Patent ID: 6884915

Claim:
A process for producing styrene by dehydrogenation of ethylbenzene, which comprises the steps of (i) feeding a raw material gas comprising ethylbenzene and steam to a first dehydrogenating step to produce a reacted gas comprising ethylbenzene, styrene and hydrogen in the presence of a dehydrogenation catalyst, (ii) feeding the reacted gas obtained in the first dehydrogenating step to an oxidizing step to combust at least part of hydrogen in the presence of an oxidation catalyst, and (iii) feeding the reacted gas obtained in the oxidizing step to a second dehydrogenating step to produce styrene from ethylbenzene in the presence of the dehydrogenation catalyst, with maintaining the carbon dioxide-generating ratio in the second dehydrogenating step at a level less than 2.1 times that at an initial stage of the reaction of the second dehydrogenation step.