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A thermodynamic study of aqueous [Amim][HCOO] ionic liquid as a tailored sorbent for CO2 separation Yujiao Xie1*, Dilip Govind Raut2, Rakesh Samikannu2, Jyri-Pekka Mikkola2,3, Xiaoyan Ji1* 1Division of Energy Science, Luleå University of Technology, 97187 Luleå, Sweden 2Chemical-Biological Centre, Technical Chemistry, Department of Chemistry, Umeå University, Umeå, Sweden 3Johan Gadolin Process Chemistry Centre, Laboratory of Industrial Chemistry and Reaction Engineering, Åbo Akademi University, 20500, Turku-Åbo, Finland Abstract In this work, aqueous [Amim][HCOO] was studied as a potential sorbent for CO2 separation. The density and viscosity of the aqueous [Amim][HCOO] were measured at temperatures ranging from 293.15 to 333.15 K, at atmospheric pressure. The solubility of CO2 and CH4 in dry [Amim][HCOO] as well as the CO2 solubility in aqueous [Amim][HCOO] were measured at pressures up to 1.8 MPa and temperatures of 298.2, 313.2 and 333.2 K. The results showed that the density and viscosity of aqueous [Amim][HCOO] as well as the CO2 solubility in aqueous [Amim][HCOO] decreases with increasing water concentration and temperature. Also, the viscosity was very sensitive to the water concentration. The experimental density and viscosity of aqueous [Amim][HCOO] were fitted to the semi-empirical equations, and the excess molar volume and viscosity deviations were calculated to investigate the interaction between the [Amim][HCOO] ionic liquid and water. The experimental vapor-liquid equilibrium was represented with the Non-Random Two-Liquid and Redlich-Kwong (NRTL-RK) model. The model parameters can be further implemented into Aspen Plus software to conduct process simulations for CO2 separation. Keywords: aqueous [Amim][HCOO], property, gas solubility, thermodynamic modeling 1. Introduction CO2 emissions have been recognized as an important contributing factor to global warming and climate change. It has been perceived that there will be a rise of 1.9-3.5 °C in the global temperature by the year 2100 and an increase in the mean sea level of 18-30 cm – both issues that will be accompanied with many anticipated distresses [1]. Thus, the CO2 emissions have to be controlled and reduced. CO2 capture and storage or utilization is considered as the most promisingPDF Image | CO2 Separation with Ionic Liquids
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