GB369215A - A process of hydrolysing cellulose acetate - Google Patents
A process of hydrolysing cellulose acetateInfo
- Publication number
- GB369215A GB369215A GB37775/30A GB3777530A GB369215A GB 369215 A GB369215 A GB 369215A GB 37775/30 A GB37775/30 A GB 37775/30A GB 3777530 A GB3777530 A GB 3777530A GB 369215 A GB369215 A GB 369215A
- Authority
- GB
- United Kingdom
- Prior art keywords
- parts
- acid
- hydrolysis
- precipitated
- ethylene chloride
- 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
- C08B3/24—Hydrolysis or ripening
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
Comprises the hydrolysis of fibrous or precipitated cellulose triacetate in presence of a solvent mixture of ethylene dichloride and an organic acid, preferably acetic acid. Ethylene chloride may constitute 75 per cent or more of the solvent mixture, but should be at least 25 per cent of the acetic acid. Hydrolysis is preferably conducted at a temperature of approximately 50 DEG C. for 18-24 hours. Suitable hydrolysing agents comprise alcohol or water and the usual acid or other catalyst. After hydrolysis, the solution is immersed in or preferably extruded into a hot precipitating medium, e.g. water, which is kept at a temperature well above the boiling point of ethylene chloride, whereas the latter is flashed out from the solution and the cellulose acetate is precipitated in a light, fluffy form and can be readily washed and dried. The ethylene chloride is recovered by suitable collecting and condensing means. In an example, 88 parts of fibrous or precipitated cellulose triacetate is dissolved in a bath containing 234 parts glacial acetic acid, 312 parts ethylene chloride, 26 parts water, 23 parts sodium acid sulphate monohydrate, 0,9 parts sulphuric acid, and 2,7 parts phosphoric acid; the solution is kept at 50 DEG C. for 18-22 hours, and the cellulose acetate is then precipitated in hot water. Specifications 337,366, [Class 2 (ii), Cellulose &c.], and 356,012, are referred to. The Specification as open to inspection under Sect. 91 (3) (a) refers also to hydrolysis applied directly to acetylation baths. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US369215XA | 1929-12-14 | 1929-12-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB369215A true GB369215A (en) | 1932-03-15 |
Family
ID=21891411
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB37775/30A Expired GB369215A (en) | 1929-12-14 | 1930-12-15 | A process of hydrolysing cellulose acetate |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB369215A (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
- 1930-12-15 GB GB37775/30A patent/GB369215A/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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