Chemical process
US4904824A · kind A · utility
5Cited by
5References
17Claims
0Family size
Inventors
Key dates
| Filing date | Aug 24, 1988 |
| Grant date | Feb 27, 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 mixtures of alkali metal salts of 1-hydroxy-3-oxa-1,2,4,5-pentane tetracarboxylate and alkali metal salts of 3,6-dioxa-1,2,4,5,7,8-octane hexacarboxylate wherein by-product calcium carbonate produced by the process of making such mixtures is employed in a recycle pattern to prepare additional amounts of mixtures of said compounds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.