Abstract
The water impact on the CO2 and CH4 solubilities and their selectivity in [C4C1im][Ac] was evaluated for [C4C1im][Ac]:H2O molar ratios of 5:1, 2:1, 1:1, and 1:2, for temperatures ranging from (293 to 363) K and pressures up to 70 MPa. In addition, density and excess molar volumes of [C4C1im][Ac] + water binary systems were measured aiming at understanding the impact of the solvent structure on the gas solubilities. Water is shown to improve the IL capability to solubilize CO2, with equimolar molar ratios leading to enhanced solubilities for pressures up to 5 MPa, whereas [C4C1im][Ac]:H2O molar ratios of 5:1 and 2:1 present higher CO2 solubility at higher pressures. The impact of water on the solubility of methane, on the other hand, is small, with only a slight enhancement of methane solubility at high pressures observed. The favorable impact of water, on the carbon dioxide solubility, lead to enhanced CO2/CH4 ideal selectivity.
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