Patent ID: 8669406

Claim:
A process for dehydrogenating a hydrocarbon selected from at least one of: i) paraffinic hydrocarbons selected from ethane, propane, and butane; and ii) alkylaromatic hydrocarbons selected from ethylbenzene, propylbenzene and methylethylbenzene; comprising contacting a gaseous stream containing at least one of the hydrocarbons with a dehydrogenation catalyst comprising gallium and platinum and carried by an alumina or alumina silica support, at reaction temperature and in concurrent rising flow, at a catalyst to hydrocarbon ratio of 5 to 100 on a weight to weight basis, to a dehydrogenation reactor wherein the average contact time between the hydrocarbon and catalyst within the dehydrogenation reactor is from about 1 to about 4 seconds; and the temperature and pressure in the dehydrogenation reactor is from about 570 to about 750° C., and from about 6.0 to about 44.7 psia; and transferring the hydrocarbon and catalyst from the dehydrogenation reactor to a two stage solid-gas impingement separator comprising a cyclone separation device wherein the average contact time between the hydrocarbon and catalyst while at reaction temperature in the separation device is less than about 5 seconds and the total average contact time between the hydrocarbon, catalyst and resulting hydrocarbons while at reaction temperature is less than about 10 seconds; and transferring catalyst from the separation device to a regenerator where the catalyst is contacted with an oxygen-containing regeneration fluid and supplemental fuel.