Process for producing styrene

Details Process for producing styrene Process for producing styrene

2005-04-26

2005-04-26

Dang, Thuan D (Department: 1764)

Chemistry of hydrocarbon compounds

Aromatic compound synthesis

Having alkenyl moiety, e.g., styrene, etc.

C585S441000, C585S443000

Reexamination Certificate

active

06884915

ABSTRACT:
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.

REFERENCES:
patent: 6388154 (2002-05-01), Hamana et al.
patent: 6461995 (2002-10-01), Addiego et al.
patent: 0 323 115 (1989-07-01), None
patent: 58-89945 (1983-05-01), None
patent: WO 9903806 (1999-01-01), None

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