Patent ID: 6103104
Filing Date: 2000-08-15
Classification: C10G,C10L

Abstract:
A process for removing heteroatoms from middle distillate feedstreams having a first heteroatom amount, which process comprises:(a) hydrotreating said feedstream in a first temperature stage in the presence of a treat gas comprised of once-through hydrogen-containing treat gas and recycle treat gas from a downstream temperature stage wherein said first temperature stage contains a hydrotreating catalyst, said first temperature stage being operated at hydrotreating conditions that includes a temperatures in the range of about 360.degree. C. to about 450.degree. C., thereby producing a reaction product comprised of a liquid component and a vapor component;(b) quenching said reaction product to a temperature from about 260.degree. C. to about 350.degree. C;(c) separating the liquid component from said vapor component;(d) stripping said liquid component of dissolved gaseous material in a first stripping zone in order to provide the liquid component with a second heteroatom amount lower than the first heteroatom amount;(e) hydrotreating said stripped liquid component of step (d) in the second temperature stage, which reaction stage contains a hydrotreating catalyst and is operated in the presence of fresh hydrogen-containing gas, at hydrotreating conditions, which includes a temperature from about 260.degree. C. to about 350.degree. C., thereby resulting in a reaction product comprised of a liquid component and a vapor component;(f) separating said liquid component from said vapor component; and(g) stripping said liquid component of dissolved gaseous material in a second stripping zone.