Process for purification of alkyl alkanoate

C - Chemistry – Metallurgy – 07 – C

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C07C 69/14 (2006.01) C07C 67/40 (2006.01) C07C 67/54 (2006.01) C07C 67/60 (2006.01)

Patent

CA 2345983

A process is described for the recovery of substantially pure alkyl alkanoate, such as ethyl acetate from an impure feedstock. The impure feedstock is contacted with a selective hydrogenation catalyst in the presence of hydrogen in a selective hydrogenation zone maintained under selective hydrogenation conditions effective for selective hydrogenation of impurities containing reactive carbonyl groups thereby to hydrogenate said impurities to the corresponding alcohols. After recovery from the selective hydrogenation zone of a selectively hydrogenated reaction product mixture comprising said alkyl alkanoate and said corresponding alcohols, this is distilled in one or more distillation zones so as to produce substantially pure alkyl alkanoate therefrom which is recovered.

La présente invention concerne un procédé permettant de récupérer un alkyle-alcanoate et notamment un éthylacétate à partir d'une charge initiale sensiblement impure. Le procédé consiste à prendre cette charge initiale impure et à la mettre en contact avec un catalyseur d'hydrogénation sélective en présence d'hydrogène dans une zone d'hydrogénation sélective maintenue dans des conditions d'hydrogénation sélective permettant l'hydrogénation sélective d'impuretés contenant des groupes carbonyle réactifs, de façon à obtenir par hydrogénation les alcools correspondants. Après récupération, dans la zone d'hydrogénation sélective, d'un mélange de produits de réaction sélectivement hydrogénés comprenant l'alkyle-alcanoate considéré et les alcools correspondants, on prend le mélange et on le distille dans au moins une zone de distillation de façon à produire à partir de ce mélange l'alkyle-alcanoate sensiblement pur et de le récupérer.

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