Process for continuously preparing unsaturated carboxylic...

C - Chemistry – Metallurgy – 07 – C

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C07C 57/04 (2006.01)

Patent

CA 2655820

The invention relates to a method for the continuous production of unsaturated carboxylic acid anhydrides of formula (I) R-C(O)-O-C(O)-R (I), wherein R is an unsaturated organic group with 2 to 12 C atoms, by transanhydrization of an aliphatic carboxylic acid anhydride with a carboxylic acid of formula (II) R-COOH (II), wherein R is defined as above, in a rectification column having an upper, a middle and a lower zone. The method is characterized in that f) an inert boiling oil is present in the sump of the column, g) the feed-stock is fed to a reaction zone in stoichiometric ratios, h) the carboxylic acid formed as a by-product is removed at the top of the column, i) the non-reacted feed-stock is returned to the reaction zone, and j) the product of formula (I) is obtained via a lateral outlet, preferably between the middle and the lower column zone.

L'invention concerne un procédé de production en continu d'anhydrides d'acides carboxyliques insaturés de formule générale (I) R-C(O)-O-C(O)-R, dans laquelle R représente un radical organique insaturé comportant 2 à 12 atomes de carbone, par transanhydrisation d'un anhydride d'acide carboxylique aliphatique avec un acide carboxylique insaturé de formule générale (II) R-COOH, dans laquelle R possède la signification indiquée ci-dessus, dans une colonne de rectification pourvue d'une zone supérieure, d'une zone centrale et d'une zone inférieure. L'invention se caractérise en ce que f) une huile inerte à point d'ébullition est présente dans le bas de ladite colonne; g) les éduits sont injectés dans une zone de réaction dans des rapports stoechiométriques; h) l'acide carboxylique obtenu comme sous-produit est prélevé en tête de colonne; i) les éduits n'ayant pas réagi sont ramenés à la zone de réaction et j) le produit de formule (I) est recueilli en un point de soutirage latéral situé de préférence entre les zones centrale et inférieure de la colonne.

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