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

摘要

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 intermediate reactor product and a second used catalyst; wherein the intermediate reactor feedstock comprises at least one of a fatty acid and a fatty acid ester.

主权项

1. A method comprising:
catalytically cracking a gas oil feedstock within an FCC riser reactor zone by contacting under suitable catalytic cracking conditions including a temperature of from 450 to 550° C., within said FCC riser reactor zone said gas oil feedstock with a first catalyst comprising a molecular sieve having cracking activity dispersed in a porous inorganic refractory oxide matrix or binder, to yield an FCC riser reactor product comprising a cracked gas oil product and a first used cracking catalyst, wherein the gas oil feedstock comprises a first portion comprising a heavy hydrocarbon feedstock and a second portion comprising at least one of a fatty acid and a fatty acid ester having from about 12 to about 25 carbon atoms; providing an intermediate reactor feedstock, wherein the wherein the intermediate reactor feedstock comprises a first portion comprising a hydrocarbon feedstock having a boiling temperature in the gasoline range and a second portion comprising at least one of a fatty acid and a fatty acid ester having from about 6 to about 10 carbon atoms; contacting the intermediate reactor feedstock with a second catalyst comprising a molecular sieve having cracking activity dispersed in a porous inorganic refractory oxide matrix or binder within an intermediate cracking reactor operated under suitable high severity cracking conditions including a temperature of from about 482° C. to about 871° C., to so as to yield a cracked intermediate reactor product, comprising at least one lower olefin compound, and a second used cracking catalyst; and separating said cracked intermediate reactor product into a lower olefin product comprising said at least one lower olefin compound.