Mitsubishi Petrochemical Company Limited

Hirotaka Takano

Hideyuki Takahashi

Kohji Kato

Ryoichi Hirogohri

A process for producing styrene by dehydrogenation of ethylbenzene comprising feeding steam and ethylbenzene to three or more dehydrogenation reactors connected in series, an intermediate heater for heating the reaction mixture through heat exchange with steam being provided between each of said dehydrogenation reactors, said steam being first used as a medium to heat the respective intermediate heaters, and then mixed with ethylbenzene supplied as the feed to the first of said series of reactors, wherein 3 to 10 mols of steam are mixed with one mol of ethylbenzene and the temperature and pressure at the inlet of the final dehydrogenation reactor are 600.degree.-680.degree. C. and 0.4-0.8 Kg/cm.sup.2 (abs.), respectively, is disclosed.

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Yokkaichi, Japan

Hirotaka Takano