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US 2002/0165418 A1Published application
Process for producing styrene
AssigneeMitsubishi Chemical Corporation
InventorsShuji Obayashi, Takahito Nishyama
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AssigneeMitsubishi Chemical Corporation
InventorsShuji Obayashi, Takahito Nishyama
Estimating the term…
The present invention is a process for producing styrene by dehydrogenation of ethylbenzene, which contains the steps of (i) feeding a raw material gas containing ethylbenzene and steam to a first dehydrogenating step to produce a reacted gas containing 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 the initial stage of the reaction.
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 the initial stage of the reaction.
A process for producing styrene by dehydrogenation of ethylbenzene in the presence of a potassium-containing, iron-based catalyst, which comprises filling a catalyst showing a lower potassium-flying rate in the upstream portion of the catalyst-packed bed within the dehydrogenation reactor.
Dependencies are inferred from the claim text.