Abstract
Solubility of carbon dioxide (CO2) in two [Tf2N] based ionic liquids (ILs), [HOPMIm][Tf2N] and [DEME][Tf2N], was measured at (303.15, 323.15, and 343.15) K and at pressures up to 12 bar with a gravimetric microbalance. The densities of these ILs at the same range of temperatures were also measured. The Henry's law constants for the absorption of CO2 in these ionic liquids were estimated from the solubility data (P, T, x), and the enthalpy and entropy for the absorption of CO2 in these ILs at infinite dilution were also calculated from the estimated Henry’s law constants. The experimental solubility data were correlated with Peng-Robinson (PR) equation of state using the van der Waals two (vdW2, based on two binary interaction parameters) mixing rules. The model correlated the data with %AAD less than 2.
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