Systems and methods for making middle distillate product and lower olefins from hydrocarbon feedstock

Abstract

The present invention relates to a system comprising a riser reactor comprising a gas oil feedstock and a first catalyst under catalytic cracking conditions to yield a riser reactor product comprising a cracked gas oil product and a first used catalyst; a intermediate reactor comprising at least a portion of the cracked gas oil product and a second catalyst under high severity conditions to yield a cracked gasoline product and a second used catalyst; a regenerator to regenerate the first used catalyst to the second catalyst; and a draw-off vessel to remove undesirable gases from the second catalyst from the regenerator.

Description

technical field [0001] The present disclosure relates to systems and methods for producing middle distillate products and lower olefins from hydrocarbon feedstocks. Background technique [0002] Fluid catalytic cracking (FCC) of heavy hydrocarbons to produce lower boiling hydrocarbon products such as gasoline is well known in the art. The FCC process has existed since the 1940's. Typically, an FCC unit or process includes a riser reactor, a catalyst separator and stripper, and a regenerator. The FCC feed is introduced into the riser reactor where it contacts hot FCC catalyst from the regenerator. The mixture of feedstock and FCC catalyst flows through the riser reactor and into the catalyst separator where the cracked products are separated from the FCC catalyst. The separated cracked products flow from the catalyst separator to a downstream separation system, and the separated catalyst flows to the regenerator where coke deposited on the FCC catalyst during the cracking ...

AI Technical Summary

Problems solved by technology

These conditions often result in low middle distillate product yields and poor middle distillate product quality

Therefore, it is difficult

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