Process for increasing the selectivity of a reaction to...

C - Chemistry – Metallurgy – 07 – C

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C07C 1/20 (2006.01) C07C 1/207 (2006.01) C07C 1/26 (2006.01) C07C 1/32 (2006.01)

Patent

CA 2374567

Disclosed is a method of making an olefin product from an oxygenate feedstock comprising, contacting the feedstock in a reaction zone containing 15 volume percent or less of a catalyst, preferably a catalyst comprising a silicoaluminophosphate molecular sieve. In order to obtain the desired product content, i.e., an olefin product having a low level of by-products, conversion of the feedstock in the 15 volume percent or less reaction zone should be maintained between 80 wt% and 99 wt% at the conditions effective to convert 100 wt% of the feedstock when the reaction zone contains at least 33 volume percent of the catalyst material.

L'invention concerne un procédé permettant de produire un produit oléfinique à partir d'une charge d'alimentation de produit oxygéné. Ce procédé consiste à mettre ladite charge d'alimentation en contact avec 15 pour cent en volume ou moins d'un catalyseur contenu dans une zone réactionnelle, ledit catalyseur comprenant de préférence un tamis moléculaire de silicoaluminophosphate. Pour obtenir la teneur en produit désirée, par exemple un produit oléfinique à faible teneur en sous-produits, la transformation de la charge dans la zone réactionnelle contenant 15 pour cent en volume ou moins doit être maintenue entre 80 % et 99 % en poids, dans des conditions efficaces pour transformer 100 % de ladite charge, lorsque la zone réactionnelle contient au moins 33 pour cent en volume du matériau catalyseur.

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