Method for gas phase catalytic oxidation reaction of a...

C - Chemistry – Metallurgy – 07 – C

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C07C 255/08 (2006.01) C07C 253/24 (2006.01) C07C 253/26 (2006.01)

Patent

CA 2296675

A method for a gas phase catalytic oxidation of an alkane having 3 to 8 carbon atoms and/or an alkene having 2 to 8 carbon atoms in the presence of a composite metal oxide catalyst, characterized by conducting the reaction in the presence of particles substantially inert to the reaction; in particular, a method for preparing an .alpha.,.beta.-unsaturated nitrile by a gas phase catalytic oxidation in the presence of ammonia; and also a method for reutilizing the inert particles after the completion of the reaction by withdrawing the inert particles in the form of a mixture thereof with the catalyst, followed by separation and recovery of the inert particles from the mixture. The method serves to effectively regulate the quantity of heat generated during the reaction and the reaction temperature, efficiently prepare unsaturated nitriles and unsaturated carboxylic acids, and reutilize the inert particles.

Cette invention se rapporte à un procédé d'oxydation catalytique en phase gazeuse d'un alcane ayant de 3 à 8 atomes de carbone et/ou d'un alcène ayant de 2 à 8 atomes de carbone, en présence d'un catalyseur à base d'oxyde métallique composite. Ledit procédé consiste à effectuer la réaction en présence de particules sensiblement inertes vis à vis de cette réaction. L'invention se rapporte en particulier à un procédé de préparation d'un .alpha.,.beta.-nitrile insaturé consistant en une oxydation catalytique en phase gazeuse en présence d'ammoniac, ainsi qu'à un procédé permettant de réutiliser les particules inertes après l'achèvement de la réaction et consistant à retirer ces particules inertes sous forme de mélange avec le catalyseur, puis à séparer et à récupérer les particules inertes à partir dudit mélange. Ce procédé permet de réguler efficacement la quantité de chaleur générée au cours de la réaction ainsi que la température de réaction, de même qu'il permet de préparer efficacement des nitriles insaturés et des acides carboxyliques insaturés, et de réutiliser les particules inertes.

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