Acrylonitrile and Calcium lactate 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 decomposition, bottom too thin lactic acid, concentrated by vacuum to obtain the product.
Propionic acid method as raw material, through chlorination, hydrolysis of the crude buffered 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
没有评论:
发表评论