GB620726A - Improvements in the manufacture of organic acid esters of cellulose - Google Patents
Improvements in the manufacture of organic acid esters of celluloseInfo
- Publication number
- GB620726A GB620726A GB32265/46A GB3226546A GB620726A GB 620726 A GB620726 A GB 620726A GB 32265/46 A GB32265/46 A GB 32265/46A GB 3226546 A GB3226546 A GB 3226546A GB 620726 A GB620726 A GB 620726A
- Authority
- GB
- United Kingdom
- Prior art keywords
- solution
- cellulose
- ripened
- strontium
- barium
- 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
Abstract
In the production of cellulose organic acidesters, e.g cellulose acetate, by esterifying cellulose with an organic acid anhydride in the presence of a mineral acid esterification catalyst, e.g. sulphuric or phosphoric acid, and a solvent for the ester, a neutralizing compound of a metal of Group II of the Periodic Table or of aluminium is added to the primary esterification solution in an amount at least equivalent or nearly equivalent to the amount of the acid catalyst, after which the solution is ripened at a temperature of at least 125 DEG C. under pressure. Specified neutralizing agents are the acetates of magnesium, zinc, aluminium, calcium, strontium or barium, the oxides or hydroxides of barium or strontium and magnesium carbonate. Water is added to the primary solution during the ripening operation in one or two stages in which latter case the first addition may be effected by the injection of steam, which also serves to heat the solution to the desired temperature. The ripened ester is finally precipitated from solution by the addition of more water. The process effects the ripening in a relatively short time and produces esters of high stability. Numerous examples are given.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US620726XA | 1945-12-06 | 1945-12-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB620726A true GB620726A (en) | 1949-03-29 |
Family
ID=22040047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB32265/46A Expired GB620726A (en) | 1945-12-06 | 1946-10-30 | Improvements in the manufacture of organic acid esters of cellulose |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB620726A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5820961B1 (en) * | 1971-06-30 | 1983-04-26 | Celanese Corp |
-
1946
- 1946-10-30 GB GB32265/46A patent/GB620726A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5820961B1 (en) * | 1971-06-30 | 1983-04-26 | Celanese Corp |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB912387A (en) | A chemically modified starch and method of producing same | |
| GB464427A (en) | Improvements in preparation of esters | |
| GB620726A (en) | Improvements in the manufacture of organic acid esters of cellulose | |
| GB568051A (en) | Improvements in the production of organic esters of cellulose | |
| US2470192A (en) | Rapid ripening of cellulose esters | |
| GB568098A (en) | Improvements in the production of organic esters of cellulose | |
| GB727441A (en) | Organic acid esters of cellulose | |
| GB630937A (en) | Improvements in the manufacture of esters of cellulose | |
| GB581157A (en) | Improvements in or relating to the production of organic esters of cellulose | |
| GB722594A (en) | Improvements in the manufacture of cellulose esters | |
| GB566863A (en) | Improvements in or relating to the manufacture of cellulose esters | |
| GB681865A (en) | Preparation of cellulose esters | |
| GB674710A (en) | A method of preparing aliphatic acyl hydroxypolycarboxylic acid anhydrides | |
| GB442120A (en) | A process for manufacturing novel cyclic ketones | |
| GB737566A (en) | Improvements in the production of organic acid esters of cellulose | |
| SU67944A1 (en) | Method for producing oil rosin varnishes | |
| GB371586A (en) | An improved process for the manufacture of ester acetates direct from calcium acetate | |
| GB567893A (en) | Improvements in the production of organic esters of cellulose | |
| GB669568A (en) | Improvements in or relating to the preparation of a derivative of cyclohexene | |
| GB597295A (en) | Improvements in the production of organic acid esters of cellulose | |
| GB630388A (en) | Improvements in the production of cellulose esters | |
| GB1000684A (en) | Diol derivative of 9-oxabicyclo(3,3,1)nonane | |
| GB779188A (en) | Manufacture of acids of the trisnorlanostane series and their derivatives | |
| GB676232A (en) | Improvements in and relating to the production of cellulose esters | |
| GB647173A (en) | A process for the manufacture of a benzilic acid derivative |