Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters
Patent
1989-12-05
1990-10-02
Lone, Werren B.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid esters
C07C 6702
Patent
active
049609270
ABSTRACT:
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, comprised of 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 The acetate (III) formed is withdrawn from (R) mixed with the catalyst, which is separated and recycled in (R).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).
REFERENCES:
patent: 3700726 (1972-10-01), Johnson, Jr. et al.
patent: 4370491 (1983-01-01), Bott et al.
Canonge Michel
Joly Jean C.
BP Chemicals Limited
Lone Werren B.
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