Para-selective zeolite catalysts treated with halogen compounds
AssigneeMobil Oil Corporation
InventorWarren W. Kaeding
Life of this patent
Estimating the term…
Abstract
A process is provided for modifying ZSM-5 type zeolite catalysts with halogen-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. Halogen-based treating agents include HCl, HBr, Cl.sub.2, Br.sub.2, CCl.sub.4, GeCl.sub.4 and mixtures thereof. 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.
Claims11
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 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 gaseous medium containing a halogen-based treating agent selected from HCl, HBr, Cl.sub.2, Br.sub.2 and mixtures thereof under para-selectivity enhancing conditions.
Dependencies are inferred from the claim text.