The effects of alcohols, column dimensions, gas velocity, physical properties of liquids, and gel particles on the gas holdup
εG and the volumetric liquid-phase mass transfer coefficient
kLa in a gel-particle-suspended bubble column under liquid-solid batch operation were studied experimentally. It was shown that addition of alcohols to water generally increases
εG. However,
kLa values in aqueous solutions of alcohols became larger or smaller than those in water, according to the kind and concentration of the alcohol added to water. It was also shown that the presence of suspended gel-particles in the bubble column reduces values of
εG and
kLa. Based on these observations, empirical equations for
εG in the transition regime in an ethanol solution, for
εG in the heterogeneous flow regime applicable to various alcohol solutions and for
kLa in both flow regimes were proposed.
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