In the present paper, a systematic investigation of the influence of amine and salt concentration on the CO 2 absorption capacity (m CO 2 , moles of CO 2 absorbed by 1 kg of a solution) and amine efficiency (c CO 2 , moles of CO 2 absorbed by 1 mole of amine) of the ternary mixtures composed of monoethanolamine (MEA), ethylene glycol (EG), and choline chloride (ChCl) was carried out. We demonstrate that, in general, the presence of a fixed amount of ChCl in a mixed {MEA + EG} solvent cannot improve m CO 2 over an entire range of solvent composition and weakly decreases c CO 2 with the effect more pronounced for the mixtures containing greater amount of MEA. The influence of ChCl concentration on the above properties was analyzed for the mixtures with a fixed MEA/EG mole ratio but various ChCl concentrations. It was shown that a decrease in m CO 2 observed with an increase in ChCl, again, is rather caused by an overall decrease in MEA content in a mixture as its efficiency c CO 2 does not change when ChCl concentration increases. In addition, properties such as density (ρ) and viscosity (η) of the binary {MEA + EG} and ternary {MEA + EG + ChCl} mixtures were obtained within a wide range of temperatures for both neat and CO 2 -loaded samples. We show that regardless of the {MEA + EG} mixed solvent composition, the presence of ChCl increases both ρ and η. For CO 2loaded samples, both properties increase significantly with a greater contribution for the mixtures containing greater amount of MEA.

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