A process for producing cumene and/or ethylbenzene from a mixed hydrocarbon feedstream comprising subjecting C6 cut separated from said mixed hydrocarbon feedstream to aromatization to provide an aromatization product stream and subjecting the thus obtained aromatization product stream to alkylation to produce an alkylated aromatic stream.

Methods for regenerating a spent catalyst are disclosed. Such methods may employ a step of chlorinating the spent catalyst in the gas phase, followed by decoking the chlorinated spent catalyst, and then fluorinating the de-coked catalyst in a fluorine-containing solution of a fluorine-containing compound.

Disclosed are a catalytic method and system for producing aromatic hydrocarbons from aliphatic hydrocarbons or light naphtha. In an aspect, the process comprises adding a diluent comprising a heavy aromatic hydrocarbon (for example, C.sub.7-C.sub.9+) to a reactor feedstock comprising aliphatic hydrocarbons (for example, C.sub.6-C.sub.8) or light naphtha to form a reactor feed stream, such that the heat capacity of reactor feed stream is higher than the heat capacity of feedstock. The reactor feed stream is heated and contacting with a catalyst under conditions sufficient to aromatize at least a portion of the aliphatic hydrocarbons and form a product stream comprising a primary aromatic hydrocarbon product and a heavy aromatic hydrocarbon product. In an aspect, the diluent can comprise a heavy aromatic hydrocarbon having at least one carbon atom more than the primary aromatic hydrocarbon product.

Disclosed are a catalytic method and system for producing aromatic hydrocarbons from aliphatic hydrocarbons or light naphtha. In an aspect, the process comprises adding a diluent comprising a heavy aromatic hydrocarbon (for example, C.sub.7-C.sub.9+) to a reactor feedstock comprising aliphatic hydrocarbons (for example, C.sub.6-C.sub.8) or light naphtha to form a reactor feed stream, such that the heat capacity of reactor feed stream is higher than the heat capacity of feedstock. The reactor feed stream is heated and contacting with a catalyst under conditions sufficient to aromatize at least a portion of the aliphatic hydrocarbons and form a product stream comprising a primary aromatic hydrocarbon product and a heavy aromatic hydrocarbon product. In an aspect, the diluent can comprise a heavy aromatic hydrocarbon having at least one carbon atom more than the primary aromatic hydrocarbon product.

Disclosed are a catalytic method and system for producing aromatic hydrocarbons from aliphatic hydrocarbons or light naphtha. In an aspect, the process comprises adding a diluent comprising a heavy aromatic hydrocarbon (for example, C.sub.7-C.sub.9+) to a reactor feedstock comprising aliphatic hydrocarbons (for example, C.sub.6-C.sub.8) or light naphtha to form a reactor feed stream, such that the heat capacity of reactor feed stream is higher than the heat capacity of feedstock. The reactor feed stream is heated and contacting with a catalyst under conditions sufficient to aromatize at least a portion of the aliphatic hydrocarbons and form a product stream comprising a primary aromatic hydrocarbon product and a heavy aromatic hydrocarbon product. In an aspect, the diluent can comprise a heavy aromatic hydrocarbon having at least one carbon atom more than the primary aromatic hydrocarbon product.

Provided is a method for producing p-xylene, comprising: a provision step of providing a C4 fraction comprising at least isobutene as a product formed by fluidized catalytic cracking of a heavy oil fraction; a dimerization step of bringing a first raw material comprising the isobutene into contact with a dimerization catalyst to produce a C8 component comprising a dimer of isobutene; and a cyclization step of bringing a second raw material comprising the C8 component with a dehydrogenation catalyst to produce p-xylene through a cyclization/dehydrogenation reaction of the C8 component.

Provided is a method for producing p-xylene, comprising: a provision step of providing a C4 fraction comprising at least isobutene as a product formed by fluidized catalytic cracking of a heavy oil fraction; a dimerization step of bringing a first raw material comprising the isobutene into contact with a dimerization catalyst to produce a C8 component comprising a dimer of isobutene; and a cyclization step of bringing a second raw material comprising the C8 component with a dehydrogenation catalyst to produce p-xylene through a cyclization/dehydrogenation reaction of the C8 component.

Methods for regenerating a spent catalyst are disclosed. Such methods may employ a step of chlorinating the spent catalyst in the gas phase, followed by decoking the chlorinated spent catalyst, and then fluorinating the de-coked catalyst in a fluorine-containing solution of a fluorine-containing compound.

Methods for regenerating a spent catalyst are disclosed. Such methods may employ a step of chlorinating the spent catalyst in the gas phase, followed by decoking the chlorinated spent catalyst, and then fluorinating the de-coked catalyst in a fluorine-containing solution of a fluorine-containing compound.

Methods for regenerating a spent catalyst in a metal reactor are disclosed. Such methods may employ a step of chlorinating the spent catalyst, followed by decoking the chlorinated spent catalyst, and then fluorinating the de-coked catalyst.