Chemical process
US4959496A · kind A · utility
5Cited by
5References
49Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1988 |
| Grant date | Sep 25, 1990 |
| Priority date | — |
| Expiry date | Aug 24, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/367
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
There is disclosed herein improved processes for the preparation of ether carboxylates by reacting in an alkaline reaction medium the salts of maleic acid and a carboxylic or polycarboxylic acid having a reactive hydroxyl group on a non-carbonyl carbon atom in the presence of a calcium ion catalyst wherein unreacted acid salts are recovered from the reaction medium by lowering the pH of the reaction medium to a range of from about 4 to about 6. The precipitated salts are recycled to the synthesis reaction to prepare additional amounts of product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.