CORRELATION AND PREDICTION OF THE SOLUBILITY OF CO2 AND H2S IN AN AQUEOUS-SOLUTION OF METHYLDIETHANOLAMINE AND SULFOLANE

The Clegg-Pitzer equations with some simplifications are used to corre late the vapor-liquid equilibrium data for the CO2-methyldiethanolamin e-sulfolane-H2O and H2S-methyldiethanolamine-sulfolane-H2O systems. Th e interaction parameters determined from data for the binary, ternary, and quaternary systems can be used to predict the quinary mixed solve nt system without any additional parameters. The model is applied to t he CO2-H2S-methyldiethanol-amine-sulfolane-H2O system containing three neutral solvents (methyldiethanolamine, sulfolane, and H2O), two neut ral solutes (CO2 and H2S), and three ionic species (MDEAH(+), HCO3-, a nd HS-) with three main chemical equilibria simultaneously involved.