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releasing pressure and increasing temperature) were considered for CO2 separation. Based on the energy demand for solvent regeneration, a proper IL was screened for each option. Table 4.2 lists the parameters of absorber and desorber, and the screened ILs with their energy demand. Comparing the total energy demand for solvent regeneration with different options as listed in Table 4.2, the pressure swing process is considered to be the best choice because of the lowest energy demand. However, the compression work needs to be considered if the gas is compressed before entering the column. Therefore, more research work still needs to be done to investigate the energy demand for the entire CO2 separation process. Table 4.2. Energy demands for solvent regeneration with different options. Option Pressure swing Temperature swing Pressure & Temperature swing Absorber 298 K, 1 MPa 298 K, 0.1 MPa 298 K, 1 MPa Desorber 298 K, 0.1 MPa 323 K, 0.1 MPa 323 K, 0.1 MPa Promising IL [emim][EtSO4] [emim][PF6] [bmim][Tf2N] Qtotal (kJ/mol CO2) 9.840 888.9 57.71 Choosing [bmim][Tf2N] as a case study, the energy demands were further analysed for each option in order to investigate the contribution of each part (Qdes, Qex, Qsen) to the overall energy demand (Qtotal). The results are summarized in Table 4.3. In the pressure swing process, Qsen is zero. Qdes contributes mostly to the total energy demand, and the magnitude of Qex is only 7.2 % of Qdes. As Qdes is estimated from the Henry’s constant at different temperatures, the Henry’s constant of CO2 is the key factor to determine the energy demand in the pressure swing process. In the temperature swing process, the sensible enthalpy, relating to the heat capacities of ILs and CO2, needs to be accounted. Due to the high heat capacity of [bmim][Tf2N], Qsen contributes 98.8 % to the total energy demand. Therefore, the heat capacity of ILs is the key factor to determine the energy demand in the pressure swing process. It is expected that the ILs with low heat capacity should be chosen as liquid absorbents for CO2 separation from energy point of view. 25PDF Image | CO2 Separation with Ionic Liquids
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