Direct feed/effluent heat exchange in fluid catalytic cracking
AssigneeUop LLC
InventorsDavid A. Lomas, Peter J. Van Opdorp
Life of this patent
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Abstract
Fluid catalytic cracking (FCC) processes are described, in which hydroprocessed hydrocarbon streams or other hydrocarbon feed streams having a low coking tendency are subjected to direct heat exchange with the FCC reactor effluent, for example in the FCC main column. The processes operate with sufficient severity such that little or no net FCC main column bottoms liquid (e.g., with a 343° C. (650° F.) distillation cut point) is generated. Regeneration temperatures with the representative low coking tendency feeds are beneficially increased by using an oxygen-enriched regeneration gas stream.
Claims20
A fluid catalytic cracking (FCC) method comprising:
- (a) passing a hydroprocessed hydrocarbon stream to an FCC main column;
- (b) directly exchanging heat, in said FCC main column, between said hydroprocessed hydrocarbon stream and an FCC effluent stream to provide an FCC main column bottoms stream;
- and
- (c) contacting said FCC main column bottoms stream with a regenerated FCC catalyst in an FCC reaction zone to provide said FCC effluent stream.
An integrated process for producing a fluid catalytic cracking (FCC) gasoline product, the process comprising:
- (a) hydrocracking a heavy hydrocarbon feedstock in a hydrocracking reaction zone in the presence of hydrogen to provide a hydrocracking reaction zone effluent;
- (b) fractionating said hydrocracking zone effluent to provide one or more upgraded hydrocarbon products and a high boiling fraction;
- (c) directly exchanging heat between said high boiling fraction and an FCC effluent stream in an FCC main column to provide an FCC main column bottoms stream;
- (d) separating said FCC gasoline product, in one or more fractions, from said FCC effluent in said FCC main column;
- and
- (e) contacting said FCC main column bottoms stream with a regenerated catalyst in an FCC reaction zone to provide said FCC effluent stream.
A fluid catalytic cracking (FCC) method comprising:
- (a) contacting a hydrocarbon feed stream having a Conradson carbon residue of less than about 1% by weight with a regenerated FCC catalyst in an FCC reaction zone;
- and
- (b) regenerating a spent FCC catalyst from said FCC reaction zone with a regeneration gas stream comprising oxygen in an amount of greater than about 50% by volume.
Dependencies are inferred from the claim text.