Patent ID: 6623623
Filing Date: 2003-09-23
Classification: C10G

Abstract:
A process for the simultaneous hydroprocessing of two feedstocks having different boiling ranges which process comprises:(a) passing a first hydrocarbonaceous feedstock and hydrogen to a denitrification and desulfurization reaction zone containing a hydrotreating catalyst and operating at a temperature of about 400Â° F. to about 900Â° F., a pressure from about 500 psig to about 2500 psig, a liquid hourly space velocity from about 0.1 hrâˆ’1 to about 15 hrâˆ’1 and recovering a denitrification and desulfurization reaction zone effluent therefrom; (b) passing the denitrification and desulfurization reaction zone effluent directly to a hot, high pressure stripper utilizing a hot, hydrogen-rich stripping gas to produce a first vapor stream comprising hydrogen, hydrogen sulfide, ammonia and hydrocarbonaceous compounds and a first liquid stream comprising hydrocarbonaceous compounds boiling in the range of the first hydrocarbonaceous feedstock; (c) passing at least a portion of the first liquid stream comprising hydrocarbonaceous compounds boiling in the range of the first hydrocarbonaceous feedstock to a hydrocracking zone containing a hydrocracking catalyst and operating at a temperature of about 400Â° F. to about 900Â° F., a pressure from about 500 psig to about 2500 psig, a liquid hourly space velocity from about 0.1 hrâˆ’1 to about 15 hrâˆ’1 and recovering a hydrocracking zone effluent therefrom; (d) passing the hydrocracking zone effluent directly to the hot, high pressure stripper to produce a second vapor stream comprising lower boiling hydrocarbonaceous compounds and a second liquid stream; (e) passing at least a portion of the first vapor stream recovered in step (b) and at least a portion of the second vapor stream recovered in step (d) to a post-treat hydrogenation reaction zone; (f) condensing at least a portion of the resulting effluent from the post-treat hydrogenation zone to produce a third liquid stream comprising hydrocarbonaceous compounds boiling at a temperature below the first hydrocarbonaceous feedstock and a third vapor stream comprising hydrogen and hydrogen sulfide; (g) passing a second hydrocarbonaceous feedstock having a lower average boiling point than that of the first hydrocarbonaceous feedstock into an upper end of the hot-high pressure stripper to serve as reflux; (h) passing at least a portion of the third vapor stream to the hydrocracking zone; (i) passing at least a portion of the third vapor stream to the denitrification and desulfurization reaction zone; and (j) passing at least a portion of the third vapor stream to the hot, high pressure stripper.