Process for the continuous preparation of acetates

Details Process for the continuous preparation of acetates Process for the continuous preparation of acetates

C - Chemistry, Metallurgy

07

C

202/58, 260/494.

C07C 67/02 (2006.01) C07C 67/03 (2006.01) C07C 69/14 (2006.01)

Patent

CA 1305719

ABSTRACT OF THE DISCLOSURE PROCESS FOR THE CONTINUOUS PREPARATION OF ACETATES The invention relates to a process for the continuous preparation of acetates by a transesterification reaction in the homogeneous liquid phase in the presence of a catalyst selected from metallic alcoholates. The process comprises more particularly the introduction of the catalyst into a reactor (R) and the introduction of the reagents, formed by an acetate (I) and an alcohol (II), into a distillation column (D1) surmounting the reactor (R) and operating at a pressure (P1) identical with that in (R). The acetate (III) formed is withdrawn from (R) mixed with the catalyst, which is separated and recycled in (R). An azeotropic mixture (M1), comprising the acetate (I) and the alcohol (IV) formed, emergences at the head of (D1) and feeds a distillation column (D2) at a pressure (P2) lower than (P1), so as to produce at the head of the column an azeotropic mixture (M2) depleted in alcohol (IV), the mixture being recycled in (D1). The process permits the use of relatively humid reagents and alcohols of low reactivity, more particularly secondary alcohols (Fig 1).

559415

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