Patent ID: 7964765
Filing Date: 2011-06-21
Classification: C07C

Abstract:
1. A process for the dehydrogenation of a functionally substituted aliphatic compound to form a functionally substituted aliphatic compound comprised of carbon-carbon double or triple bonds using recycled carbon dioxide comprising the steps of: (a) feeding a recycle carbon dioxide stream and a stream containing a functionally substituted aliphatic compound to a first oxydehydrogenation reactor containing at least one catalyst to convert functionally substituted aliphatic compound into a functionally substituted aliphatic compound comprised of carbon-carbon double or triple bonds; (b) separating the effluent from the oxydehydrogenation reactor into a gas recycle stream containing at least carbon dioxide, carbon monoxide, and hydrogen, a liquid dehydrogenation product mixture stream, and a water-rich stream; (c) feeding the gas recycle stream containing at least carbon dioxide, carbon monoxide and hydrogen and an oxygen-containing stream to at least one oxidizer to oxidize carbon monoxide and H (d) separating the dehydrogenation product mixture stream to separate functionally substituted aliphatic compound comprised of carbon-carbon double or triple bonds from the dehydrogenation product mixture; wherein the functionally substituted aliphatic compound in the feed stream is ethylbenzene and the functionally substituted aliphatic product is styrene monomer.