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Abstract

There is provided a process for converting methanol and/or dimethyl ether to a product containing olefin, e.g., C.sub.2 to C.sub.4 olefins, C.sub.9+ aromatics and non-C.sub.9+ aromatics which comprises: 1) contacting a feed which contains methanol and/or dimethyl ether with a catalyst comprising a porous crystalline material, said contacting step being conducted in the presence of aromatics comprising C.sub.9 or C.sub.9+ aromatic compound produced in said process under conversion conditions including a temperature of 350.degree. C. to 480.degree. C. and a methanol partial pressure in excess of 10 psia (70 kPa), said porous crystalline material having a Diffusion Parameter for 2,2-dimethylbutane of about 0.1 sec.sup.-1 to about 20 sec.sup.-1 when measured at a temperature of 120.degree. C. and a 2,2-dimethylbutane pressure of 60 torr (8 kPa), and the aromatics being capable of alkylation by the methanol and/or dimethyl ether under said conversion conditions to provide a stream which contains C.sub.2 to C.sub.4 olefins and C.sub.9 or C.sub.9+ aromatic compound; 2) separating said stream to form a substantially C.sub.2 to C.sub.4 olefin product stream and a substantially C.sub.9 or C.sub.9+ aromatic compound stream; and 3) recycling at least a portion of said substantially C.sub.9 or C.sub.9+ aromatic compound stream to step 1).

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