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US 6,576,581 B1Granted
Aromatics isomerization using a dual-catalyst system
AssigneeUop LLC
InventorsSanjay B. Sharma, Aaron J. Imrie
Life of this patent
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Abstract
This invention is drawn to a catalyst system comprising two or more molecular sieves, including at least one non-zeolitic molecular sieve and one zeolitic aluminosilicate, having specified contrasting pore structures and to a process for isomerizing a non-equilibrium mixture of xylenes and ethylbenzene using the subject catalyst system to obtain an improved yield of para-xylene from the mixture relative to prior-art processes.
Claims10
A catalyst system comprising a combination of:
- (a) 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,
- (b) a second catalyst comprising from about 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 binder, wherein the content of platinum-group metal is no more than about 30% of the content of platinum-group metal in the first catalyst.
Dependencies are inferred from the claim text.