Patent ID: 6517705
Filing Date: 2003-02-11
Classification: C10G

Abstract:
A process for hydrocracking a hydrocarbonaceous feedstock to produce lower boiling hydrocarbonaceous compounds which process comprises:(a) contacting the hydrocarbonaceous feedstock and 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) stripping the uncooled hydrocarbon effluent from the hydrocracking zone in a hot, high pressure stripping zone maintained at essentially the same pressure as the hydrocracking zone with a first hydrogen-rich gaseous stream to produce a first gaseous hydrocarbonaceous stream and a first liquid hydrocarbonaceous stream; (c) condensing at least a portion of the first gaseous hydrocarbonaceous stream and separating the same into a second liquid hydrocarbonaceous stream and a second hydrogen-rich gaseous stream; (d) recycling at least a portion of the second hydrogen-rich gaseous stream from step (c) to supply at least a portion of the hydrogen in step (a) and at least a portion of the first hydrogen-rich gaseous stream in step (b); and (e) stripping at least a portion of the first liquid hydrocarbonaceous stream to produce a third liquid hydrocarbonaceous stream comprising heavy lube base oil.