Process for producing dicarboxylic acids

C - Chemistry – Metallurgy – 07 – C

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C07C 51/31 (2006.01) C07B 61/00 (2006.01) C07C 55/14 (2006.01)

Patent

CA 2469926

A process produces a corresponding dicarboxylic acid by subjecting a cycloalkane to an oxidative cleavage reaction with oxygen in the presence of a catalyst in a liquid phase using a continuous reactor, in which a residence time .tau.(hr) satisfies the following condition: 0. 1<=.tau.<=50/c, wherein c is the proportion (% by weight) of the cycloalkane to the total weight of a charged liquid. The catalyst includes, for example, cobalt compounds, manganese compounds, and mixtures of these compounds, as well as imide compounds having at least one cyclic imide skeleton.

La présente invention se rapporte à un procédé de production d'acide dicarboxylique, qui consiste à effectuer le clivage par voie oxydante d'un cycloalcane avec de l'oxygène dans une phase liquide, au moyen d'un réacteur continu en présence d'un catalyseur permettant la production de l'acide dicarboxylique correspondant. Ce procédé se caractérise en ce que le temps de séjour .tau. (hr) est régulé de manière à appartenir à l'intervalle 0, 1 <= .tau. <= 50/c, où c représente la proportion ( % en poids) du cycloalcane par rapport à l'ensemble des liquides introduits. Le catalyseur peut être un composé de cobalt, un composé de manganèse ou un mélange de ces composés. Un composé imide possédant un squelette imide cyclique peut également être utilisé en tant que catalyseur.

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