Patent ID: 6106694
Filing Date: 2000-08-22
Classification: C10G

Abstract:
A process for hydrocracking a hydrocarbonaceous feedstock which process comprises:(a) passing a hydrocarbonaceous feedstock, a hydrocracking zone effluent and hydrogen to a denitrification and desulfurization reaction zone at reaction zone conditions including a temperature from about 400.degree. F. to about 900.degree. F., a pressure from about 500 psig to about 2500 psig, and a liquid hourly space velocity of said hydrocarbonaceous feedstock from about 0.1 hr.sup.-1 to about 10 hr.sup.-1 with a catalyst and recovering a denitrification and desulfurization reaction zone effluent therefrom;(b) passing said denitrification and desulfurization reaction zone effluent directly to a hot, high pressure stripper operated at a pressure which is essentially equal to that of said denitrification and desulfurization reaction zone and 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;(c) passing at least a portion of said first liquid stream comprising hydrocarbonaceous compounds boiling in the range of said hydrocarbonaceous feedstock and hydrogen to a hydrocracking zone containing a hydrocracking catalyst and operated at a temperature of about 400.degree. F. to about 900.degree. F., a pressure from about 500 psig to about 2500 psig and a liquid hourly space velocity from about 0.1 hr.sup.-1 to about 15 hr.sup.-1 and recovering a hydrocracking zone effluent therefrom;(d) passing said hydrocracking zone effluent to said denitrification and desulfurization reaction zone; and(e) recovering at least a portion of said hydrocarbonaceous compounds boiling at a temperature below the boiling range of said hydrocarbonaceous feedstock from step (b).