A method and apparatus for processing a hydrocarbon stream are described. The method includes heating a feed stream in a convective bank. The heated feed stream is reacted in a first reaction zone to form a first effluent, which is heated in a first radiant cell. The first radiant cell combusts fuel to heat the first effluent and forms a first exhaust gas. The first exhaust gas is contacted with the convective bank to heat the feed stream. The outlet temperature the heated feed stream from the convective bank is controlled by introducing an additional gas stream into the convective bank. There can be additional reaction zones and radiant heaters.

Processes and systems are disclosed for improving the yield from reforming processes. Aromatic complex bottoms, or a heavy fraction thereof, are subjected to hydrogenation/hydrocracking, followed by catalytic conversion, to produce additional gasoline and higher-quality aromatic compounds.

Processes and systems are disclosed for improving the yield from reforming processes. Aromatic complex bottoms, or a heavy fraction thereof, are subjected to hydrodearylation and hydrogenation to produce additional gasoline blending components and aromatic products.

A process for cracking an olefinic feed comprising diolefins and monoolefins is provided. The process comprises selectively hydrogenating the olefinic feed in a hydrogenation reactor to convert the diolefins to monoolefins to provide a hydrogenated effluent stream. The hydrogenated effluent stream is vaporized to provide a vaporized hydrogenated effluent stream. The vaporized hydrogenated effluent stream is passed to an olefin cracking reactor to provide a cracked olefin stream comprising C.sub.2 and C.sub.3 olefins. The cracked olefin stream is passed to a recycle column to provide one of an overhead vapor stream comprising C.sub.5− hydrocarbons or a side draw vapor stream comprising C.sub.6+. At least a portion of the overhead vapor stream or the side draw vapor stream is recycled to the olefin cracking reactor.

A process for cracking an olefinic feed comprising diolefins and monoolefins is provided. The process comprises selectively hydrogenating the olefinic feed in a hydrogenation reactor to convert the diolefins to monoolefins to provide a hydrogenated effluent stream. The hydrogenated effluent stream is vaporized to provide a vaporized hydrogenated effluent stream. The vaporized hydrogenated effluent stream is passed to an olefin cracking reactor to provide a cracked olefin stream comprising C.sub.2 and C.sub.3 olefins. The cracked olefin stream is passed to a recycle column to provide one of an overhead vapor stream comprising C.sub.5− hydrocarbons or a side draw vapor stream comprising C.sub.6+. At least a portion of the overhead vapor stream or the side draw vapor stream is recycled to the olefin cracking reactor.

The present disclosure is directed to refinery processes and systems for producing petrochemicals including aromatic products, and hydrogen carriers. Embodiments include those with increased naphtha production, increasing reformer feed. An aromatic rich stream is separated in an aromatic recovery complex to produce BTX, and all or a portion of BTX products subjected to hydrogenation to produce cyclohexanes.

The present disclosure is directed to refinery processes and systems for producing petrochemicals including aromatic products, and hydrogen carriers. Embodiments include those with increased naphtha production, increasing reformer feed. An aromatic rich stream is separated in an aromatic recovery complex to produce BTX, and all or a portion of BTX products subjected to hydrogenation to produce cyclohexanes.

Systems and methods include an aromatics complex (ARC), the ARC in fluid communication with a naphtha reforming unit (NREF) and operable to receive a reformate stream produced by the NREF, and the ARC further operable to separate the reformate stream into a gasoline pool stream, an aromatics stream, and an aromatic bottoms stream; and a hydrodearylation unit operable to receive heavy, non-condensed, alkyl-bridged, multi-aromatic compounds from the aromatic bottoms stream, the hydrodearylation unit further operable to hydrogenate and hydrocrack the heavy, non-condensed, alkyl-bridged, multi-aromatic compounds to produce a stream suitable for recycle to the NREF or the reformate stream, where the hydrodearylation unit is further operable to receive hydrogen produced in the NREF.

Systems and methods include an aromatics complex (ARC), the ARC in fluid communication with a naphtha reforming unit (NREF) and operable to receive a reformate stream produced by the NREF, and the ARC further operable to separate the reformate stream into a gasoline pool stream, an aromatics stream, and an aromatic bottoms stream; and a hydrodearylation unit operable to receive heavy, non-condensed, alkyl-bridged, multi-aromatic compounds from the aromatic bottoms stream, the hydrodearylation unit further operable to hydrogenate and hydrocrack the heavy, non-condensed, alkyl-bridged, multi-aromatic compounds to produce a stream suitable for recycle to the NREF or the reformate stream, where the hydrodearylation unit is further operable to receive hydrogen produced in the NREF.

Processes and systems are disclosed for improving the yield from reforming processes. Aromatic complex bottoms, or a heavy fraction thereof, are subjected hydrogenation to produce additional gasoline and higher-quality aromatic compounds.