Patent ID: 7041211
Filing Date: 2006-05-09
Classification: C10G

Abstract:
1. A process for hydrocracking a hydrocarbonaceous feedstock which process comprises: (a) passing a hydrocarbonaceous feedstock and hydrogen to a denitrification and desulfurization reaction zone at reaction zone conditions including a temperature from about 204° C. (400° F.) to about 482° C. (900° F.), a pressure from about 3.5 MPa (500 psig) to about 17.3 MPa (2500 psig), a liquid hourly space velocity of the hydrocarbonaceous feedstock from about 0.1 hr−1 to about 10 hr−1, with a catalyst, and recovering a denitrification and desulfurization reaction zone effluent therefrom; (b) passing the denitrification and desulfurization reaction zone effluent to a hot, high pressure stripper utilizing a hot, hydrogen-rich stripping gas to produce a first liquid stream comprising hydrocarbonaceous compounds boiling in the range of the hydrocarbonaceous feedstock and a first vapor stream comprising hydrogen, hydrogen sulfide and ammonia; (c) passing at least a portion of the first liquid stream comprising hydrocarbonaceous compounds boiling in the range of the hydrocarbonaceous feedstock to a hydrocracking zone containing a hydrocracking catalyst and operating at a temperature from about 204° C. (400° F.) to about 482° C. (900° F.), a pressure from about 3.5 MPa (500 psig) to about 17.3 MPa (2500 psig), a liquid hourly space velocity from about 0.1 hr−1 to about 15 hr−1; and recovering a hydrocracking zone effluent therefrom; (d) passing the hydrocracking zone effluent directly to the hot, high pressure stripper; (e) passing at least a portion of the first vapor stream produced in step (b) and at least a portion of the hydrocracking zone effluent to a post-treat hydrogenation reaction zone to saturate aromatic compounds; (f) condensing at least a portion of a resulting effluent from the post-treat hydrogenation reaction zone to produce a second liquid stream comprising hydrocarbonaceous compounds boiling at a temperature below the boiling range of the hydrocarbonaceous feedstock and a second vapor stream comprising hydrogen and hydrogen sulfide; (g) recycling at least a first portion of the second vapor stream to the hydrocracking zone; (h) recycling at least a second portion of the second vapor stream to the denitrification and desulfurization reaction zone; (i) recycling at least a third portion of the second vapor stream to the hot, high pressure stripper; and (j) recovering the hydrocarbonaceous compounds boiling at a temperature below the boiling range of the hydrocarbonaceous feedstock.