MULTI-PHASE COUNTERCURRENT HYDRODEWAXING PROCESS

摘要

A process technique is provided for catalytic hydrodewaxing of heavy petroleum feedstock or the like in a multi-phase catalytic reaction zone containing at least one fixed porous bed of solid catalyst particles which process comprises introducing the heavy feedstock predominately in liquid phase under superatmospheric process conditions at elevated temperature and distributing the feedstock uniformly over the catalyst bed for downward flow in contact with the catalyst; introducing a pressurized reactant gas rich in hydrogen blow the catalyst bed at a rate to establish countercurrent contact dispersed in downcoming liquid; converting a portion of heavy petroleum hydrocarbons by selective cracking thereof to produce a treated liquid product and olefinic byproducts; controlling olefin concentration in the liquid phase by stripping with reactant gas in a lower portion of the catalyst bed thereby enhancing catalyst activity; disengaging upwardly flowing dispersed gas from feedstock above the catalyst bed; and recovering treated petroleum and offgas.