Aromatic conversion reactions with zeolitic catalyst composition

Chemistry of hydrocarbon compounds – Aromatic compound synthesis – By condensation of entire molecules or entire hydrocarbyl...

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585470, 585471, C07C 268

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active

048990078

ABSTRACT:
There are provided aromatic conversion reactions for preparation of dialkyl benzenes, such as xylene and ethyltoluene, of enhanced para isomer content with a zeolitic catalyst composition of improved shape selectivity. The catalysts comprise certain zeolites which have been calcined at a high temperature of at least 649.degree. C. (i.e., 1200.degree. F.). These zeolites have a silica/alumina ratio of at least about 12 and a constraint index within the approximate range of 1 to 12. Examples of such zeolites include ZSM-5 and ZSM-11.

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