Synthesis of Dioctyl Meleate by Solid Super Acid SO_4~(2-)/TiO_2 Catalyst

Solid super acid catalyst SO42- TiO2 was prepared and used in synthesizing dioctyl maleate by comparing with sulfuric acid and p - toluene sulfonic acid. The effects of sulfuric acid concentration, immersing time and the temperature and time of baking on catalytic activity and the reaction time on esterification were studied. The results showed that the solid super acid catalyst SO42-/TiO2 had splendid catalytic activity for the synthesis of dioctyl maleate, immersing 18 hours in 0.5 mol/L sulfuric acid solution and baking 2 hours at 550℃ with the yield of dioctyl maleate over 97.8% .