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Table 8. The parameters for Henry’s constant. In [Amim][HCOO] CO2 CH4 In water CO2 CH4 In aqueous [Amim][HCOO] CO2 B1 8.1910 10.054 B1 156.90 181.48 A0,1 -8.407 B2 -2286.4 -1765.2 B2 -8477.7 -9111.7 A0,2 0.02070 B3 B4 - - - - B3 B4 -21.957 0.00578 -25.038 0.00014 A1,1 A1,2 -27.77 Component j mij mji [Amim][HCOO] -10.408 20.540 [Amim][HCOO] -5.5831 13.770 [Amim][HCOO] -19.480 4966.8 -16.235 3422.9 Table 9. The NRTL binary interaction parameters. -0.1188 Component i CO2 CH4 H2O nij nji cij= cji 0.2 0.2 0.2 0.2 0.1 CO2 H2O 10.064 10.064 -3268.1 -3268.1 CO2 CH4 17.023 -7.3085 8.7759 67.012 2101.6 -4417.0 177.98 -1786.0 Fig. 5 shows the Henry’s constant of CO2 in aqueous [Amim][HCOO] IL. For the physical absorption of CO2 in the sorbent, Henry’s constant plays an important role in modelling. Generally, ideal mixing rules are used to describe the Henry’s constant of a gas in a mixed solvent, especially when Aspen Plus is used for modelling and simulation. For the mixed solvents without ILs, the ideal mixing rules are enough. However, due to generally strong interaction between water and ILs, the Henry’s constant of aqueous ILs gave rise to the differences that cannot be modeled with the available mixing rules without adjustable parameters. This phenomenon was also observed by Kumelan et al. [23] in case of the mixture of (water + [bmim][CH3SO4]). In addition, the preliminary investigation with the ideal mixing rule for the Henry’s constant gave rise to unacceptable modeling results (large deviations) for the gas solubility in aqueous [Amim][HCOO] IL. Therefore, an adjustment of the Henry’s constant of CO2 in an aqueous IL (e.g. [Amim][HCOO]) is essential.PDF Image | CO2 Separation with Ionic Liquids
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