In various aspects, systems and methods are provided for operating an oxygen-fired catalyst regenerator with flue gas recycle and CO.sub.2 capture. An oxygen-fired catalyst regenerator contrasts with an air-fired regenerator. The oxygen-fired catalyst regenerator substantially reduces nitrogen within the system, which facilitates CO.sub.2 capture by reducing the energy required to capture CO.sub.2. In various aspects, a first portion of the regenerator flue gas is passed to a CO.sub.2 capture system and a second portion is recycled to the regenerator. Before the flue gas is recycled or diverted to the CO.sub.2 capture, it is passed to various processes that remove and/or reduce SO.sub.x, NO.sub.x, particulate, and water content. In various aspects, a portion of the treated flue gas may be combined with substantially pure O.sub.2 and recycled to the regenerator.

There is provided a method for the production of a pyrolysis oil from end-of-life plastics, the method comprising: (i) providing end-of-life plastics material; (ii) melting the end-of-life plastics material to form a molten plastics material; (iii) pyrolysing the molten plastics material in an oxygen-free atmosphere to provide pyrolysis gases and a char material; (iv) condensing the pyrolysis gases to provide the pyrolysis oil; wherein the method further comprises dispersing a zeolitic material in the end-of-life plastics material or in the molten plastics material, characterised in that the zeolitic material comprises a zeolite having a molar silica to alumina ratio (SAR) of from 10 to 140, a mean crystal size of about 200 nm or less, and wherein the zeolitic material has a mesopore volume of at least 0.30 cm3/g and a micropore volume of at least 0.10 cm3/g.

Methods for processing hydrocarbons may include passing a first portion of a catalyst to a first reaction zone and a second portion of the catalyst to a second reaction zone, contacting a hydrocarbon feed stream with the first portion of the catalyst to form a partially cracked hydrocarbon stream and a spent first portion of the catalyst, contacting the partially cracked hydrocarbon stream with the second portion of the catalyst to form a product and a spent second portion of the catalyst, removing at least a portion of hydrocarbons entrained within the spent first portion of the catalyst and the spent second portion of the catalyst in the stripper to form a stripped catalyst, regenerating at least a portion of the stripped catalyst to form a regenerated catalyst, and passing the regenerated catalyst to the first reaction zone and the second reaction zone.

A naphtha-to-aromatics fluidized bed device and a method thereof are provided. The device at least includes: a light hydrocarbon aromatization reactor; and a naphtha-to-aromatics reactor; the high-temperature regenerated catalyst is first directed into the light hydrocarbon aromatization reactor, and after cooling, subsequently introduced into the naphtha-to-aromatics reactor. The method includes using the above-mentioned device and a metal molecular sieve bifunctional catalyst. Under the action of the catalyst in the naphtha to aromatics reactor, naphtha is converted into a product gas containing aromatics, light alkanes, and other components. Light alkanes and the like separated from the product gas are further converted into aromatics and other components in the light hydrocarbon aromatization reactor. The method enables efficient and highly selective conversion of linear and branched aliphatic hydrocarbons into aromatics, with para-xylene content in the xylene mixture exceeding >50 wt %.

A process for converting light hydrocarbons into hydrogen and other valuable hydrocarbons includes reacting the light hydrocarbons with a catalyst in a reactor vessel at a reaction temperature and pressure to produce an intermediate product stream comprising hydrogen, methane, ethylene, acetylene, benzene, and polynuclear aromatics. The intermediate product stream is quenched and compressed after which the constituents of the intermediate product stream are separated.