GB782903A - Improvements in the manufacture of cellulose esters - Google Patents
Improvements in the manufacture of cellulose estersInfo
- Publication number
- GB782903A GB782903A GB2320254A GB2320254A GB782903A GB 782903 A GB782903 A GB 782903A GB 2320254 A GB2320254 A GB 2320254A GB 2320254 A GB2320254 A GB 2320254A GB 782903 A GB782903 A GB 782903A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- acid
- nitric
- degree
- acetyl
- 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
Cellulose esters of organic acids having a degree of substitution of 2.25-2.6 are subjected in solid particulate form to the hydrolysing action of an aqueous solution of an acid having a degree of ionization of at least 0.1 measured in normal solution at 18 DEG C. until their degree of substitution has been reduced to 0.8-1.9. The acid may be sulphuric, hydrochloric or nitric, preferably nitric. The concentration of the acid preferably does not exceed about 12 per cent and may with advantage be about 1-10 per cent. The acid temperature may be 15-75 DEG C. In an example, a cellulose acetate of acetyl value 53.9 per cent (as acetic acid), dried and ground to pass a 30-mesh B.S.S. screen, is immersed in about 8 times its weight of a 7.5 per cent (by weight) solution of nitric acid at 25 DEG C. for 16 hours, the nitric acid run off and the cellulose acetate washed. It has an acetyl value of 46.3 per cent. If the ripening period is increased by 8 hours the acetyl value is reduced to 40.8 per cent. By using higher temperatures and longer ripening periods acetyl values as low as 27 may be obtained. The products are soluble in acetone-water mixtures, can be moulded, and are more stable than the original cellulose acetates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2320254A GB782903A (en) | 1954-08-10 | 1954-08-10 | Improvements in the manufacture of cellulose esters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2320254A GB782903A (en) | 1954-08-10 | 1954-08-10 | Improvements in the manufacture of cellulose esters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB782903A true GB782903A (en) | 1957-09-18 |
Family
ID=10191805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2320254A Expired GB782903A (en) | 1954-08-10 | 1954-08-10 | Improvements in the manufacture of cellulose esters |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB782903A (en) |
-
1954
- 1954-08-10 GB GB2320254A patent/GB782903A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB968906A (en) | Reconstituted tobacco products and a method for their manufacture | |
| GB937977A (en) | Improvements in partial acetylation of cellulose | |
| GB782903A (en) | Improvements in the manufacture of cellulose esters | |
| GB1153560A (en) | Improved Cellulose Triacetate and process for its production | |
| NL6409641A (en) | ||
| GB889676A (en) | Water insoluble films | |
| ES397473A1 (en) | Process for preparing a dry semi-permeable cellulose acetate membrane | |
| Sakurada et al. | PREPARATION OF ACETATE RAYON BY THE ACETYLATION OF VISCOSE RAYON WITH ACETIC ANHYDRIDE VAPOR (XIII) ACETYLATION WITH ACID CATALYZERS OTHER THAN SULPHURIC ACID | |
| GB1071354A (en) | Improvements in and relating to the manufacture of water-soluble macromolecular compounds containing hydroxyl groups | |
| SU373275A1 (en) | METHOD FOR STABILIZATION OF PULSES AIRS | |
| SU480554A1 (en) | Wood modification method | |
| DE862884C (en) | Process for the production of cellulose esters | |
| GB386855A (en) | Improvements in or relating to the production of sound records | |
| GB319691A (en) | Improvements in the production or treatment of cellulose derivatives | |
| GB313091A (en) | A process for reducing the viscosity of cellulose derivatives | |
| GB281927A (en) | Manufactures of esters of the cellulose series | |
| GB282789A (en) | Process of manufacturing cellulose esters | |
| SE418180B (en) | PROCEDURE FOR PREPARING ESTARS OF FURFURYL ALCOHOL OR DERIVATIVES THEREOF WITH LOWER ALIFATIC CARBOXYL ACID | |
| GB1019569A (en) | Esters of 1ª‡,2ª‡-methylene-í¸-androstene-3,17ª‰-diol and a process for their manufacture | |
| GB637267A (en) | Improvements in the manufacture of organic esters of cellulose | |
| GB726900A (en) | Improvements in the manufacture of cellulose ester filamentary materials | |
| GB840319A (en) | Cellulose esters | |
| GB780281A (en) | Preparation of 5-nitro-2-furaldehyde semicarbazone | |
| GB350310A (en) | An improvement in the manufacture of cellulose acetate | |
| GB861453A (en) | Preparation of spinning solutions of cellulose triacetate |