Process for making olefins

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 1/20 (2006.01) C07C 11/02 (2006.01) C07C 11/04 (2006.01) C07C 11/06 (2006.01) C10G 3/00 (2006.01) B01J 29/90 (2006.01) B01J 38/30 (2006.01)

Patent

CA 2446053

Disclosed is a method for converting an oxygenate feedstock to an olefin product. In particular, the method incorporates the use of a silicoaluminophosphate molecular sieve catalyst in the manufacture of ethylene and propylene. The method includes contacting an oxygenate-containing feedstock with a silicoaluminophosphate molecular sieve catalyst to form the olefin-containing product in a fluidized bed reactor apparatus including at least a reaction zone and a recirculation zone. Certain ratios of the mass of catalyst in the reaction zone to that of the sum of the mass of catalyst in both the reaction zone and the recirculation zone within the reactor apparatus are specified.

L'invention porte sur un procédé de conversion d'un apport d'oxygénate en oléfine, recourant en particulier à l'utilisation d'un catalyseur de silicoaluminophosphate à tamis moléculaire pour l'obtention d'éthylène et de propylène. Le procédé consiste à mettre en contact l'apport contenant l'oxygénate avec le dit catalyseur et à former un produit contenant l'oléfine dans un réacteur à lit fluidisé comportant au moins une zone de réaction et une zone de recirculation. Certains rapports entre la masse de catalyseur dans la zone de réaction et la somme des masses des catalyseurs de la zone de réaction et de la zone de recirculation du réacteur sont spécifiés.

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