Preparation of diethyl maleate by reaction distillation coupled with solid acid resin
Diethyl maleate was synthesized using maleic anhydride and anhydrous ethanol under the catalysis of DA330 solid resinous acid.The reaction factors,process parameters and the stability of catalyst were studied.The results showed that under the conditions of ethanol and maleic anhydride molar ratio was 8∶1,reaction temperature was 100℃,space velocity of raw materials was 0.8～1h-1,the maleic anhydride conversion was greater than 99.5％,and the catalyst could be used stably for a long time to meet the needs of industrialization.
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