The Esterification of Salicylic Acid Catalyzed by Solid Super Acid SO_4~(2-)4-La_2O_3-TiO_2

Solid super acid SO2-4-La2O3-TiO2 is first applied to esterification of Salicylic Acid with methyl alcohol and acetic anbyolride.Reaction conditions are studied.The optimum condition is in the following:molar ratio of Salicylic Acid to methyl alcohol being 1:12,the quantity of catalyst being 40g/mol acid,and the reaction time being 5h,the yield of Methyl Salicylate reaching over 86%;molar ratio of Salicylic Acid to acetic anbyolride being 1:4,the quantity of catalyst being 6g/mol acid,the yield of Aacetyl Salicylic Acid could reaching over 86%.The catalyst could be easily re-cycled at least four times without the obvious loss of catalytic activity.It is an envionmentally friendly catalyst.