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This paper explores the arguments for using solubility parameters and the regular solution theory for modeling gas solubilities in five different room-temperature ionic liquids (RTILs) at low partial pressures (<1 atm) and low mole fractions (<0.1). The experimentally measured and reported carbon dioxide (CO 2 ) solubilities at low mole fractions (<0.05) suggest positive deviations from Raoult's law for CO 2 /RTIL solutions. These CO 2 solubility deviations from Raoult's law indicate that CO 2 /RTIL complexations are not the sole controlling factor in relative CO 2 solubilities. The RTILs' energies of vaporization and molar volumes appear to be factors in determining relative CO 2 solubilities between RTILs. The energies of vaporization for the RTILs were empirically estimated from their melting points.
Scovazzo et al. (Wed,) studied this question.