Decrease in Fluidization Quality by Mixing Two Types of Catalyst Particles

Abstract

When alumina and FCC catalysts were mixed, the fluidity of the mixture was significantly lowerthan that of each particle type alone. A significant amount of dried particles adhered to the inner wallof a column, and channeling was observed. The main cause of these phenomena was found to besymmetrical electrification due to mutual friction between the two types of particles. This causedagglomeration of particles and the decrease in the fluidization quality. Adding 4 wt% of water to thepores of the particles reduced the influence of the electrostatic force. Increasing the bed temperatureabove 523 K also improved the fluidity of the beds.