GB471894A - Improvements in the manufacture of mixed esters of cellulose - Google Patents
Improvements in the manufacture of mixed esters of celluloseInfo
- Publication number
- GB471894A GB471894A GB416236A GB416236A GB471894A GB 471894 A GB471894 A GB 471894A GB 416236 A GB416236 A GB 416236A GB 416236 A GB416236 A GB 416236A GB 471894 A GB471894 A GB 471894A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cellulose
- acetic
- crotonic acid
- acid
- treated
- 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
- C08B3/16—Preparation of mixed organic cellulose esters, e.g. cellulose aceto-formate or cellulose aceto-propionate
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
Cellulose is subjected to a pre-treatment process to render it more reactive and is then treated with acetic or propionic anhydride crotonic acid, and a non-solvent of the cellulose ester produced whereby the fibrous state of the cellulose is preserved. The crotonic acid may be added at the esterification stage or carried over in the cellulose from a pre-treatment with crotonic acid. The process may be modified by using a reaction product of crotonic acid and acetic or propionic anhydride as the esterifying agent. The cellulose may be pretreated with crotonic acid, or a mixture of crotonic acid and acetic or propionic anhydride, or the reaction product of crotonic acid and acetic or propionic anhydride denuded of excess of lower anhydride, e.g. by fractional distillation, and the pre-treated cellulose may then be esterified by acetic or propionic acid alone or together with the crotonic reaction product. Carbon tetrachloride, isopropyl ether, or butyl ether, may be used as non-solvent. The cellulose esters produced are soluble in acetone. Their unsaturated radicles may be halogenated. In an example, linters are pre-treated with acetic acid and a little sulphuric acid. After pressing off, the treated linters are immersed in a mixture of crotonic acid, acetic anhydride and carbon tetrachloride. The temperature is slowly raised from below 15 to 35 DEG C. and then to 50 DEG C. The fibrous ester produced is washed with carbon tetrachloride and then steamed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB416236A GB471894A (en) | 1936-02-11 | 1936-02-11 | Improvements in the manufacture of mixed esters of cellulose |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB416236A GB471894A (en) | 1936-02-11 | 1936-02-11 | Improvements in the manufacture of mixed esters of cellulose |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB471894A true GB471894A (en) | 1937-09-13 |
Family
ID=9771880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB416236A Expired GB471894A (en) | 1936-02-11 | 1936-02-11 | Improvements in the manufacture of mixed esters of cellulose |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB471894A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2453275A (en) * | 1945-03-30 | 1948-11-09 | Celanese Corp | Preparation of mixed saturatedunsaturated esters of cellulose |
| US2552820A (en) * | 1948-10-13 | 1951-05-15 | Celanese Corp | Cellulose esters |
-
1936
- 1936-02-11 GB GB416236A patent/GB471894A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2453275A (en) * | 1945-03-30 | 1948-11-09 | Celanese Corp | Preparation of mixed saturatedunsaturated esters of cellulose |
| US2552820A (en) * | 1948-10-13 | 1951-05-15 | Celanese Corp | Cellulose esters |
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