METHOD FOR PRODUCING STYRENE

摘要

PROBLEM TO BE SOLVED: To provide a method for producing styrene in a high yield for a long period by suppressing formation of carbon dioxide in between a spot where dehydrogenation product gas and oxygen-containing gas are mixed and an oxidation-step inlet. SOLUTION: The method for producing styrene comprises a dehydrogenation step (1) for reacting a feed gas containing at least ethylbenzene and steam in the presence of a dehydrogenation catalyst; an oxidation step (2) for reacting at least part of hydrogen contained in the dehydrogenation product gas obtained in the dehydrogenation step in the presence of an oxidation catalyst and in the coexistence of the oxygen-containing gas; and another dehydrogenation step (3) for reacting the oxidation product gas obtained in the oxidation step in the presence of a dehydrogenation catalyst. In the method for producing styrene, in supplying the step (2) with the mixed gas of the dehydrogenation product gas obtained in the step (1) and the oxygen-containing gas, the combustion rate by oxygen is controlled to be 15% or lower in the section between the spot where the dehydrogenation product gas and the oxygen-containing gas are mixed and the inlet of the step (2). COPYRIGHT: (C)2007,JPO&INPIT