Determination of mass transfer coefficients in agitated gas—liquid reactors by instantaneous rection

Abstract

A model was developed for the determination of volumetric mass transfer coefficients which combines pentration theory with instantaneous reaction. The two major criteria to be met are that the reaction is instantaneous compared to the diffusion and that the gas-film resistance is negligible. By maintaining the concentrations of the two reactants in the proper ratio, the first of these criteria can be met, while the second is met based on literature values for the gas-side mass transfer coefficient. The model was experimentally verified using a reaction between ozone and indigo disulfonate. Additionally, a dual technique is introduced which uses a reacting system followed by a dynamic absorption. After the liquid-phase reactant is depleted, the accumulation of the absorbing gas is tracked. The two methods can then be compared under identical mixing conditions.