The phase behavior of binary and ternary mixtures consisting of carbon dioxide (CO2) (1), acetone (2), and 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM]+[BF4]−) (3) was studied experimentally. A high-pressure view-cell technique was used to measure the solubility data in the solvent mixtures of acetone and [BMIM]+[BF4]− at various mole contents at temperatures of (298.2, 313.2 and 323.2) K and pressures up to 6.0 MPa. The experimental solubility data were correlated using the Henry’s law and Peng–Robinson equation of state (PR EOS), and the magnitude of Henry’s constants is in the order of H X 3=0.0 < H X 3=0.060 < H X 3=0.204 < H X 3=0.507 < H X 3=1.0 at a given temperature. Moreover, at a fixed mole ratio of organic solvent to ionic liquid (IL), the solubility of CO2 in the mixture of acetone and [BMIM]+[BF4]− is the highest when compared with other previously reported organic solvent + IL separating agents. The mixtures of acetone and [BMIM]+[BF4]− may be used as a potential solvent for industrial application for capturing CO2 efficiently and effectively.

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