Patent ID: 7842180

Claim:
A process for hydrocracking a hydrocarbonaceous feedstock which comprises: (a) introducing a liquid phase stream comprising a hydrocarbonaceous feedstock, a liquid phase effluent from a hydrocracking zone, and a sufficiently low hydrogen concentration to maintain a liquid phase continuous system into a hydrotreating zone to produce hydrogen sulfide and ammonia and provide a first hydrocarbonaceous stream comprising hydrocarbons having a reduced level of sulfur and nitrogen; (b) passing an effluent stream from the hydrotreating zone to a heat exchanger to cool the effluent stream; (c) passing the cooled effluent stream to a vapor liquid separator to provide a first vapor stream comprising hydrogen sulfide and ammonia, and a second hydrocarbonaceous stream; (d) recovering unconverted hydrocarbons boiling in the range of the hydrocarbonaceous feedstock from the second hydrocarbonaceous stream; (e) introducing the unconverted hydrocarbons boiling in the range of the hydrocarbonaceous feedstock recovered in step (d) into the hydrocracking zone with a sufficiently low hydrogen concentration to maintain a liquid phase continuous system and (f) recovering hydrocracked hydrocarbons boiling in a temperature range lower than the hydrocarbonaceous feedstock.