Abstract
In this work, the simultaneous absorption of CO2 and H2S into aqueous solutions of DEA is studied theoretically and experimentally. The effect of contact time, amine concentration and temperature on the rate of absorption and the selectivity were studied by absorption experiments in a wetted wall column. The diffusion-reaction processes for CO2 and H2S mass transfer into aqueous DEA are modeled according to Higbie's penetration theory with the assumption that all reactions are reversible. The pseudo-first-order rate constant of the reaction between CO2 and DEA was obtained by adjusting the value of rate constant in the mathematical model and correlated. Model predicted results have been found to be in good agreement with the experimental results of rates of absorption of CO2 and H2S into (DEA+H2O).
