Low-pressure solubilities and thermodynamics of solvation of eight gases in 1-butyl-3-methylimidazolium hexafluorophosphate |
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| Affiliation: | 1. Lehrstuhl für Technische Thermodynamik, RWTH Aachen University, 52056 Aachen, Germany;2. Lehrstuhl für Thermodynamik, TU Dortmund, Emil-Figge-Str. 70, 44227 Dortmund, Germany;1. CICECO – Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal;2. Center of Research in Ionic Liquids, Department of Chemical Engineering, Universiti Teknologi PETRONAS, Tronoh 31750, Perak, Malaysia;3. CIEPQPF, Departamento de Engenharia Química, FCTUC, University of Coimbra, Rua Sílvio Lima, Pôlo II—Pinhal de Marrocos, 3030-790 Coimbra, Portugal;4. Alya Technology & Innovation, Centre de Promoció Empresarial, C/Tres Creus, 236, 08203 Sabadell, Barcelona, Spain;5. MATGAS Research Center, Campus UAB, Bellaterra, 08193, Barcelona, Spain;6. IQS School of Engineering, Universitat Ramon Llull, Via Augusta, 390, 08017 Barcelona, Spain;1. Institute of Technical Thermodynamics, University of Rostock, Albert-Einstein-Str. 2, D-18059 Rostock, Germany;2. Department of Heat Energy, Azerbaijan Technical University, H. Javid Avn. 25, AZ1073 Baku, Azerbaijan;3. Departamento de QuímicaFísica, Facultad de Ciencias, Universidad de Zaragoza, 50009 Zaragoza, Spain;4. Physical and Organic Chemistry Department, Dagestan State University, Makhachkala, Russian Federation;5. Geothermal Research Institute, Russian Academy of Sciences, Makhachkala, Russian Federation;1. Laboratory of Engineering Thermodynamics (LTD), Technische Universität Kaiserslautern, Erwin-Schrödinger-Straße 44, Kaiserslautern 67663, Germany;2. BASF SE RCP/CF, Ludwigshafen 67056, Germany |
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| Abstract: | Experimental values for the solubility of carbon dioxide, ethane, methane, oxygen, nitrogen, hydrogen, argon and carbon monoxide in 1-butyl-3-methylimidazolium hexafluorophosphate, [bmim][PF6] – a room temperature ionic liquid – are reported as a function of temperature between 283 and 343 K and at pressures close to atmospheric. Carbon dioxide is the most soluble and hydrogen is the least soluble of the gases studied with mole fraction solubilities of the order of 10−2 and 10−4, respectively. All the mole fraction solubilities decrease with temperature except for hydrogen for which a maximum is observed at temperatures close to 310 K. From the variation of solubility, expressed as Henry's law constants, with temperature, the partial molar thermodynamic functions of solvation such as the standard Gibbs energy, the enthalpy, and the entropy are calculated. The precision of the experimental data, considered as the average absolute deviation of the Henry's law constants from appropriate smoothing equations, is better than ±1%. |
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