Abstract
A physicochemical model developed in earlier work for representing H 2 S and CO 2 solubility in aqueous solutions of monoethanolamine (MEA) and diethanolamine (DEA) was extended to include the mixtures of methyldiethanolamine (MDEA) with MEA or DEA. Activity coefficients are represented with the electrolyte-NRTL equation treating both long(range electrostatic interactions and short-range binary interactions. Adjustable binary interaction parameters of the model were fitted on binary and ternary system MDEA data reported in the literature. The solubility of CO 2 in aqueous mixtures of MDEA with MEA or DEA was measured at 40 and 80 o C over a wide range of CO 2 partial pressures. Representation of the data by the model is good, especially at low to moderate acid gas loadings
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