Hydrocarbon conversion with gravity-flowing catalyst particles

Abstract From the Canadian patent

A multiple-stage catalytic conversion system in which a hydrocarbonaceous charge stock and hydrogen flow serially through a plurality of catalytic reaction zones in each of which the catalyst particles are movable via gravity-flow. The reaction product effluent from each zone in admixture with added hydrogen is heated prior to the introduction thereof into the succeeding reaction zone. The disclosed technique alleviates problems associated with the occurrence of stagnant catalyst areas as a result of catalyst particles being "pinned" within the reaction zone and thus unable to assume a downward gravity-flow pattern. In addition the technique allows utilization of excess heater capacities …