Short contact time FCC process
OwnerGeorge Swan, Eduardo Mon +2inventors
InventorsGeorge Swan, Eduardo Mon, Steven Lowenthal, Bruce Cook
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Abstract
This invention relates to a short contact time (SCT) fluid catalytic cracking (FCC) process for improving the yield of distillates and gasoline. An SCT FCC process combines staging the FCC conversion process with interstage molecular separation of multi-ring aromatic species wherein separation of cat bottoms and recycling the separated stream containing saturates and 1- and 2-ring aromatics to the FCC unit results in improved yields of gasoline and other distillates while decreasing bottoms yields.
Claims14
A fluid catalytic cracking process which comprises:
- (a) contacting hydrocarbon feed with regenerated catalyst in a fluid catalytic cracking reactor operating under short contact time cracking conditions including a contact time of less than 5 seconds to form a cracked product;
- (b) separating cracked product from catalyst;
- (c) passing the separated cracked product into a fractionating zone and separating from the cracked product a bottoms stream;
- (d) passing the bottoms stream to a separation zone and separating the bottoms stream into a stream containing saturates and 1- and 2-ring aromatics and a stream containing predominantly aromatics having 3 or more rings;
- (e) combining the stream containing saturates and 1- and 2-ring aromatics with hydrocarbon feed in step (a) to form a combined feed and contacting combined feed with catalyst of step (a).
A fluid cracking process which comprises:
- (a) contacting hydrocarbon feed with regenerated catalyst in a fluid catalytic cracking reactor operating under short contact time cracking conditions including a contact time of less than 5 seconds to form a cracked product;
- (b) separating cracked product from catalyst;
- (c) passing the separated cracked product into a fractionating zone and separating from the cracked product a bottoms stream;
- (d) passing the bottoms stream to a separation zone and separating the bottoms stream into a stream containing saturates and 1- and 2-ring aromatics and a stream containing predominantly aromatics having 3 or more rings;
- (e) passing the stream containing saturates and 1- and 2-ring aromatics to step (a) wherein hydrocarbon feed and the stream containing saturates and 1- and 2-ring aromatics are separately contacted with regenerated catalyst.
Dependencies are inferred from the claim text.