Study on Synthesis of Dibutyl Maleate

Dibutyl maleate was prepared from maleic anhydride and n-butyl alcohol in the presence of p-toluene sulphonic acid.The yield of the ester could reach 95.6% under amount of substance ratio of maleic anhydride,n-butyl alcohol and p-toluene sulphonic acid were 1∶4∶0.16,refluxing and water segrating for 70 min.The catalytic activities of p-toluene sulphonic acid,sulfuric acid,Ferric chloride hexahydrate and ammonium ferric sulfate dodecahydrate et al.in synthesis of dibutyl maleate also were comparison.