Patent ID: 6497810
Filing Date: 2002-12-24
Classification: C10G

Abstract:
A process for hydroprocessing a hydrocarbonaceous feedstream, which process comprises:a. introducing a portion of said feedstream into a reaction vessel upstream from at least one reaction zone and passing said feedstream through two or more reaction zones operated at hydroprocessing conditions, wherein each reaction zone contains a bed of hydroprocessing catalyst; b. introducing a hydrogen-containing treat gas at the bottom of said reaction vessel and passing it upward through at least one reaction zone countercurrent to the flow of liquid feedstream, thereby reacting with said feedstream in the presence of said hydroprocessing catalysts and resulting in a liquid phase product stream and a vapor phase product stream; c. passing the liquid phase product out of the bottom of said reaction vessel; d. removing the vapor phase product stream overhead of said reaction zones; and e. wherein the temperature of one or more of said reaction zones is isothermally controlled by introducing a fraction of said feedstream upstream of one or more of said reaction zones so that the temperature throughout the reaction vessel is substantially isothermal.