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US 2011/0034647 A1Published application
Systems and methods for making a middle distillate product and lower olefins from a hydrocarbon feedstock
OwnerWeijian Mo, George A. Hadjigeorgeinventors
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Abstract
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; an intermediate reactor comprising at least a portion of the cracked gas oil product, a raffinate stream, and a second catalyst under high severity conditions to yield a cracked intermediate product and a second used catalyst; and a recycle conduit to send at least a portion of the cracked gas oil product to the riser reactor.
Claims27
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;
- an intermediate reactor comprising at least a portion of the cracked gas oil product, a raffinate stream, and a second catalyst under high severity conditions to yield a cracked intermediate product and a second used catalyst;
- and
- a recycle conduit to send at least a portion of the cracked gas oil product to the riser reactor.
1 more element
A method comprising:
- catalytically cracking a gas oil feedstock within an FCC riser reactor zone by contacting under suitable catalytic cracking conditions within said FCC riser reactor zone said gas oil feedstock with a first catalyst to yield an FCC riser reactor product comprising a cracked gas oil product and a first used catalyst;
- contacting an intermediate feedstock with a second catalyst within an intermediate cracking reactor operated under suitable high severity cracking conditions so as to yield a cracked intermediate product, comprising at least one lower olefin compound, and a second used catalyst, the intermediate feedstock comprising a raffinate stream;
- separating said cracked gas oil product into a plurality of cracked gas oil product streams;
- and
- recycling at least a portion of one or more of the cracked gas oil product streams to the riser reactor zone.
2 more elements
Dependencies are inferred from the claim text.