Patent ID: 6702935
Filing Date: 2004-03-09
Classification: C10G

Abstract:
An integrated hydroconversion process having at least two stages, each stage possessing at least one reaction zone, comprising:(a) combining a first refinery stream with a first hydrogen-rich gaseous stream to form a first feedstock; (b) passing the first feedstock to a reaction zone of the first stage, which is maintained at conditions sufficient to effect a boiling range conversion, to form a first reaction zone effluent comprising normally liquid phase components and normally gaseous phase components; (c) passing the first reaction zone effluent of step (b) to a heat exchanger or series of exchangers, where it exchanges heat with a second refinery stream; (d) combining the first reaction zone effluent of step (b) with the second refinery stream of step (c) to form a second feedstock; (e) passing the second feedstock of step (d) to a reaction zone of the second stage, which is maintained at conditions sufficient for converting at least a portion of the aromatics present in the second refinery stream, to form a second reaction zone effluent; (f) separating the second reaction zone effluent of step (e) into a liquid stream comprising products and a second hydrogen-rich gaseous stream; (g) recycling at least a portion of the second hydrogen-rich gaseous stream of step (f) to a reaction zone of the first stage; and (h) passing the liquid stream comprising products of step (f) to a fractionation column, wherein product streams comprise gas or naphtha stream removed overhead, one or more middle distillate streams, and a bottoms stream suitable for further processing.