Patent ID: 7449102
Filing Date: 2008-11-11
Classification: C10G

Abstract:
1. An integrated process for the production of ultra-low sulfur diesel from low quality feedstocks which process comprises: (a) reacting an asphaltene-containing feedstock having at least a portion boiling at greater than 565° C. (1050° F.) and hydrogen in a hydrodesulfurization reaction zone containing hydrodesulfurization catalyst to produce a hydrodesulfurization reaction zone effluent stream comprising diesel boiling range hydrocarbons and having a reduced concentration of sulfur, and hydrogen; (b) separating the hydrodesulfurization reaction zone effluent stream to provide a vaporous stream comprising both diesel boiling range hydrocarbons and hydrogen, and a liquid hydrocarbonaceous stream comprising asphaltenes and having a reduced concentration of sulfur; (c) reacting the vaporous stream comprising diesel boiling range hydrocarbons and hydrogen from step (b) and a distillate hydrocarbon feedstock in a hydrocracking zone containing hydrocracking catalyst to produce a hydrocracking zone effluent stream comprising lower boiling hydrocarbons, diesel boiling range hydrocarbons having a reduced sulfur concentration, and hydrogen; and (d) separating the hydrocracking zone effluent stream comprising lower boiling hydrocarbons, diesel boiling range hydrocarbons having a reduced sulfur concentration, and hydrogen to provide a hydrogen rich gaseous stream and diesel boiling range hydrocarbons having a reduced concentration of sulfur.