Lactate synthesis

Synthesis method of potassium lactate lactic lactonitrile, acrylonitrile method, acid method, acrylic method, etc., for industrial production lactonitrile only method (also called acetaldehyde hydrocyanic acid method) and the nitrile method.
(1) Method lactonitrile
Lactonitrile method is the acetaldehyde and hydrogen cyanide cold milk continuously fed to the reactor to generate a nitrile (or directly with the milk as raw material nitrile), with a pump into the milk nitrile hydrolysis reactor, into sulfuric acid and water to make milk nitrilase to give the crude acid. And then give it away crude lactic acid esterification reactor, adding ethanol esterification, distillation, concentration, lactic acid decomposition was fine. American Sterling Chemical Company and Japan Musashino Chemical companies are adopting this synthesis of lactic acid.
(2) acrylonitrile Method
Acrylonitrile and acrylonitrile method is hydrolyzed in sulfuric acid fed to the reactor, and then hydrolysis reactor anyone to esterification reaction with methanol; then after separation of the hydrogen sulfate, the crude ester distillation column, the bottom is Fine ester; then refined into a second distillation column ester, thermal Sodium lactate, bottom too thin lactic acid, concentrated by vacuum to obtain the product.
(3) propionic acid method
Propionic acid method as raw material, through chlorination, hydrolysis of the crude lactic acid; re-esterification, distillation, hydrolysis products. This method is more expensive raw materials, only a few companies such as Japan's road contest manufacturers to adopt. Reaction is as follows:
CH3CH2COOH Cl2 one → CH3CHClCOOH NaOH-→ CH3CH (OH) COOH NaCl