Synthesis of Dioctyl Meleate by Solid Super Acid SO_4~(2-)/TiO_2/La~(3+) Catalyst.

Solid super acid catalyst SO 2- 4/TiO 2/La 3+ was prepared and used in synthesizing dioctyl maleate, in comparison with sulfur acid and p-toluene sulfonic acid. The effects of prepared conditions such as the sulfur acid concentration, the temperature and time of bakring on catalytic activity and reaction time on esterifi-calion. The results shew that the catalyst had splendid catalytic activity for the synthesis of dioctyl maleale, immersing 10 hours in 1.8 mol/L. sulfur acid solution, baking 3 hours at 550℃, the yield of dioctyl meleate was over 96.9%.