Gas holdup and volumetric liquid-phase mass transfer coefficient in bubble column with draught tube and with gas dispersion into annulus

Abstract

The gas holdup ε 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 ε and kLa increase with increasing gas velocity and frothing ability of liquid, while the dimensions of the column have a minor effect on ε and kLa. Based on these observations, empirical equations for ε 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 ε 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. © 1983, The Society of Chemical Engineers, Japan. All rights reserved.