In accordance with one or more embodiments of the present disclosure, a process for converting diesel to products comprising light olefins, benzene-toluene-xylenes (BTX), fluid catalytically cracked naphtha, pyrolysis gasoline, and pyrolysis fuel oil includes: introducing a diesel feedstream to a diesel hydrodesulfurization unit to produce a desulfurized diesel stream; introducing the desulfurized diesel stream to a fluid catalytic cracking (FCC) unit to produce the fluid catalytically cracked naphtha, a light gas stream, and a cycle oils stream; introducing the fluid catalytically cracked naphtha to an aromatic recovery complex to produce the BTX and an aromatic bottoms stream; and introducing a paraffinic fraction of the light gas stream to a steam cracking unit to produce a light olefins stream, the pyrolysis gasoline, and the pyrolysis fuel oil.

A reactor and a process for fluid catalytic cracking (FCC) a hydrocarbon feed in the riser-reactor, the process including injecting the hydrocarbon feed into an evaporation zone of the riser-reactor, injecting a first catalyst into the evaporation zone, wherein the first catalyst mixes with the hydrocarbon feed to generate a hydrocarbons stream in the evaporation zone, and wherein the temperature in the evaporation zone is less than 625° C., and passing the hydrocarbons stream from the evaporation zone into a cracking zone of the riser-reactor to generate a cracked product in the cracking zone.

Systems and methods for producing light olefins via catalytic cracking of naphtha are disclosed. A naphtha feed stream and lift gas stream are fed into a plurality of dense phase riser reactors, each of which is operated with a high solid volume fraction, a high superficial velocity, and minimum back mixing. The effluent stream from each dense phase riser reactor is further separated, in a secondary reactor, to form a gaseous product stream and a catalyst stream. The catalyst stream is stripped to remove the hydrocarbons adsorbed on the catalyst particles. The stripped catalyst is regenerated in a regenerator.

Disclosed is a method of catalytically cracking naphtha in a fluidized bed. Effluent from the fluidized bed is separated into catalyst particles and gas product by a cyclone having a loop seal connected to the cyclone's dipleg.

Systems and methods for producing aromatics and olefins via catalytic cracking are disclosed. A naphtha feed stream and lift gas stream are fed into one or more dense phase riser reactors, each of which is operated with a high solid volume fraction, a high superficial velocity, high back mixing. The effluent streams from all the dense phase riser reactors is further separated, in a secondary reactor, into a gaseous product stream and a catalyst stream. The catalyst stream is stripped to remove the hydrocarbons absorbed on the catalyst particles. The stripped catalyst is regenerated in a regenerator.

An operating condition estimation system includes: a learning apparatus that learns a condition estimator for estimating an operating condition of a fluid catalytic cracking apparatus from information that can be acquired while the fluid catalytic cracking apparatus is being operated, the fluid catalytic cracking apparatus including a reaction apparatus in which a catalyst is used and a regeneration apparatus for regenerating the catalyst; and an operating condition estimation apparatus that estimates the operating condition of the fluid catalytic cracking apparatus by using the condition estimator learned by the learning apparatus.

In accordance with one or more embodiments of the present disclosure, a process for converting diesel to products comprising light olefins, benzene-toluene-xylenes (BTX), fluid catalytically cracked naphtha, pyrolysis gasoline, and pyrolysis fuel oil includes: introducing a diesel feedstream to a diesel hydrodesulfurization unit to produce a desulfurized diesel stream; introducing the desulfurized diesel stream to a fluid catalytic cracking (FCC) unit to produce the fluid catalytically cracked naphtha, a light gas stream, and a cycle oils stream; introducing the fluid catalytically cracked naphtha to an aromatic recovery complex to produce the BTX and an aromatic bottoms stream; and introducing a paraffinic fraction of the light gas stream to a steam cracking unit to produce a light olefins stream, the pyrolysis gasoline, and the pyrolysis fuel oil.

Apparatus and processes herein provide for converting hydrocarbon feeds to light olefins and other hydrocarbons. The processes and apparatus include a conventional riser reactor in combination with a mixed flow (e.g., including both counter-current and co-current catalyst flows) fluidized bed reactor designed for maximizing light olefins production. The effluents from the riser reactor and mixed flow reactor are processed in a catalyst disengagement vessel, and the catalysts used in each reactor may be regenerated in a common catalyst regeneration vessel. Further, integration of the two-reactor scheme with a catalyst cooler provides a refinery the flexibility of switching the operation between the two-reactor flow scheme, a catalyst cooler only flow scheme, or using both simultaneously.

An addition system for introducing particulate material into an industrial process is disclosed. The addition system comprises a vessel for holding the particulate material, wherein the vessel has a top and a bottom; one or more weighing devices; a controller for controlling operation of the addition system; a base plate to support the vessel and optionally the controller; and three or more legs, each leg having an uppermost section that connects to the vessel and a foot that is connected to the base plate. The widest diameter of the vessel is less than the diameter of a circle drawn through the feet of the legs. The one or more weighing device are mounted on the base plate and support the legs of the vessel.

A withdrawal system for withdrawing particulate matter from a high-temperature unit of a high-temperature industrial process is disclosed. The withdrawal system comprises a material storage silo that comprises a vent line containing a first vent valve, one or more temperature sensors to measure temperature of the particulate matter in the material transfer line, and a controller that receives output measurements from the one or more temperature sensors to monitor and control flow of the particulate matter. The system does not contain a receiving vessel located in the material transfer line between the high-temperature unit and the material storage silo.