Process for the preparation of alkyl lactates

Details Process for the preparation of alkyl lactates Process for the preparation of alkyl lactates

C - Chemistry, Metallurgy

07

C

C07C 67/08 (2006.01) C07C 69/68 (2006.01)

Patent

CA 2435994

The present invention relates to a catalyst-free process for the conversion of commercial lactic acid to alkyl ester of carbon C1 to C8 which comprises simultaneous hydrolysis of dimers or highpolymers of lactic acid present in commercial lactic acid to free lactic acid and esterification of free lactic acid with an alcohol in the presence of water at a temperature in the range of 130-250~C for 4 - 11 hrs at a pressure of 5-25 kg/cm2, to obtain desired esters.

La présente invention concerne un procédé exempt de catalyseur destiné à la conversion d'un acide lactique commercial en un ester alkylique de carbone C1 à C8, ledit procédé comprenant l'hydrolyse simultanée de dimères ou de hauts polymères d'acide lactique présents dans l'acide lactique commercial en acide lactique libre, et l'estérification de l'acide lactique libre avec un alcool en présence d'eau à une température comprise entre 130 et 250 ·C, durant 3 à 4 heures, à une pression comprise entre 5 et 25kg/cm2, de manière à obtenir les esters souhaités.

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