Process for producing light olefins

C - Chemistry – Metallurgy – 07 – C

Patent

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C07C 1/00 (2006.01) C07C 1/20 (2006.01)

Patent

CA 2327246

There is provided a process for converting methanol and/or dimethyl ether to a product containing C2-C4 olefins which comprises the step of contacting a feed which contains methanol and/or dimethyl ether with a catalyst comprising a porous crystalline material, the contacting step being conducted in the presence of a co-fed aromatic compound under conversion conditions including a temperature of 350 to 480 ~C and a methanol partial pressure in excess of 10 psia (70 kPa), the porous crystalline material having a pore size greater than the critical diameter of the aromatic compound and the aromatic compound being capable of alkylation by the methanol and/or dimethyl ether under the conversion conditions.

L'invention concerne un procédé permettant de transformer du méthanol et/ou du diméthyléther en un produit contenant des oléfines en C¿2?-C¿4?, qui comporte l'étape consistant à mettre en contact une charge d'alimentation contenant du méthanol et/ou du diméthyléther avec un catalyseur comportant une matière poreuse cristalline, l'étape de mise en contact étant réalisée en présence d'un composé aromatique alimenté conjointement, dans des conditions de transformation comprenant une température de 350 à 480 ·C et une pression partielle de méthanol supérieure à 10 psia (70 kPa), la matière poreuse cristalline présentant une dimension de pores supérieure au diamètre critique du composé aromatique, et le composé aromatique permettant une alkylation par le méthanol et/ou le diméthyléther dans les conditions de transformation.

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