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The expanded bed height has been investigated in a 0.14-m diameter mobile-bed gas-liquid contactor. The data obtained by two methods of measurement show that the bed height varies linearly with the gas flow rate and is independent of the packing density. The operation of the bed is characterized by the condition of flooding. Correlations are presented for the expanded bed height and the minimum fluidization velocity in terms of the independent system variables.obile-bed contacting is a technique of counter-

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The overall pressure drop and the vertical static pressure profile in a 0.14‐m. diameter mobile‐bed contactor have been investigated for two packing sizes and three packing heights. The gas and liquid flow rates were the two other variables studied. Foam polystyrene spheres were used as packings. The relationship between the static pressure and vertical position of the bed was found to be linear. A correlation of the drag parameter with Gg, Gt and Lp is presented. States of fully‐mobile bed operation are discussed.

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