EXPERIMENTAL-STUDY OF THE ABSORPTION OF ACID GASES IN POROUS PARTICLES IMPREGNATED WITH AQUEOUS ALKANOLAMINE SOLUTIONS

In the present study the absorption behaviour and the equilibria of CO 2 and H2S in porous alpha-and gamma-alumina particles impregnated with inert solutions and alkanolamine solutions were investigated. From th e equilibrium data it could be concluded that for CO2 and H2S also ads orption on the internal surface of liquid filled gamma-alumina particl es occurs. The experimental absorption rate data were compared with th eoretical data obtained with an absorption model, which describes the mass transport accompanied by chemical reaction in porous particles im pregnated with reactive solutions. The CO2 and H2S alkanolamine data n ecessary for this model were taken from literature, while the tortuosi ty and porosity were experimentally determined. The model could descri be the experimentally observed absorption rates satisfactorily. Discre pancies mainly occurred for the process conditions where equilibrium w as approached. These deviations probably must be attributed to the cal culation of the equilibrium compositions (no correction for non-ideali ties) and the accuracy of the available thermodynamic data.