GB355144A - Manufacture of esters of derivatives of cellulose or other carbohydrates - Google Patents
Manufacture of esters of derivatives of cellulose or other carbohydratesInfo
- Publication number
- GB355144A GB355144A GB35594/30A GB3559430A GB355144A GB 355144 A GB355144 A GB 355144A GB 35594/30 A GB35594/30 A GB 35594/30A GB 3559430 A GB3559430 A GB 3559430A GB 355144 A GB355144 A GB 355144A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cellulose
- sulphur dioxide
- acid
- liquid sulphur
- esterified
- 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
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
Organic derivatives of cellulose, of cellulose transformation products or of other carbohydrates are esterified by treatment with a free carboxylic acid or mixture of such acids in the presence of liquid sulphur dioxide. As condensing agents, the known substances may be used; sulphuric acid may be produced by a limited oxidation of the sulphur dioxide. The velocity of the reaction may be increased by increasing the pressure due to the use of sulphur dioxide by the addition of an inert gas or of compressed air. In examples, (I) diethyl cellulose is esterified in the presence of liquid sulphur dioxide by means of formic acid, (2) a cellulose aceto-butyrate is obtained from a partially acetylate cellulose and butyric acid in the presence of liquid sulphur dioxide and of sulphuric acid as catalyst, (3) methyl cellulose is swollen in liquid sulphur dioxide and esterified by acetic acid in the presence of chromic anhydride, the pressure being raised by the addition of nitrogen, (4) hydroxypropyl starch is stirred with liquid sulphur dioxide, zinc chloride and acetic acid. The esters and etheresters of cellulose may be worked up into threads or films by the processes of Specifications 348,931 and 348,959.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE355144X | 1929-11-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB355144A true GB355144A (en) | 1931-08-20 |
Family
ID=6289884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB35594/30A Expired GB355144A (en) | 1929-11-26 | 1930-11-26 | Manufacture of esters of derivatives of cellulose or other carbohydrates |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB355144A (en) |
-
1930
- 1930-11-26 GB GB35594/30A patent/GB355144A/en not_active Expired
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