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The mole fractions of CO2 and CH4 in the liquid phase, at a constant temperature and pressure, were used to calculate the selectivity (eq. 18). (18) The ideal selectivity was calculated for comparison. As shown in Fig. 7, the predicted CO2/CH4 selectivities were much lower than the ideal selectivities at pressures less than 1 MPa. When the pressure was in the range of 1.5 to 1.8 MPa, the selectivities were quite close to each other. Generally, biogas upgrading is operated at a pressure less than 1MPa. Consequently, based on the model predictions, the ideal selectivity is not accurate enough for process simulations. Therefore, it is necessary to measure the mixed-gas solubilities to further verify the model predictions. Figure 7. CO2/CH4 selectivity in dry [Amim][HCOO] at 313.2 K and at different pressures. , ideal selectivity; , selectivity calculated from the solubility of a CO2/CH4 mixture. 4. Conclusions In this work, a thermodynamic study was carried out to investigate the [Amim][HCOO] as a liquid sorbent for CO2 separation. The density and viscosity of dry and aqueous [Amim][HCOO] were measured at temperatures ranging from 293.15 to 333.15 K, at atmospheric pressure. It was found that both the density and viscosity decreased with increasing temperature and water concentration, and only small amounts of water decreased the viscosity of [Amim][HCOO] significantly. The solubilities of CO2 and CH4 in dry [Amim][HCOO] and the solubility of CO2 in aqueous [Amim][HCOO] were measured at pressures up to 1.8 MPa and at temperatures of 298.2, 313.2 and 333.2 K, respectively. Moreover, it was found that the CO2 solubility in aqueousPDF Image | CO2 Separation with Ionic Liquids
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