Solubility of carbon dioxide and hydrogen sulfide in aqueous alkanolamines

The Deshmukh-Mather thermodynamic model has been fitted to all available, public, phase-equilibrium data for CO[sub 2] and H[sub 2]S in aqueous solutions of monoethanolamine, diethanolamine, diglycolamine, and N-methyldiethanolamine. The fitting was done for both acid gases simultaneously, and the best numerical values of the most important interaction parameters for each amine were obtained. Although the method used for data regression did not provide a statistical measure of the goodness of fit, the regressed model forms a unified basis for evaluating the large amount of data collected over the past 50 years and it results in a rational approach to performing vapor-liquid equilibrium calculations in a computationally affordable, thermodynamically sound manner.