METHOD OF PRODUCING STYRENE MONOMER VIA OXIDATIVE DEHYDROGENATION OF ETHYLBENZENE USING CO AS SOFT OXIDANT Russian patent published in 2012 - IPC C07C5/333 C07C15/46 C07C5/32 

FIELD: chemistry.

SUBSTANCE: invention relates to versions of a method of dehydrogenating ethylbenzene to styrene using recycled carbon dioxide. One of the versions includes the following steps: (a) feeding a recycle carbon dioxide stream and a stream containing ethylbenzene into a first oxydedrogenation reactor containing at least one catalyst for converting ethylbenzene to styrene; (b) separating the stream coming out of the oxydehydrogenation reactor into a recycle gas stream containing at least carbon dioxide, carbon monoxide and hydrogen, a liquid dehydrogenation product mixture stream and a water-rich stream; (c) feeding the recycle gas stream containing at least carbon dioxide, carbon monoxide and hydrogen and an oxygen-containing stream into at least one oxidation reactor to oxidise carbon monoxide and H₂ in the recycle gas stream to obtain the recycle carbon dioxide stream and to heat the recycle carbon dioxide stream; (d) separating the dehydrogenation product mixture stream to extract styrene from the mixture of dehydrogenation products.

EFFECT: method enables to save on power and is environmentally friendly.

15 cl, 3 dwg