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raw biogas was 2.397 gd/m3, which was almost the same with the literature. Based on this, we can conclude that our calculation is reliable. Therefore, ΔGDP was calculated for the biogas upgrading using different absorbents. The results are illustrated in Figure 13. In general, ΔGDP was higher than zero for the process using aqueous ChCl/Urea (1:2) as absorbents, and it reached the highest value (512 gd/h) for the process with the absorbent of 50 wt. % ChCl/Urea (1:2), indicating that this process is the most environmentally benign. In addition, compared to the water scrubbing process (i.e. ChCl/Urea (1:2) = 0), ΔGDP for the process with aqueous ChCl/Urea (1:2) was always higher, which means that the process with aqueous ChCl/Urea (1:2) is more environmentally benign than HPWS. Figure 13. The green degree of biogas upgrading with aqueous ChCl/Urea (1:2) 4. CONCLUSION A conceptual process for biogas upgrading was developed in which aqueous ChCl/Urea (1:2) was chosen as the liquid absorbent. To perform process simulation based on Aspen Plus, the experimental physical properties and vapor-liquid equilibrium were surveyed, evaluated and then fitted to the empirical equations or models embedded in the software Aspen Plus. Based on the fitted parameters and mixing rules in Aspen Plus, the properties of vapor pressure, density, viscosity and molar heat capacity of binary system H2O-ChCl/Urea (1:2) were predicted. The prediction showed a good agreement with the experimental data. Process simulation of biogas upgrading was conducted and verified with HWPS. The sensitivity analysis was used to determine the optimal L/G ratio, Nab, pflash and AFR/G for each absorbent. The effects of ChCl/Urea (1:2) content on the total energy utilization, green degree of process, and the diameters and pressure drop of absorber and desorber were further studied. Based on the systematic analysis, aqueous ChCl/Urea (1:2) is a promising absorbent. The total energy utilization was decreased by 20 % where the total electrical power was decreased by 27 %. Using aqueous ChCl/Urea (1:2) as absorbents is more environment-friendly compared to HPWS and the content of 50 wt. % ChCl/Urea (1:2) showed the highest green degree of process. The diameters of both absorber and desorber decreased with the increasing content of ChCl/Urea (1:2). The pressure drop was clearly increased in the absorber but still within the recommended value. 21PDF Image | CO2 Separation with Ionic Liquids
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