Process for selective production of para dialkyl substituted ben

Details Process for selective production of para dialkyl substituted ben Process for selective production of para dialkyl substituted ben

1978-01-16

1978-11-28

Gantz, Delbert E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260671C, 260671M, 260672T, C07C 352, C07C 362

Patent

active

041276167

ABSTRACT:
A process is provided for the selective production of para dialkyl substituted benzenes wherein the alkyl group contains from 1 to 4 carbon atoms which comprises contacting, under conversion conditions, a hydrocarbon precursor selected from the group consisting of mono alkyl-substituted benzenes having 1-4 carbon atoms in the alkyl substituent and a mixture of said precursor or benzene with an alkylating agent containing from 1 to 4 carbon atoms with a catalyst comprising a porous crystalline aluminosilicate zeolite having deposited thereon a coating of silica which extensively covers and resides substantially exclusively on the external surface thereof, said zeolite being characterized by an activity, in terms of alpha value, of between about 2 and about 5000, a xylene sorption capacity greater than 1 gram/100 grams of zeolite and an ortho xylene sorption time for 30 percent of said capacity greater than 10 minutes, said sorption capacity and sorption time being measured at 120.degree. C and a pressure of 4.5 .+-. 0.8 mm. of mercury and recovering from the resulting product mixture, a para dialkyl substituted benzene in an amount greater than the thermodynamic equilibrium concentration thereof in the total dialkyl substituted benzenes produced.

REFERENCES:
patent: 3763260 (1973-10-01), Pollitzer
patent: 3965207 (1976-06-01), Weinstein
patent: 3965210 (1976-06-01), Chu
patent: 4060568 (1977-11-01), Rodewald

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