Para-selective zeolite catalysts treated with sulfur compounds
AssigneeMobil Oil Corporation
InventorWarren W. Kaeding
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Abstract
A process is provided for modifying ZSM-5 type zeolite catalysts with sulfur-based treating agents in order to enhance the para-selective properties of such catalysts for the conversion of aromatic materials to dialkyl-substituted benzene compounds. Sulfur-based treating agents include hydrogen sulfide and sulfur dioxide. Catalyst compositions so treated can be used in alkylation, transalkylation or disproportionation processes to provide product mixtures having exceptionally high concentrations of the para-dialkylbenzene isomer.
Claims12
A process for converting aromatic compounds to a dialkyl benzene compound mixture highly enriched in the para-dialkylbenzene isomer, said process comprising contacting said aromatic compounds under conversion conditions with a modified zeolite based catalyst comprising a crystalline zeolite material characterized by a silica to alumina ratio of at least 12 and a constraint index of from about 1 to 12, said catalyst having been contacted with a sulfur-based treating agent selected from hydrogen sulfide and sulfur dioxide under para-selectivity enhancing conditions.
Dependencies are inferred from the claim text.