Controlled oxidation of hydrocarbons to intermediate...

Details Controlled oxidation of hydrocarbons to intermediate... Controlled oxidation of hydrocarbons to intermediate...

C - Chemistry, Metallurgy

07

C

C07C 51/16 (2006.01) C07C 51/31 (2006.01)

Patent

CA 2331663

This invention relates to methods of controlling the oxidation of hydrocarbons to respective intermediate oxidation products, e.g., dibasic acids, by adjusting the bulk temperature of the liquid mixture under oxidation by a cooling element, the temperature of which is maintained above a temperature at which solids deposit on the element or a second liquid phase is formed on the element, and/or by maintaining the oxygen concentration in the condenser off- gases to a level preferably lower than 90 % by volume of the flammable oxygen concentration, and/or by feeding oxygen and inert gas (preferably nitrogen) in the reaction zone, the inert gas and the oxygen having a ratio of inert gas to oxygen in the range of preferably 1:5 to 1:200. This invention is particularly applicable in the case of direct oxidation of cyclohexane to adipic acid.

L'invention porte sur des procédés régulant l'oxydation d'hydrocarbures en leurs produits d'oxydation intermédiaires respectifs, par exemple des acides dibasiques, en ajustant la température du bain en cours d'oxydation à l'aide d'un élément refroidissant dont la température est maintenue au-dessus du niveau où les solides se déposent sur l'élément, et/ou en maintenant la concentration d'oxygène dans les gaz effluents du condenseur à un niveau de préférence inférieur à 90 % en volume de la concentration en oxygène inflammable, et/ou en fournissant de l'oxygène et un gaz inerte (de préférence de l'azote) à la zone de réaction, le gaz inerte et l'oxygène étant de préférence dans un rapport GI/O allant de 1:5 à 1:200. L'invention s'applique en particulier à l'oxydation directe du cyclohexane en acide adipique.

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