Patent ID: 6190535
Filing Date: 2001-02-20
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 an indirect heat exchange zone to remove heat therefrom;(c) passing the resulting cooled denitrification and desulfurization reaction zone effluent to a hydrocracking zone containing hydrocracking catalyst;(d) 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;(e) 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 recycle stream to said denitrification and desulfurization reaction zone;(f) condensing at least a portion of said first vapor stream to produce a second liquid stream comprising hydrocarbonaceous compounds boiling at a temperature below the boiling range of said hydrocarbonaceous feedstock and a second vapor stream comprising hydrogen and hydrogen sulfide;(g) introducing at least a portion of said second vapor stream to said indirect heat exchange zone;(h) removing a resulting heated second vapor stream from said indirect heat exchange zone to provide at least a portion of said hot, hydrogen-rich stripping gas of step (d); and(i) recovering said second liquid stream produced in step (f).