Process for isomerization of unextracted, ethylbenzene-containin

Details Process for isomerization of unextracted, ethylbenzene-containin Process for isomerization of unextracted, ethylbenzene-containin

1988-09-29

1990-02-06

Davis, Curtis R.

Chemistry of hydrocarbon compounds

Aromatic compound synthesis

By isomerization

585481, C07C 522

Patent

active

048990108

ABSTRACT:
An improved process employing a supported, platinum-containing, crystalline, silicate molecular sieve catalyst composition effective in removing ethylbenzene from unextracted xylene feeds during isomerization, primarily by hydrodeethylation, and also the primarily C.sub.9 paraffins and naphthenes. Choosing (1) a set of process conditions within narrow ranges of temperature T, total pressure P, and hydrogen to hydrocarbon mol ratio H/HC such that Z, which is defined as a function of T, P and H/HC, is less than about 0.01, and (2) a platinum-containing catalyst composition, greatly reduces the feed C.sub.9 paraffins and naphthenes content during isomerization, removes most of the ethylbenzene by hydrodeethylation to ethane and benzene, and minimizes xylene loss to hydrogenation and cracking, all without substantially changing the excellent isomerization properties of the sieve catalyst composition.

REFERENCES:
patent: 4268420 (1981-05-01), Klotz
patent: 4285919 (1981-08-01), Klotz et al.
patent: 4593138 (1986-06-01), Czsci et al.
patent: 4620921 (1986-11-01), Chang et al.
patent: 4654456 (1987-03-01), Nimry
patent: 4717780 (1988-01-01), Olson et al.

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