Patent ID: 6387245
Filing Date: 2002-05-14
Classification: C10G

Abstract:
A process for hydrocracking a hydrocarbonaceous feedstock to produce lower boiling hydrocarbonaceous compounds which process comprises:(a) contacting the hydrocarbonaceous feedstock, a liquid recycle stream having a temperature greater than about 500Â° F. and saturated with hydrogen, and added hydrogen with a metal promoted hydrocracking catalyst in a hydrocracking zone at elevated temperature and pressure sufficient to obtain a substantial conversion to lower boiling hydrocarbons; (b) passing the hydrocracking zone effluent directly to a hot, high pressure stripper utilizing a hot, hydrogen-rich stripping gas to produce a first vapor stream comprising hydrogen, hydrocarbonaceous compounds boiling at a temperature below the boiling range of the hydrocarbonaceous feedstock, hydrogen sulfide and ammonia, and a downwardly flowing liquid comprising hydrocarbonaceous compounds boiling in the range of the hydrocarbonaceous feedstock; (c) simultaneously contacting the downwardly flowing liquid in the hot, high pressure stripper with a hydrotreating catalyst and an upwardly flowing hydrogen stream to produce a first liquid stream comprising hydrocarbonaceous compounds boiling in the range of the hydrocarbonaceous feedstock; (d) passing at least a portion of the first liquid stream comprising hydrocarbonaceous compounds boiling in the range of the hydrocarbonaceous feedstock to the hydrocracking zone operating at a temperature from about 400Â° F. to about 900Â° F., a pressure from about 500 psig to about 2500 psig and a liquid hourly space velocity from about 0.1 hrâˆ’1 to about 15 hrâˆ’1; (e) condensing at least a portion of the first vapor stream comprising hydrogen, hydrocarbonaceous compounds boiling at a temperature below the boiling range of the hydrocarbonaceous feedstock, hydrogen sulfide and ammonia to produce a second liquid stream comprising hydrocarbonaceous compounds boiling at a temperature below the boiling range of the hydrocarbonaceous feedstock and a second vapor stream comprising hydrogen and hydrogen sulfide; and (f) passing at least a portion of the second vapor stream to the hydrocracking zone.