Patent ID: 8653317

Claim:
A process for dehydrogenating a hydrocarbon comprising: contacting a gaseous stream consisting essentially of: (a) at least one dehydrogenatable hydrocarbon selected from paraffinic hydrocarbons having from 2 to 20 carbons, alkylaromatic hydrocarbons having from 8 to 20 carbons, and mixtures thereof, hydrogen produced in situ by the dehydrogenation and a carrier fluid selected from the group consisting of one of the reactants in gaseous form, nitrogen, volatile hydrocarbons, carbon dioxide, and argon; or (b) at least one dehydrogenatable hydrocarbon selected from paraffinic hydrocarbons having from 2 to 20 carbons, alkylaromatic hydrocarbons having from 8 to 20 carbons, and mixtures thereof and hydrogen produced in situ by the dehydrogenation, in a dehydrogenation riser reactor with a supported dehydrogenation catalyst comprising a first component selected from the group consisting of indium and gallium, and compounds thereof; a second component selected from the group consisting of the metals of Group 8 of the Periodic Table of the Elements and compounds thereof; from 0.0 to 2 percent of an alkali metal or alkaline earth metal or compound thereof; and a support comprising silica-modified alumina in the gamma crystalline form wherein the catalyst has an average residence time within the riser reactor from 0.5 to 40 seconds and catalyst to hydrocarbon ratio of 5 to 100 on a weight to weight basis; transferring the hydrocarbon and catalyst from the dehydrogenation reactor to a separation device; and transferring catalyst from the separation device to a regenerator where the catalyst is contacted with an oxygen-containing gas and supplemental fuel.