Fine particle coating in a circulating fluidized bed by rapid expansion of supercritical fluid solutions

Fine particle coating by the rapid expansion of supercritical CO2 solutions of paraffin was performed in a circulating fluidized bed of 50 mm i. d. with an internal nozzle at the center of the riser. Microspheroidal catalyst particles (average particle size 56 mu m) were used as the core particles. The coating mass and coating rates were measured by a sampling method. The effects of gas flow rate and solute concentration on coating rate and coating efficiency were examined.