An apparatus for hydrodesulfurizing residual hydrocarbon oils in a substantially liquid phase continuous process wherein catalyst is periodically introduced at the top of the reactor and spent catalyst is periodically withdrawn from the bottom thereof, said apparatus comprising at least one high-pressure reaction vessel containing a catalyst bed and having an inlet for introducing residual oil and hydrogen, an outlet for withdrawing reaction products and being connected by conduits and valves to a high-pressure vessel from which fresh catalyst can be introduced to the top of said catalyst bed and to a high-pressure vessel into which spent catalyst can be discharged from the bottom of said catalyst bed.
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