초록

An effective hydrotreating process is provided to minimize precipitation of asphaltenic solids in the product oil. In the preferred process, an aromatic diluent, preferably comprising decanted oil, is injected into one or more of the fractionators downstream of the reactor.

대표청구항 ▼

A hydrotreating process, comprising the steps of: feeding hydrogen-rich gases and a feedstock comprising a resid oil to a reactor train comprising a series of three ebullated bed reactors; conveying a hydrotreating catalyst to said reactor train; ebullating said hydrogen-rich gases and resid oil tog

A hydrotreating process, comprising the steps of: feeding hydrogen-rich gases and a feedstock comprising a resid oil to a reactor train comprising a series of three ebullated bed reactors; conveying a hydrotreating catalyst to said reactor train; ebullating said hydrogen-rich gases and resid oil together in the presence of said hydrotreating catalyst in said ebullated bed reactors to produce hydrotreated oil containing asphaltenic solids; conveying said hydrotreated oil to a separator; separating said hydrotreated oil in said separator into a low solid stream of light hydrotreated oil containing a lesser concentration of said asphaltenic solids than said influent conveyed hydrotreated oil, and a solids-enriched stream of heavy hydrotreated oil containing a greater concentration of said asphaltenic solids than said influent conveyed hydrotreated oil; decreasing the pressure of said solids-enriched stream; conveying said solids-enriched decreased pressure stream to fractionators comprising an atmospheric tower and a vacuum tower; separating said solids-enriched stream in said atmospheric tower into at least one atmospheric stream of distillate, an atmospheric stream of gas oil, and an effluent stream of atmospheric resid oil containing a greater concentration of said asphaltenic solids than said solids-enriched stream; conveying said atmospheric resid oil to said vacuum tower; separating said atmospheric resid oil in said vacuum tower into at least one vacuum stream of gas oil and a bottom stream of vacuum resid oil; and reducing the precipitation of asphaltenic solids in said fractionators and concurrently decreasing the concentration of asphaltenic solids in the resid oil discharged from said fractionators by injecting decanted oil into at least one of said fractionators.