Process for the production of olefins

C - Chemistry – Metallurgy – 07 – C

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C07C 11/02 (2006.01) C07C 5/48 (2006.01) C10G 11/02 (2006.01) C10G 11/22 (2006.01)

Patent

CA 2414186

A process for the production of olefins such as ethylene from a hydrocarbon such as ethane. The process involves passing a mixture of the hydrocarbon and an oxagen-containing gas through a catalyst zone which is capable of supporting combustion beyond the fuel rich limit of flammability to produce the olefin. The catalyst zone comprises at least a first catalyst bed and a second catalyst bed. The second catalyst bed is located downstream of the first catalyst bed, is of a different composition to the first catalyst bed and comprises at least one metal selected from the group consisting of Mo, W, and Groups IB, IIB, IIIB, IVB, VB, VIIB and VIII of the Periodic Table. Suitably, the first catalyst bed comprises platinum and the second catalyst bed comprises tin- or copper-promoted nickel, cobalt or iridium catalyst or a copper-only catalyst.

L'invention concerne un procédé de préparation d'oléfines, telles que de l'éthylène provenant d'un hydrocarbone, tel que l'éthane. Le procédé consiste à passer un mélange d'hydrocarbones et un gaz renfermant de l'oxygène dans une zone de catalyseur qui est capable de supporter une combustion au-delà de la limite d'inflammabilité du combustible enrichi, en vue de produire l'oléfine. La zone de catalyseur comprend au moins une première couche catalytique et une seconde couche catalytique. La seconde couche catalytique est située en aval de la première couche catalytique et est d'une composition différente de celle de la première couche catalytique, et renferme au moins un métal sélectionné dans le groupe comprenant Mo, W, et les groupes IB, IIB, IIIB, IVB, VB, VIIB et VIII du tableau périodique. La première couche catalytique comprend, de manière appropriée, du platine et la seconde couche catalytique renferme du nickel activé à l'étain ou le cuivre, du cobalt ou un catalyseur d'iridium ou un catalyseur uniquement au cuivre.

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