Patent ID: 6222086
Filing Date: 2001-04-24
Classification: B01J,C07C

Abstract:
A process for the isomerization of a non-equilibrium feed mixture of 10 xylenes and ethylbenzene comprising contacting the feed mixture with a catalyst system comprising a physical mixture of a first catalyst comprising from about 0.1 to 2 mass-% of at least one platinum-group metal component, about 10 to 90 mass-% of at least one non-zeolitic molecular sieve, and an inorganic-oxide binder; and a second catalyst comprising from 0.02 to 0.08 mass-% of at least one platinum-group metal component, from about 10 to 99 mass-% of at least one zeolitic aluminosilicate, and an inorganic-oxide, wherein the content of platinum-group metal is no more than about 30% of the content of platinum-group metal in the first catalyst, at isomerization conditions comprising a temperature of from about 300.degree. to 600.degree. C., a pressure of from about 100 kPa to 5 MPa and a liquid hourly space velocity of from about 0.5 to 50 hr.sup.-1 with respect to the combined catalyst system to obtain an isomerized product comprising a higher proportion of at least one xylene isomer than in the feed mixture.