Selective production of para dialkyl substituted benzenes

Details Selective production of para dialkyl substituted benzenes Selective production of para dialkyl substituted benzenes

1977-10-11

1978-09-26

Davis, C.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260671C, 260672T, 260673, 2606735, C07C 352, C07C 362

Patent

active

041170261

ABSTRACT:
A catalytic process is provided for the selective production of para dialkyl substituted benzenes containing alkyl groups of 1 to 4 carbon atoms, typified by para-xylene, by 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, e.g., toluene, ethyl benzene, propyl benzene, or butyl benzene; a C.sub.2 -C.sub.15 olefin and a C.sub.3 -C.sub.60 paraffin, or mixtures thereof including mixtures of benzene with at least one of the aforementioned olefins or paraffins with a zeolite-containing catalyst characterized by a xylene sorption capacity greater than 1 gram/100 grams of zeolite and an ortho xylene sorption time for 30 percent of said capacity of greater than 10 minutes, said sorption capacity and sorption time being measured at 120.degree. C and a xylene pressure of 4.5 .+-.0.8 mm. of mercury, said catalyst comprising a crystalline aluminosilicate zeolite having a silica to alumina ratio of at least about 12 and a constraint index, as hereinafter defined, within the approximate range of 1 to 12 and recovering from the resulting product mixture, a para dialkyl substituted benzene in an amount greater than the thermodynamic equilibrium concentration thereof in total dialkyl substituted benzenes produced.

REFERENCES:
patent: 3751504 (1973-08-01), Keown et al.
patent: 3926782 (1975-12-01), Plank et al.
patent: 3957621 (1976-05-01), Bonacci et al.

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