared in the presence of ethylene chloride is extracted twice with water so that the residue contains only 30-50 per cent of the original acetic acid and is forced through a sieve into water at 85 DEG C. The cellulose ester is precipitated in a flaky, porous form. (2) A reaction mixture of cellulose acetobutyrate containing methylene chloride is extracted as above and forced into water at 50 DEG C. Specification 337,366, [Class 2 (ii), Cellulose &c.], is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2152930A GB358980A (en) | 1930-07-16 | 1930-07-16 | Process for working up crude cellulose ester solutions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2152930A GB358980A (en) | 1930-07-16 | 1930-07-16 | Process for working up crude cellulose ester solutions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB358980A true GB358980A (en) | 1931-10-16 |
Family
ID=10164440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2152930A Expired GB358980A (en) | 1930-07-16 | 1930-07-16 | Process for working up crude cellulose ester solutions |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB358980A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2775529A (en) * | 1951-03-28 | 1956-12-25 | British Celanese | Manufacture and use of cellulose esters |
-
1930
- 1930-07-16 GB GB2152930A patent/GB358980A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2775529A (en) * | 1951-03-28 | 1956-12-25 | British Celanese | Manufacture and use of cellulose esters |
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