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Modeling, simulation and evaluation of biogas upgrading using aqueous choline chloride/urea Chunyan Ma,†,‡ Yujiao Xie,‡ Xiaoyan Ji,*,‡ Chang Liu,*,†, Xiaohua Lu† † State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, China ‡ Energy Engineering, Division of Energy Science, Luleå University of Technology, Luleå 97187, Sweden ABSTRACT: Biogas has been considered as an alternative renewable energy, and raw biogas needs to be purified. In this work, the conceptual process for biogas upgrading using aqueous choline chloride (ChCl) / urea (1:2 on a molar basis) was developed, simulated and evaluated with Aspen Plus. In order to carry out the process simulation, the thermophysical properties of ChCl/Urea (1:2) and its aqueous solutions as well as the phase equilibrium of gas-ChCl/Urea (1:2), ChCl/Urea (1:2)-H2O and gas-ChCl/Urea (1:2)-H2O were surveyed, evaluated and then fitted to the models embedded into Aspen Plus. The properties needed but without available experimental results were predicted theoretically. The equilibrium approach was used for process simulation based on Aspen Plus. Sensitivity analysis was conducted to determine the optimal values of the flowrate ratio of total solvent volume to biogas (L/G), the flowrate ratio of the air to biogas (AFR/G), the number of theoretical stages of absorber (Nab), and the pressure of flash tank (pflash). With a set of operational conditions, the effects of ChCl/Urea (1:2) content on the total energy utilization, the diameters and pressure drops of absorber and desorber as well as the green degree of the process were studied. The simulation results showed that, with the addition of ChCl/Urea (1:2), the total electrical power decreased by 27 % compared to the process with pure water, the diameters of both absorber and desorber decreased with increasing content of ChCl/Urea (1:2). The green degree of the biogas upgrading with aqueous ChCl/Urea was higher than the high pressure water scrubbing, and it reached the highest for the solutions with 50 wt. % ChCl/Urea (1:2). Therefore, aqueous ChCl/Urea (1:2) is a promising solvent for biogas upgrading. Keywords: biogas upgrading, aqueous choline chloride/urea, process simulation, high pressure water scrubbing 1. INTRODUCTION Biogas produced by anaerobic digestion of biological wastes has been considered as an alternative renewable energy resource.1, 2 Generally, biogas contains 53-70 % (by volume) methane (CH4), 30-47 % carbon dioxide (CO2), small amounts of hydrogen sulfide (H2S, 0-10000 ppm) and other compounds.3 CO2, as the main impurity of biogas, has to be removed in order to increase the heating value, decrease 1PDF Image | CO2 Separation with Ionic Liquids
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