PROCESS FOR PRODUCING cis-EPOXYSUCCINIC ACID SALT.

摘要

A process for producing highly pure cis-epoxysuccinic acid salt in a high yield while suppressing the amount of DL-tartaric acid salt as a by-product by epoxidizing maleic acid salt with hydrogen peroxide in the presence of an epoxidation catalyst, wherein the epoxidation is conducted in an aqueous solution containing a water-soluble alcohol in an amount of 30-90 vol. %. It is possible to recycle the mother liquor freed of the formed cis-epoxysuccinic acid salt to the reaction system. The obtained succinic acid salt is useful as a polymer resin additive, a detergent builder (surfactant), and an intermediate for producing tartaric acid.