Hydrotreating of heavy hydrocarbon oils with control of particle size of particulate additives

Abstract From the Canadian patent

A process is described for controlling the size of additive or catalyst particles mixed with heavy hydrocarbon oil feedstock containing asphaltenes and metals and being subjected to hydrotreating. A slurry feed of a mixture of the heavy hydrocarbon oil feedstock and coke-inhibiting additive particles or catalyst particles is passed upwardly through a confined vertical hydrotreating zone in the presence of hydrogen gas while removing from the , top of the hydrotreating zone a mixed effluent containing a gaseous phase comprising hydrogen and vaporous hydrocarbon and a liquid phase comprising heavy hydrocarbon. The mixed effluent is passed through a separation vessel while withdrawing …