Intensification of mass transfer in sieve plate bubble columns

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Abstract
The effect was studied of gas distribution on the character of the gas-liquid mixture and its porosity in 0.15 and 0.30 m in diameter bubble reactors. The experiments covered a wide range of gas-liquid mixture height to reactor diameter ratios (2-18) with the superficial gas velocities ranging between 0.015 and 0.184 m/s. The gas was distributed by a sieve plate of 0.2 or 0.5% free area exhibiting various configurations of the openings. The obtained experimental evidence suggests that the degree of affecting the character of the bubble layer and its porosity through the design of the distributing plate varies in dependence on the size of the bubble layer. The effect was evaluated of the size of the bubbling layer and the plate free area on the porosity for uniformly bubbling columns. The nonlinear course of the experimentally found dependences of porosity on the superficial velocity of gas was fitted by a simple semi-empirical relation valid for the whole range of experimental conditions covered by experiments.