Method for preparing p-isobutylstyrene

Details Method for preparing p-isobutylstyrene Method for preparing p-isobutylstyrene

1994-10-17

1995-07-25

Pal, Asok

Chemistry of hydrocarbon compounds

Plural serial diverse syntheses

To produce aromatic

585322, 585440, 585444, 585445, 585470, C07C 527, C07C 5333

Patent

active

054364027

ABSTRACT:
A method for preparing a high-purity p-isobutylstyrene is here disclosed which comprises the first step of reacting o- and/or m-isobutylethylbenzene, if necessary, together with isobutylbenzene, in the presence of an acid catalyst in a liquid phase at a reaction temperature of -10.degree. to 600.degree. C. so that the production of sec-butylethylbenzene in butylethylbenzene may not exceed 20% by weight, in order to form a mixture of p-isobutylethylbenzene and sec-butylethylbenzene; and the second step of bringing the mixture of p-isobutylethylbenzene and sec-butylethylbenzene recovered from the first step into contact with a dehydrogenation metal catalyst containing at least one metal selected from the groups Ib, IIb, VIa, VIIa and VIII of the periodic table at a reaction temperature of 300.degree. to 650.degree. C. under a reaction pressure of 50 kg/cm.sup.2 or less in a gaseous phase.

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