GB581157A - Improvements in or relating to the production of organic esters of cellulose - Google Patents
Improvements in or relating to the production of organic esters of celluloseInfo
- Publication number
- GB581157A GB581157A GB5288/45A GB528845A GB581157A GB 581157 A GB581157 A GB 581157A GB 5288/45 A GB5288/45 A GB 5288/45A GB 528845 A GB528845 A GB 528845A GB 581157 A GB581157 A GB 581157A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ripening
- acid
- cellulose
- water
- added
- 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
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 acid esters of cellulose are prepared by esterifying cellulose with an organic acid anhydride in the presence of an inorganic acid catalyst, neutralizing part or all of the catalyst before the ripening operation and continuously incorporating water during a substantial part of the ripening operation. The cellulosic material may be cotton, cotton linters, wood pulp or regenerated cellulose or other cellulosic material derived from such sources as grasses, straws and hulls. The cellulose may be pretreated with acetic or formic acid or a mixture of these acids to which a small proportion of sulphuric acid may be added. The acid catalyst is preferably sulphuric acid, but phosphoric acid or a mixture of phosphoric and sulphuric acids may be used. Before ripening, the catalyst is wholly or partly neutralized by the addition of an acetate of magnesium, calcium or zinc, or oxides, carbonates or hydroxides of various metals. The water for ripening is preferably added in the form of dilute acetic acid. Ripening may be carried out at 50-117 DEG C., water being added continuously until at total of 1 to 12 times the weight of the cellulose has been added. Ripening is then continued until the desired acetyl value is obtained. In an example, cotton linters are acetylated with a mixture of acetic anhydride, glacial acetic acid and sulphuric acid for three hours, the peak temperature being 37 DEG C. Excess anhydride is destroyed by the addition of just sufficient water, and part of the sulphuric acid is neutralized by the addition of a neutralizing agent. The solution is maintained at 33 DEG C. for 30 minutes and then at 60 DEG C. for one hour. Ripening is then carried out, water being added continuously for a period of 10 hours. Ripening is continued for a further 16 hours before precipitation of the acetate by the addition of water. The acetate obtained has an acetyl value of 44.3 per cent calculated as acetic acid.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US581157XA | 1944-03-09 | 1944-03-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB581157A true GB581157A (en) | 1946-10-02 |
Family
ID=22014779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5288/45A Expired GB581157A (en) | 1944-03-09 | 1945-03-02 | Improvements in or relating to the production of organic esters of cellulose |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB581157A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5142034A (en) * | 1990-04-16 | 1992-08-25 | Eastman Kodak Company | Cellulose ester compositions and process for the preparation thereof |
| US5597912A (en) * | 1990-04-16 | 1997-01-28 | Eastman Chemical Company | Process for preparing cellulose esters by use of carboxylic acids |
-
1945
- 1945-03-02 GB GB5288/45A patent/GB581157A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5142034A (en) * | 1990-04-16 | 1992-08-25 | Eastman Kodak Company | Cellulose ester compositions and process for the preparation thereof |
| US5597912A (en) * | 1990-04-16 | 1997-01-28 | Eastman Chemical Company | Process for preparing cellulose esters by use of carboxylic acids |
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