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pabsorber/pdesorber MPa pflash MPa Tabsorber/Tdesorber K Plant capacity m3∙h-1 Air flow rate m3∙h-1 0.8/0.1 0.3 293.15/293.15 242.3 (STP) 515.2 (STP) * Only for the case of HPWS-based biogas upgrading 3.3. Process simulation of biogas upgrading with aqueous ChCl/Urea (1:2). The conceptual process for biogas upgrading using aqueous ChCl/Urea (1:2) solutions was simulated with the model parameters obtained from the HPWS process. The plant capacity and the working pressure were set as those from literature49, 50 (Table 5). Considering H2S existed in biogas may affect the performance of ChCl/Urea (1:2), it was removed before entering the biogas upgrading process. In addition, H2 is also not considered in the following study. Therefore, the raw biogas only contains 53.69 % CH4, 45.19 % CO2, 0.93 % N2, and 0.19 % O2. Generally, the solvent with high viscosity requires high pumping costs and leads to high pressure drops in the absorber. The addition of water can overcome the problems caused by the high viscosity of solvent. Based on the results depicted in Figure 2, when the water content is 30 wt. %, the viscosity of the solvent decreases greatly from 513 to 6 mPa.s at 303.15 K, making the solvent suitable for the process operation in practice. Therefore, the solvent considered in this work for process simulation was the aqueous solutions with the water content higher than 30 wt. %. The addition of the water will affect both the CO2 solubility and selectivity. According to the regressed parameters in this work, we calculated the solubility of CO2 and CH4 in the gas mixture (54 % CH4, 46 % CO2) in aqueous ChCl/Urea (1:2) at 293.15 K and 0.8 MPa (i.e. under the operational conditions of absorption). The selectivity (S) for CH4 and CO2 can be calculated with eq 14. S XCO2 (mol CO2 /mol solvent) / XCH4 (mol CH4 /mol solvent) (14) where XCO2 and XCH4 are the solubility of CO2 and CH4 in aqueous ChCl/Urea (1:2), respectively. Figure 9. Selectivity between CH4 and CO2, and the CO2 solubility in ChCl/Urea (1:2)-H2O system at 293.15 K. As we can see from Figure 9, with the increasing content of ChCl/Urea (1:2), the selectivity of 15PDF Image | CO2 Separation with Ionic Liquids
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