GB446949A - Improvements in or relating to the production of esters of cellulose - Google Patents
Improvements in or relating to the production of esters of celluloseInfo
- Publication number
- GB446949A GB446949A GB26402/35A GB2640235A GB446949A GB 446949 A GB446949 A GB 446949A GB 26402/35 A GB26402/35 A GB 26402/35A GB 2640235 A GB2640235 A GB 2640235A GB 446949 A GB446949 A GB 446949A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cellulose
- acid
- catalyst
- esterification
- acetic
- 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
- C08B3/02—Catalysts used for the esterification
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
Stable organic esters of cellulose are obtained by acting on cellulose with an esterification medium containing the appropriate anhydride, the corresponding acid in amount at least sufficient to dissolve all the cellulose ester produced, less than 10 per cent of sulphur-containing catalyst, based on the weight of cellulose, and as catalyst aid at least 2 per cent of a hydrogen halide. The catalyst may be sulphuric acid and the catalyst aid may be hydrochloric acid, or zinc, aluminium, or sodium halides together with hydrogen halide. The cellulose esters may be ripened in the presence of hydrochloric acid, aluminium, tin, or zinc chlorides. The esterification solutions may be used directly for the production of articles or the ester may be precipitated with water and redissolved. In an example, cotton linters are pretreated with acetic anhydride, glacial acetic acid, zinc chloride, and a very small proportion of sulphuric acid. The mixture is added to a further quantity of acetic anhydride, acetic acid, and sulphuric acid. The temperature is regulated by cooling means, and aqueous hydrochloric acid is added during esterification. Water is added and the solution is subjected to ripening for several days. The viscosity of the product may be reduced by raising the temperature of esterification. The products may be used for the production of artificial filaments or lacquers. Specification 446,723 is referred to. The Specification as open to inspection under Sect. 91 comprises also the use of other halogen-containing acids or salts of such acids as catalyst aids. In an example, cellulose is pretreated with acetic anhydride, acetic acid, and sulphuric acid, and then esterified after adding further quantities of acetic anhydride, acetic acid, sulphuric acid, and aluminium chloride. The solution is ripened after the addition of dilute hydrochloric acid. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US446949XA | 1934-09-29 | 1934-09-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB446949A true GB446949A (en) | 1936-05-08 |
Family
ID=21933809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB26402/35A Expired GB446949A (en) | 1934-09-29 | 1935-09-24 | Improvements in or relating to the production of esters of cellulose |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB446949A (en) |
-
1935
- 1935-09-24 GB GB26402/35A patent/GB446949A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB446949A (en) | Improvements in or relating to the production of esters of cellulose | |
| US2543191A (en) | Manufacture of organic esters of cellulose | |
| GB487020A (en) | Improvements in or relating to the manufacture of esters of polysaccharides | |
| US2013830A (en) | Hydrolysis of the organic acid esters of cellulose | |
| GB455344A (en) | Improvements in or relating to the production of esters of celluose | |
| US2539586A (en) | Preparation of cellulose esters | |
| GB449066A (en) | Improvements in method of making organic esters of cellulose | |
| GB458596A (en) | Improvements in the manufacture of cellulose derivatives and products obtained therefrom | |
| GB574106A (en) | Improvements in or relating to the production of organic acid esters of cellulose | |
| US2177667A (en) | Method of maintaining the viscosity of cellulose esters uniform | |
| GB531014A (en) | Improvements in or relating to the manufacture of cellulose derivatives | |
| GB467160A (en) | Improvement in high viscosity organic esters of cellulose and process of preparing them | |
| GB399508A (en) | Improvements in cellulosic materials | |
| GB481845A (en) | Treatment of cellulose esters | |
| GB447531A (en) | Improvements in or relating to the manufacture of cellulose esters | |
| GB539804A (en) | Improvements in or relating to cellulose derivatives | |
| GB398192A (en) | Improvements in the manufacture of cellulose derivatives and products obtained therefrom | |
| US1652024A (en) | Process for the manufacture of cellulose acetate | |
| GB447530A (en) | Improvements in or relating to the production of cellulose esters | |
| GB446723A (en) | Improvements in the manufacture of esters of cellulose | |
| US2518706A (en) | Cellulose esters of sulfamic acids | |
| US2801240A (en) | Hydrolysis of cellulose isobutyrate | |
| GB538959A (en) | Improvements in the production of cellulose esters | |
| GB350310A (en) | An improvement in the manufacture of cellulose acetate | |
| GB181900A (en) | Improvements in, or connected with, the manufacture of threads, filaments, strips, or films, of cellulose |