FORFARANDE FOR FRAMSTELLNING AV KARBOXIMETYLOXIBERNSTENSYRA

摘要

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 CaSO4?2H2O by-product and concentrating the filtrate to give the purified acid. The calcium salt of carboxymethyloxysuccinic acid is formed by reacting maleic acid and glycolic acid in aqueous media containing excess calcium hydroxide.