Methods of recycling catalyst in oxidations of hydrocarbons

Details Methods of recycling catalyst in oxidations of hydrocarbons Methods of recycling catalyst in oxidations of hydrocarbons

C - Chemistry, Metallurgy

07

C

C07C 51/31 (2006.01) B01D 3/00 (2006.01) B01D 3/14 (2006.01) B01D 3/34 (2006.01) B01J 10/00 (2006.01) B01J 19/00 (2006.01) C07C 51/21 (2006.01) C07C 51/215 (2006.01) C07C 51/265 (2006.01) C07C 51/42 (2006.01)

Patent

CA 2304121

This invention relates to methods of recycling catalyst in oxidations of hydrocarbons, such as cyclohexane for example, to respective intermediate oxidation products, such as adipic acid for example, by a direct process. The catalyst remains in solution despite removal of water from the composition, since the water removal is controlled at such temperatures and such remaining water levels that prevent catalyst from precipitating. The water removal is preferably conducted before removal of the intermediate oxidation product. Also, preferably, some, and more preferably all steps of the process are conducted in a single liquid phase region.

Cette invention concerne des procédés de recyclage de catalyseur au cours d'oxydations d'hydrocarbures, tels que le cyclohexane par exemple. Ces procédés sont mis en oeuvre en vue de produire des produits d'oxydation intermédiaires respectifs, tels que de l'acide adipique par exemple, et ce, par processus direct. Le catalyseur reste en solution malgré l'extraction de l'eau contenue dans la composition, puisque l'extraction de l'eau est régulée à des températures et des niveaux d'eau restante qui empêchent le catalyseur de précipiter. L'extraction de l'eau est effectuée de préférence avant l'extraction du produit d'oxydation intermédiaire. Ainsi, certaines, et de préférence, toutes les étapes de ce procédé, sont réalisées dans une seule zone à phase liquide.

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