The effects of column dimensions, gas velocity and properties of the liquid and the solid particles on the gas holdup sG and the volumetric liquid-phase mass transfer coefficient kLa in a solid suspended bubble column with a draught tube and a conical bottom were studied experimentally in a liquid-solid batch operation. The presence of suspended solid particles in the column reduces the values of eG and kLa, and their reduction due to the addition of solid particles to the column increases with increasing solid concentration and terminal velocity of a single particle. Based on these observations, empirical equations for sG and kLa are proposed which are applicable to columns with diameter of 0.1-0.3 m.

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The gas holdup s and the volumetric liquid-phase mass transfer coefficient kLa were studied experimentally in a bubble column with a draught tube and with gas dispersion into the annulus. It has been shown that s and kLa increase with increasing gas velocity and frothing ability of liquid, while the dimensions of the column have a minor effect on s and kLa. Based on these observations, empirical equations for s and kLa are proposed which are applicable to columns with diameters of 0.1-0.3 m.It was shown also that at the same gas velocity the values of g and kLa in this column are larger than those in a bubble column without a draught tube, when a liquid with frothing ability is used.

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