Abstract: A process for the production of propylene and high octane blending components from C.sub.3 and C.sub.4 hydrocarbons that provides the dual benefit of flexibility between alkylate and propylene products while allowing the processing of large amounts of normal butane. The process includes the steps of passing a combined feed of C.sub.3 and C.sub.4 hydrocarbons to a dehydrogenation zone, contacting the feed stream with a dehydrogenation catalyst, and recovering an effluent containing C.sub.3 and C.sub.4 olefins and admixing the effluent with another feed comprising paraffins and olefins having from 3-4 carbon atoms and recovering an intermediate stream. The intermediate stream enters a separation zone, which removes C.sub.2 hydrocarbons and lower boiling materials from the process, recovers a first propylene product stream, produces an alkylation zone feed stream containing C.sub.3 and C.sub.4 hydrocarbons, and produces a recycle stream.