Abstract
To design ionic liquids (ILs) as effective liquid absorbents for CO 2 separation from flue or synthesis gases, it is necessary to know the properties and phase equilibria of the CO 2/IL systems. The molar volumes of CO 2/IL mixtures are predicted with the heterosegmented statistical associating fluid theory equation of state. The comparison with the available experimental data shows that the model can be used to predict reliably the molar volumes of CO 2/IL mixtures from 293 to 413 K and pressures up to 160 bar. In addition, the partial molar volume of CO 2 in CO 2/IL mixtures and the partial molar volume of CO 2 at infinite dilution in an IL are also predicted.
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