Process for precipitation of carboxyalkoxy succinate tetrahydrate salt
US4137260A · kind A · utility
2Cited by
3References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 3, 1977 |
| Grant date | Jan 30, 1979 |
| Priority date | — |
| Expiry date | Feb 3, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C59/305
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
It is disclosed that water soluble carboxyalkoxy succinate tetrahydrate salt can be precipitated in high purity from alcohol-water solvent systems when operating at temperatures from about 50.degree. C to about 100.degree. C using seed crystals of either tetrahydrate or pentahydrate form or a mixture thereof. Useful temperatures are from about 45.degree. to about 75.degree. C. Preferred temperatures are above about 55.degree. C up to about 65.degree. C where tetrahydrate product is obtainable even where pentahydrate seed is used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.