High severity process for xylene production employing a transalk

Details High severity process for xylene production employing a transalk High severity process for xylene production employing a transalk

1985-09-13

1987-02-10

Davis, Curtis R.

Chemistry of hydrocarbon compounds

Aromatic compound synthesis

By isomerization

585475, 585478, 585481, C07C 522

Patent

active

046424067

ABSTRACT:
A process is disclosed for the production of high quality benzene and a desired xylene isomer, preferably paraxylene, from a mixture of C.sub.7 -plus alkylaromatic hydrocarbons. The desired xylene isomer is recovered by absorptive separation from a stream of two or three xylene isomers. The resultant isomer-depleted stream is passed into a transalkylation zone together with both feed and recycled toluene and C.sub.9 aromatic hydrocarbons instead of being passed into a xylene isomerization zone. Benzene and xylenes are fractionated from the transalkylation zone effluent stream, with the xylenes being passed into the absorptive separation zone. A nonmetal catalyst is employed in the transalkylation zone, which must be operated at high severity (high temperature) conditions.

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