The present disclosure relates to processes for the removal of paraffins. The processes generally include providing a C.sub.4 containing stream including isobutylene, 1-butene, 2-butene, n-butane and isobutane, introducing the C.sub.4 containing stream into a paraffin removal process to form an olefin rich stream, wherein the paraffin removal process is selected from extractive distillation utilizing a solvent including an organonitrile, passing the C.sub.4 containing stream over a semi-permeable membrane and combinations thereof; and recovering the olefin rich stream from the paraffin removal process, wherein the olefin rich stream includes less than 5 wt. % paraffins.

In a Fluid Catalytic Cracker (FCC) unit being operated in petrochemical mode that has an increased dry gas and LPG production that creates a bottleneck in product flow, a method for full or partial separation of light gas components from a wet gas compressor suction stream and routing it directly to an untreated fuel gas header using a parallel system to an existing wet gas compressor, which parallel system includes an auxiliary compressor and a membrane separation system.

Methods and apparatuses are provided for isomerizing a hydrocarbon stream. The method includes isomerizing a hydrocarbon stream in a reactor to produce an intermediate isomerized stream. The intermediate isomerized stream is fractionated to produce an off gas stream and a heavy isomerized stream, where the off gas stream includes an off gas recycle stream. The off gas recycle stream is dried in an off gas dryer to produce a hydrogen recycle stream, where the off gas drier includes an off gas dryer membrane separating the off gas recycle stream from an off gas purge stream. The off dryer membrane includes a perfluorosulfonated ionomer. The hydrogen recycle stream is then fed into the reactor.

A method comprises separating a hydrocarbon feed stream having carbon dioxide into a heavy hydrocarbon stream and a light hydrocarbon stream. The light hydrocarbon stream is separated into a carbon dioxide-rich stream and a carbon dioxide-lean stream. At least a portion of the carbon dioxide-lean stream is fed to a hydrocarbon sweetening process. Another method comprises receiving a hydrocarbon feed stream that comprises 30 molar percent to 80 molar percent carbon dioxide. A heavy hydrocarbon stream is separated from the hydrocarbon feed stream, wherein the heavy hydrocarbon stream comprises at least 90 molar percent C.sub.3+ hydrocarbons. A carbon dioxide-rich stream is separated from the hydrocarbon feed stream, wherein the carbon dioxide-rich stream comprises at least 95 molar percent carbon dioxide.

The presently disclosed concepts relate to systems and methods for effluent stream abatement via pyrolytic emission looping. In use, the systems and methods include a feed gas stream, and at least one dissociating reactor that receives the feed gas stream. The at least one dissociating reactor outputs, at least in part, a carbon allotrope material and a discharge pyrolytic emissions stream. Additionally, a gas separating system is used to separate the discharge pyrolytic emissions stream into at least one species component, where the at least one species component is added to at least the feed gas stream.