Catalytic Synthesis of acetyl salicylic acid With the Solid Superacid SO_4~(2-)/ZrO_2

In the synthesis of acetyl salicylic acid,Salicylic acid and acetic anhydride were used as the reaction raw material,with solid super acid SO_4~(2-)/ZrO_2 as catalyst.The factors such as superacid calcination temperature,reaction temperature,reaction time,molar ratio,and the amount of catalyst influencing the reaction were discussed.The results showed that when the calcination temperature was 650℃,reaction temperature is 80℃,reaction time was 30 min,salicylic acid and acetic anhydride molar ratio was 1:2.0,the quantity of catalyst was 0.8 g,the yield of acetylsalicylic acid reached 82.4%.The catalyst still has a good catalytic activity after six times of recycling.