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Several imidazolium ionic liquid(IL)-supported sulfonic acids with different anions,[C_3SO_3Hmim]HSO_4,[C_3SO_3Hmim]BF_4, [C_3SO_3 Hmim]PF_6,and[C_3SO_3Hmim]CF_3SO_3,were synthesized and applied as catalysts for esterification reaction of benzoic acid. The experimental results indicate that imidazolium IL-supported sulfonic acid containing anion of HSO_4~- shows the best catalytic activity.Only when less[C_3SO_3Hmim]HSO_4(0.3 equiv.) applied,was the product obtained with high yield of 97%.Furthermore, the produced esters could be separated by decantation,and the catalyst could be reused after the removal of water.
Several imidazolium ionic liquid (IL) -supported sulfonic acids with different anions, [C_3SO_3Hmim] HSO_4, [C_3SO_3Hmim] BF_4, [C_3SO_3Hmim] PF_6, and [C_3SO_3Hmim] CF_3SO_3, were synthesized and applied as catalysts for esterification reaction of benzoic acid. The experimental results indicate that imidazolium IL-supported sulfonic acid containing an anion of HSO_4 ~ - shows the best catalytic activity. On less when [C_3SO_3Hmim] HSO_4 (0.3 equiv.) Applied, was the product obtained with a high yield of 97% the produced esters could be separated by decantation, and the catalyst could be reused after the removal of water.