Catalytic Synthesis of Ethyl Lactate

 Lactic acid and ethanol in the presence of sulfuric acid esterification.
 To acetaldehyde and hydrocyanic acid as raw materials, the reaction of ethylene cyanohydrin, and then with ethanol in the presence of inorganic acid esterification.
 metal halide catalyzed method. Instead of concentrated sulfuric acid with a metal halide Synthesis of ethyl lactate, the yield of 65% -71%.
 rare earth compounds catalyzed. Ethanol 0.22-0.33mol, lactic 0.11mol, and a rare earth compound with 25mL agent (molar ratio of the acid 1:100) was added to the flask, a reflux reaction 2.5-3h, the reaction solution was evaporated to an excess of ethanol with liquid, and The unreacted lactic acid powder vacuum distillation, collecting product, yield 74% -79%.