Fluidized beds are commercially utilized in gas‐solid contacting processes such as the fluid catalytic cracking (FCC) process. Attempts have been made for bubbling fluidized beds to enhance the gas exchange between the bubble phase and the emulsion phase as well as to increase bubble holdup. Low‐density superfine particles 5070S were selected with average diameters of about 10 μm. Unlike agglomerate particulate fluidization of superfine particles on which other researchers have reported, the smaller bubbles, whose diameter is less than 10 mm, uniformly dispersed in the whole bed. Additionally, the gas exchange rate with 5070S became larger than with the FCC particles. Such a unique gas‐solid behavior is probably due to the proper density difference between particle aggregate and fluidizing gas.

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