Process for preparing lactate

Details Process for preparing lactate Process for preparing lactate

C - Chemistry, Metallurgy

07

C

C07C 67/20 (2006.01) C07C 69/68 (2006.01)

Patent

CA 2142581

A process for preparing a lactate is herein dis- closed which comprises (1) a step of preparing lactonitrile from prussic acid and acetaldehyde, (2) a step of hydrating lactonitrile to form lactamide, (3) a step of forming the desired lactate and formamide from lactamide and a formate (or methanol and carbon monoxide), and (4) a step of dehy- drating formamide in the step (3) to form prussic acid and recycling the same through the step (1). Heretofore, the lactate has been manufactured by forming lactonitrile (cyanohydrin) from acetaldehyde and prussic acid, and then esterifying lactonitrile with a mineral acid or the like, but in this conventional tech- nique, ammonium salts are formed as by-products in an amount equal to that of the lactate. According to the present invention, the lactate can efficiently be manufac- tured on an industrial scale without forming a large amount of the ammonium salts as the by-products.

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