Selective disproportionation of toluene

Details Selective disproportionation of toluene Selective disproportionation of toluene

1977-01-21

1978-06-27

Davis, C.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 362

Patent

active

040975436

ABSTRACT:
A catalytic process is provided for the selective production of para-xylene by disproportionation of toluene in the presence of a catalyst comprising a crystalline aluminosilicate zeolite having a silica to alumina ratio of at least about 12 and a constraint index within the approximate range of 1 to 12, which catalyst has undergone controlled precoking, i.e. selectivation, by exposing the same to a thermally decomposable organic compound at a temperature in excess of the decomposition temperature of said compound, generally greater than 1000.degree. F., but less than about 1200.degree. F., at a hydrogen to organic compound mole ratio between 0 and 1 to deposit at least about 2 weight percent coke thereon and thereafter contacting toluene with the resulting coke-containing catalyst under disproportionation conditions including a temperature between about 800.degree. F. and 1025.degree. F., and preferably between about 825.degree. F. and 1000.degree. F., at a hydrogen to toluene mole ratio greater than 1 and up to about 10 and recovering a product mixture containing para-xylene in an amount greater than the thermodynamic equilibrium concentration thereof in the total xylenes produced.

REFERENCES:
patent: 3926872 (1975-12-01), Plank et al.
patent: 3957621 (1976-05-01), Bonacci et al.

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