Collect. Czech. Chem. Commun. 1989, 54, 3061-3068

Mass transfer rate from gas bubbles into liquid in presence of solid particles with strong adsorbing properties

Jan Kratochvíl and František Kaštánek

Institute of Chemical Process Fundamentals, Czechoslovak Academy of Sciences, 165 02 Prague 6-Suchdol


The presence of small particles with adsorbing activity (carbon soot, active carbon etc.) in the bubble bed augments the gas-liquid mass transfer coefficient kLa about approximately 20% in comparison with pure liquid. This fact can be explained by penetrating and disturbance effect of particles into the boundary layer of liquid near the interface. This activity is however reduced to small concentrations of particles (0.07% mass in the case of carbon soot, 0.5%-1.0% mass for active carbon particles). Addition of small amount of particles with adsorbing activity to the liquids containing superficial active agents (tensides) can partially overcome the negative effect of tensides on kLa value. The positive effect of particles of active carbon on kLa in bubble beds is less pronounced than that published for the case of mechanically agitated vessels.