Patent ID: 6680418
Filing Date: 2004-01-20
Classification: C07C,Y02P

Abstract:
A process for converting methanol and/or dimethyl ether to a product containing C2 to C4 olefins which comprises the step of contacting a reaction mixture which contains methanol and/or dimethyl ether and at least 10 wt % of tetramethylbenzenes with a catalyst comprising a porous crystalline material, said contacting step being conducted under conversion conditions including a temperature of about 250Â° C. to about 500Â° C. and a methanol and/or dimethyl ether partial pressure of about 35 kPa to 1725 kPa, and said porous crystalline material having a Diffusion Parameter for 2,2-dimethylbutane of at least 500 secâˆ’1 when measured at a temperature of 120Â° C. and a 2,2-dimethylbutane pressure of 8 kPa.