Catalyst Synthesis of Diethyl Fumarate by Sodium Acid Sulfate

Diethyl fumarate was synthesized with fumaric and alcohol as raw materials and sodium acid sulfate as catalyst. The optimum esterification conditions were that the reaction temperature was 130℃, molar ratio of alcohol to fumaric acid was 4, the reaction time was 6 h, and the amount of sodium acid sulfate was 5% by weight of fumaric acid. The yield was 93.5%. The method has the advantage of easy operation, good yield, and the catalyst could be reused.