Catalytic synthesis of ethyl lactate with SO_4~(2-)/TiO_2-SnO_2/La~(3+)

The solid superacid SO_4~(2-)/TiO_2-SnO_2/La~~(3+) was prepared,and the optimum synthesis conditions were obtained:concentration of La~~(3+) was 0.1 mol/L and that of H_2SO_4-1.0 mol/L,immersing time-24 h,baking time-1.5 h at 450 ℃.The catalyst was used to synthesize ethyl lactate.The results showed that the appropriate conditions were as follows:the mass of catalyst was 1.5% (based on mass of lactic acid),ratio of n (ethanol) to n (lactic acid) -1.5∶1.0,reaction time-11 h.The yield of ethyl lactate was about 47.56%.