Patent ID: 7247762
Filing Date: 2007-07-24
Classification: C07C

Abstract:
1. A process for isomerizing xylenes present in a feed containing ethylbenzene comprising: contacting said feed under conversion conditions with a catalyst system containing a first catalyst and a second catalyst, said first catalyst being unselectivated and comprising: (a) an intermediate pore size zeolite; (b) Re to deethylate ethylbenzene; and (c) an amorphous binder, said first catalyst requiring at least 50 minutes to sorb 30% of the equilibrium capacity of ortho-xylene at 120° C. and at an ortho-xylene partial pressure 4.5±0.8 mm of mercury; and said second catalyst comprises an intermediate pore size zeolite and requires less than 50 minutes to sorb 30% of the equilibrium capacity of ortho-xylene at 120° C. and at an ortho-xylene partial pressure of 4.5±0.8 mm of mercury; wherein the amount of said first catalyst present in said catalyst system is an amount greater than 55 percent and by volume based on the sum of the volumes of the first catalyst and second catalyst.