Abstract
The hydrodynamic properties (residence time distribution and holdup), gas-liquid surfaced area and mass transfer coefficients for two foamed fixed beds are measured and compared with correlations proposed in the literature. Two foam materials, an Al2O3 foam of 20 ppi and a β-SiC foam of 7 ppi, were considered and experiments were performed in the trickle regime varying liquid and gas superficial velocities, in the ranges 0.001–0.005m/s and 0.045–0.079m/s, respectively.Residence time distributions were measured by the stimulus-response method using a pulse tracer. This technique provides information about the liquid hold-up and the flow pattern, including the degree of mixing. The deviations from ideal plug flow have been modelled using the dispersion model.The gas-liquid mass transfer and effective surface area have been studied using the method of Danckwerts, based on the reaction between CO2 and NaOH.
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