Ethanol, lactic acid metal halide catalyzed France

To acetaldehyde and hydrocyanic acid as raw materials, the reaction of ethylene cyanohydrin, and then with ethanol in the presence of inorganic acid esterification.  Ethyl lactate 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 after vacuum distillation, collecting product, yield 74% -79%.  sulfuric acid catalysis. In the sulfuric acid-catalyzed esterification of lactic acid with an excess of ethanol derived ethyl lactate; also be heated in carbon lactic acid powder will flow dehydration 24h, atmospheric distillation recycling excess ethanol and then vacuum distilled products.  the solid acid catalysis. NaY zeolite was washed with water, dried, high temperature burning, and then impregnated with a certain concentration of NH4Cl solution was stirred for ion exchange, the NH4Y filtered, washed, dried, 550 ℃ high temperature activation, ie solid acid HY. Then lactic acid, ethanol, benzene, HY added to the reaction flask, HY / lactic acid (mass ratio) = 25/100, acid / ethanol (molar ratio) = 1/3. Refluxing the reaction under 100-160 ℃ 8-10h, the esterification rate of 60% or more.