Patent ID: 6402935
Filing Date: 2002-06-11
Classification: C10G

Abstract:
A process for hydrocracking a hydrocarbonaceous feedstock which process comprises:(a) passing a hydrocarbonaceous feedstock, a liquid recycle stream and hydrogen to a denitrification and desulfurization reaction zone containing a catalyst and recovering a denitrification and desulfurization reaction zone effluent therefrom; (b) passing said denitrification and desulfurization reaction zone effluent to a hydrocracking zone containing hydrocracking catalyst; (c) passing a resulting effluent from said hydrocracking zone 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 said hydrocarbonaceous feedstock, hydrogen sulfide and ammonia, and a first liquid stream comprising hydrocarbonaceous compounds boiling in the range of said hydrocarbonaceous feedstock; (d) passing at least a portion of said first liquid stream comprising hydrocarbonaceous compounds boiling in the range of said hydrocarbonaceous feedstock as at least a portion of said liquid stream to said denitrification and desulfurization reaction zone; (e) heat-exchanging and partially condensing said first vapor stream with a first hydrogen-rich gaseous stream to produce a lower temperature stream comprising hydrogen and hydrocarbonaceous compounds and at least a portion of said hot, hydrogen-rich stripping gas in step (c); (f) passing said lower temperature stream comprising hydrogen and hydrocarbonaceous compounds from step (e) into an aromatic saturation zone to reduce the concentration of aromatic compounds; and (g) passing and cooling the resulting effluent from said aromatic saturation zone in step (f) and at least a portion of said first liquid stream from step (c) to a vapor-liquid separator to produce a second hydrogen-rich gaseous stream and a hydrocracked hydrocarbonaceous product stream.