Patent ID: 8981171
Filing Date: 2015-03-17
Classification: C07C,Y02P

Abstract:
1. A process comprising selective production of paraxylene by the alkylation of benzene and/or toluene with methanol to produce a product stream having high concentrations of C8 aromatics and low concentrations of oxygenate by-products, wherein said process includes a step of removing the oxygenate by-products removal from the product stream and then a step of recovery of the C8 aromatics by simulated counter-current adsorption, wherein said alkylation comprises the contact of benzene and/or toluene with methanol in the presence of a catalyst comprising a porous crystalline material having a Diffusion Parameter for 2,2 dimethylbutane of about 0.1-15 sec −1 when measured at a temperature of 120° C. and a 2,2 dimethylbutane pressure of 60 torr (8 kPa), wherein said porous crystalline material has undergone prior treatment with steam at a temperature of at least 950° C. for between about 10 minutes and about 100 hours to adjust the Diffusion Parameter of said material to about 0.1-15 sec −1 .