Calculation of critical lines of hydrocarbon/water systems by extrapolating mixing rules fitted to subcritical equilibrium data |
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| Institution: | 1. Department of Chemical Engineering, Minghsin University of Science and Technology, Hsin-Fong, Hsinchu 304, Taiwan, ROC;2. Department of Chemical Engineering, National Tsing Hua University, Hsinchu 300, Taiwan, ROC;1. Center for Energy and Environmental Research, National Tsing Hua University, Hsinchu 30013, Taiwan;2. Department of Chemical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan;1. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, China;2. Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;1. Physical Chemistry Department, University of Tabriz, Tabriz, Iran;2. Department of Organic and Bioorganic Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz 51664, Iran;1. Laboratory of Polymer Materials, Eindhoven University of Technology, Den Dolech 2, 5600MB Eindhoven, The Netherlands;2. Dutch Polymer Institute (DPI), P.O. Box 902, 5600AX Eindhoven, The Netherlands;3. Department of Biobased Materials, Maastricht University, P.O. Box 616, 6200MD Maastricht, The Netherlands;4. Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, North Zhongshan Road 3663, 200062 Shanghai, PR China;5. Department of Materials, Loughborough University, England, UK |
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| Abstract: | The phase behavior of water/hydrocarbon mixtures in a wide range of pressures is important for various applications ranging from reservoir engineering to environmental engineering. In this work, mutual solubility and critical loci of hydrocarbon/water systems are calculated using the Peng–Robinson–Stryjek–Vera cubic equation of state with four mixing rules: (1) van der Waals mixing rules with one binary interaction parameter (vdW-1), (2) van der Waals mixing rules with asymmetric composition dependent binary interaction parameter (vdW-A), (3) Wong–Sandler mixing rules (WS) and (4) second-order modified Huron–Vidal mixing rules (MHV2). It was found that the parameters obtained from correlating liquid–liquid equilibria using different mixing rules would lead to prediction of completely different forms of critical behavior. Unusual branches of critical loci were found with WS and MHV2 mixing rules. Therefore, equation of states models must be used with extreme caution when applied for predicting phase behavior over wide ranges of temperatures and pressures. |
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