Collect. Czech. Chem. Commun. 1982, 47, 262-276

Hydrodynamics and mass transfer in uniformly aerated bubble column reactors

Jindřich Zahradník, František Kaštánek and Jan Kratochvíl

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


Condirions of stable, uniform gas distribution were studied in bubble-type reactors with sieve plates and the effect of geometric parameters of distributing plates and physical properties of liquid phase on the character of the uniformly bubbled bed and on its porosity was considered. Critical velocity in the holes of the plate corresponding to the onset of stable performance of distributing plates has been found to be a function of hole diameter and physical properties of phases. A simple semiempirical relation for the estimate of ranges of stability of sieve plates has been verified on basis of experimental data. Under the conditions of stable uniform gas distribution two differing bubbling regimes were observed in all studied gas-liquid systems. In the region of homogeneous bubbling regime the gas holdup has been at comparable conditions in all cases significantly greater than in the turbulent regime. Experimental data of volumetric liquid-side mass transfer coefficient kLa have demonstrated suitability of the homogeneous bubbling regime for obtaining an intensive interphase contact in the bubbled bed.