Epoxidation reactions and operating conditions thereof

C - Chemistry – Metallurgy – 07 – D

Patent

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C07D 301/10 (2006.01) C07C 29/15 (2006.01) C07C 41/02 (2006.01) C07C 209/00 (2006.01) C07D 303/02 (2006.01) C07D 303/04 (2006.01)

Patent

CA 2759496

A method of producing an alkylene oxide includes passing a reaction mixture comprising alkylene, oxygen and a gaseous chlorine-containing promoter species over a supported catalyst containing silver and a promoting amount of rhenium to undergo an epoxidation reaction at a first operating condition. The method further includes subsequently performing the epoxidation reaction at a preferred operating condition. The preferred operating condition is characterized by an efficiency of the epoxidation reaction toward the alkylene oxide where the efficiency is lower than that of a maximum efficiency achievable at an operating temperature corresponding to the preferred operating condition.

L'invention porte sur un procédé de production d'un oxyde d'alkylène, qui consiste à faire passer un mélange réactionnel comprenant un alkylène, de l'oxygène et une espèce promotrice contenant du chlore gazeux, sur un catalyseur supporté contenant de l'argent, et une quantité promotrice de rhénium, pour subir une réaction d'époxydation dans une première condition d'exploitation. Le procédé comprend en outre la mise en uvre ultérieure de la réaction d'époxydation dans une condition d'exploitation préférée. La condition d'exploitation préférée est caractérisée par une efficacité de la réaction d'époxydation envers l'oxyde d'alkylène, où l'efficacité est inférieure à l'efficacité maximale pouvant être obtenue à une température d'exploitation correspondant à la condition d'exploitation préférée.

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