Melting temperature depression caused by high pressure gases. Effect of the gas on organic substances and on ionic liquids |
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| Affiliation: | 1. University of La Serena, Faculty of Engineering, Department of Mechanical Engineering, P.O. Box 554, La Serena, Chile;2. Center for Technological Information (CIT), c/Monseñor Subercaseaux 667, La Serena, Chile;3. University of São Paulo, Engineering School of Lorena, Campus I, P.O. Box 116, Lorena, SP, Brazil;1. Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China;2. National Engineering Research Center for Coal & Gas Control, China University of Mining and Technology, Xuzhou 221116, China;3. School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China;1. College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou, 310014, China;2. College of Materials Science and Engineering, China Jiliang University, Hangzhou, 310018, China;1. School of Urban Planning and Municipal Engineering, Xi’an Polytechnic University, Xi’an 710048, China;2. School of Environment & Chemical Engineering, Xi’an Polytechnic University, Xi’an 710048, China;1. Department of Chemical Engineering, Faculty of Engineering, Fukuoka University, 8-19-1, Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan;2. Research Center of Composite Material, Fukuoka University, 8-19-1, Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan;3. Department of Neuropharmacology, Faculty of Pharmaceutical Sciences, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan;4. Department of Integrated Science and Technology, Faculty of Science and Technology, Oita University, Dannoharu, 700, Oita City 870-1192, Japan |
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| Abstract: | The effect on the melting temperature depression (MTD) of organic substances and ionic liquids caused by different types of pressurizing gases is analyzed. A high pressure gas produces a combined effect between solubility and pressure that causes the melting temperature to decrease. The authors have previously used phase equilibrium relations to correlate MTD of organic substances and ionic liquids under high pressure carbon dioxide, but other gases were not considered. The Peng–Robinson equation of state with the Wong–Sandler mixing rules showed to be appropriate for correlating the phase equilibrium in these high pressurized systems and is the model used is in this work. Three organic substances (naphthalene, biphenyl and octacosane) under high pressure produced by three gases (ethane, ethylene and carbon dioxide) for which experimental data on MTD are available were considered in this study. Then extension to an ionic liquid under high pressure carbon dioxide and high pressure ethylene was done. The proposed thermodynamic method and the model used show to have the necessary flexibility to acceptably correlate the MTD produced in these systems. |
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| Keywords: | Ionic liquids Melting temperature depression Equations of state Supercritical gases |
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