Regioselective production of para-dialkyl benzenes
AssigneeMobil Oil Corporation
InventorsClarence D. Chang, Paul G. Rodewald
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Abstract
A method for the selective disproportionation of a substituted aromatic compound wherein the aromatic compound is passed over a catalytic molecular sieve which has been pre-selectivated with a silicon deposit and then subsequently treated with a silicon-containing, high efficiency p-xylene selectivating agent at conversion conditions. The present invention attains para-xylene product over 95% at a toluene conversion of at least 20%. The present invention also includes the highly para-selective catalyst which results from the pre-selectivation and subsequent treatment of a catalytic molecular sieve with a high efficiency p-xylene selectivating agent under the recited conditions.
Claims14
A toluene disproportionation process comprising:
- contacting a reaction stream comprising toluene, hydrogen and an organic silicon compound with a catalytic molecular sieve which has been pre-selectivated with a silicon-containing compound, said organic silicon compound or silicon-containing compound being selected from the group consisting of silicones, siloxanes, polysiloxanes, silanes and mixtures thereof, provided in the event that said organic silicon compound is an alkoxysilane, then said alkoxysilane has at least one silicon-hydrogen bond,
- said contacting taking place at reaction conditions suitable to provide a single pass para-xylene product purity, relative to all C.sub.8 products, of at least about 90% and concurrently therewith at least about 15% toluene conversion.
Dependencies are inferred from the claim text.