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US 2004/0105790 A1Published application
Riser termination device
AssigneeStone & Webster Process Technology, Inc.
InventorKelly Benham
Life of this patent
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Abstract
The present invention provides a novel separator for use in hydrocarbon cracking process and a novel spent catalyst stripping device and process.
Claims30
A riser termination device comprising:
- (a) a separation unit for receiving a gas-solids mixture from a riser and for separating solids from gas, said separation unit comprising:
- (i) a substantially cylindrical internal downcomer pipe having an inlet, a downcomer portion having a vertical window located in a portion of said downcomer, and a downcomer floor provided with a solids distribution plate;
- and
- (ii) a vapor outlet duct suitable for receiving gases from said vertical window and located concentrically outside said internal downcomer pipe and extending upwardly;
- and
- (b) a crossover duct for connecting a riser reactor to the inlet of said internal downcomer pipe.
3 more elements
A bath tub solids container for containing solids separated from cracked product vapors from a separator, said bath tub solids container comprising:
- a containment means for receiving and containing solids from said separator;
- an aeration means for fluidizing solids contained in said containment means;
- and a fluidized solids outlet means for allowing fluidized solids to exit the containment means.
A process for separating solids from cracked products comprising:
- (a) withdrawing a mixed solids and cracked product stream from a riser reactor through a crossover duct located substantially 90° to said riser reactor;
- (b) directing said mixed solids and cracked product stream against an impact plate to initially separate said cracked products from said solids and to change the direction of the cracked products and solids 90° downwardly in a capped downcomer pipe;
- (c) collecting said initially separated solids on a floor of said downcomer pipe to further degas said solids and separate additional cracked product;
- (d) allowing said solids from said floor bed to slide out of the bottom of said downcomer pipe;
- (e) withdrawing cracked products from said initial separation and from said degassing, along with a minor amount of entrained solids, out a window located in a lower portion of said downcomer pipe into a concentrically located vapor outlet duct;
- and
- (f) separating the majority of catalyst from horizontal flow out of said window by slowing down the gas directed against an inner wall of the separator and turning the gas flow upwards in the vapor outlet duct while the catalyst slows down and is withdrawn through a catalyst shave-off window in the bottom of the vapor outlet duct;
- (g) providing a catalyst concentration point and a third stage of catalyst separation at the top of the vapor outlet duct, said separation providing for ensuring very low catalyst content in the cracked products and allowing for the utilization of smaller, more efficient final catalyst removal systems;
- (h) withdrawing said cracked products and entrained solids out the top of said vapor outlet duct and into a secondary cyclone for further separation of said entrained solids from said cracked products;
- and
- (i) recovering said cracked products.
8 more elements
Dependencies are inferred from the claim text.