Method of producing carboxymethyloxysuccinic acid
US3948985A · kind A · utility
2Cited by
4References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1974 |
| Grant date | Apr 6, 1976 |
| Priority date | — |
| Expiry date | Oct 11, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/367
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Carboxymethyloxysuccinic acid is prepared by acidifying the calcium salt of carboxymethyloxysuccinic acid with sulfuric acid at a temperature of 40.degree.C to 80.degree.C; filtering off the CaSO.sub.4 .2H.sub.2 O by-product and concentrating the filtrate to give the purified acid. The calcium salt of carboxymethoxysuccinic acid is formed by reacting maleic acid and glycolic acid in aqueous media containing excess calcium hydroxide.
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