Abstract
The solubility of carbon dioxide (CO2) in three protic ionic liquids, namely N-Ethylmorpholine acetate ([NEMH][Ac]), N-Ethylmorpholine propionate ([NEMH][Pro]), and Triethylamine propionate ([TEAH][Pro]), was measured at temperatures from 298.15 to 338.15 K and pressures up to about 900 kPa. The solubility data were fitted by Pitzer's model and Soave-Redlich-Kwong (SRK) cubic equation of state. In the range of experimental uncertainty, both models can well correlate solubility data. Henry's law constants of CO2 in these three protic ionic liquids at zero pressure were estimated from the solubility data, and the partial molar Gibbs free energy, partial molar enthalpy, and partial molar entropy at infinite dilution were calculated.
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