UNIQUE PROPERTIES OF 30-MU-M PARTICLES AS THE CATALYST OF FLUIDIZED-BED REACTORS

The collapse properties of three kinds of fine particles (19, 30, and 59 mu m) are studied with a new type of bed-collapse technique, ''isol ated dilute-phase bed collapse,'' to determine the dense-phase propert ies under high superficial gas velocities. The properties of the emuls ion and bubble phases are investigated by a video camera. The influenc e of particle size on particle collapse properties is also discussed W hen gas velocities are high the 30- mu m particles take the longest to collapse, have the smallest emulsion density, and have largest bubble volumetric fraction. These observations; indicate that the 30- mu m p articles have a property that the others lack.