Fractionation method with quench liquid recycle
AssigneeWilliams, Phillips & Umphlett
InventorFrank W. Skraba
Life of this patent
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Abstract
Method and apparatus for fractionating a hot vaporous hydrocarbon feed from a fluid catalytic cracking reactor wherein the hot vaporous feed is introduced into a fractionator zone near one end thereof and liquid is removed from a liquid collection zone and cooled in a heat extraction zone. A first portion of the cooled liquid is returned to a location between the liquid collection zone and the point of introduction of the vaporous feed and sprayed directly on hot condensed liquid flowing downwardly over an inclined baffle plate to quickly quench the liquid below the temperature at which polymerization of the constituents of the liquid can occur.
Claims8
In a method of fractionating a hot vapor containing feed, the steps comprising:
- (a) introducing a hot vapor containing feed into a fractionation zone at a vapor containing feed location near one end of said fractionation zone;
- (b) removing liquid from a liquid collection zone below said one end of said fractionation zone;
- (c) passing said thus removed liquid through a heat extraction zone to extract heat from said liquid to produce cooled liquid;
- (d) returning a first portion of said thus cooled liquid to said fractionation zone as a first reflux liquid at a location intermediate the vapor containing feed location and the other end of said fractionation zone;
- and
- (e) returning a second portion of said thus cooled liquid to said fractionation zone as a quench liquid at a location intermediate the vapor containing feed location and the surface of the liquid in said liquid collection zone wherein said quench liquid is sprayed onto an inclined surface over which condensed liquid from said hot vapor containing feed passes from said fractionation zone and said vapor containing feed location to the surface of the liquid in said liquid collection zone to directly cool said condensed liquid.
Dependencies are inferred from the claim text.