Hydrotreating a heavy hydrocarbon oil in an ebullated catalyst zone and a fixed catalyst zone

Abstract

Abstract A process is shown for the hydrotreating of a heavy hydrocarbon feed in an ebullated-bed reaction zone and the fixed bed hydrotreating of a vacuum gas-oil fraction of the liquid product from the ebullated-bed reaction zone. The process comprises: treating the heavy hydrocarbon feed at high pressures above 1,700 p.s.i.g. and temperatures above 750* F. with hydrogen in the presence of the ebullated catalyst bed; withdrawing the treated liquid hydrocarbon from the reaction zone; reducing the pressure of said withdrawn liquid to 1,500 p.s.i. to flash off a hydrocarbon vapor stream containing hydrogen leaving a reduced pressure liquid hydrocarbon stream; fractionating the reduced pressure liquid stream to obtain a gas-oil fraction containing sulfur; and contacting the gas-oil fraction with the reduced pressure hydrocarbon vapor stream in the presence of a fixed bed of hydrotreating catalyst in a second reaction zone maintained at 1,500 p.s.i.g. to thereby hydrotreat the gas-oil fraction.

Inventors

• 👤 William R Mounce
• 👤 Roger P Van Driesen

Bibliographic Details