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For pressure and temperature swing process, Qsen contributes 77.4 % to the total energy demand, and both Qdes and Qsen influence the total energy demand. Thus, it can be concluded that both Henry’s constant of CO2 in ILs and heat capacity of ILs are important factors to determine the energy demand for pressure and temperature swing process. Table 4.3. Energy demand for [bmim][Tf2N] regeneration in CO2 separation process. Option Qdes/kJ Pressure swing 14.07 Temperature swing 14.07 Qex/kJ Qsen /kJ -1.06 - -0.16 1258 Qtotal /kJ 13.01 1272 57.71 Pressure & Temperature swing 14.07 -1.03 44.67 4.1.4 CH4 solubility and properties of ILs In order to conduct the process simulation for CO2 separation, besides the CO2 solubility in ILs, the properties (e.g. density, viscosity, surface tension, heat capacity) of ILs and the solubility of other gas (e.g. CH4, N2, H2, CO) are required. Although a lot of ILs have been synthesized and the properties of ILs have been intensively studied, not all the required properties for each IL are available. In this work, the CO2 separation from biogas was chosen as a case study. Both the CO2 and CH4 solubilities are needed in order to evaluate the performance of ILs. However, the available experimental CH4 solubility in ILs is limited. Therefore, only three conventional ILs ([hmim][Tf2N], [bmim][Tf2N] and [bmim][PF6]) were chosen for further study owing to the available experimental data. All the experimental CH4 solubility was used without evaluation. The properties of ILs are also required in process simulation. The density, viscosity, surface tension and heat capacity of [hmim][Tf2N], [bmim][Tf2N] and [bmim][PF6] have been measured extensively at different temperatures and atmospheric pressure. The sources of these properties are summarized in Table 4.4. All the available experimental data from different sources is compared with each other for each property. It is found that the density and viscosity from different sources are consistent with each other, while the experimental surface tension and heat capacity of [hmim][Tf2N] and [bmim][PF6] from different sources show considerable discrepancies. The disparities may be due to the impurity of ILs. The 26PDF Image | CO2 Separation with Ionic Liquids
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