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Measurement and prediction of high-pressure vapor-liquid equilibria for binary mixtures of carbon dioxide + n-octane, methanol, ethanol, and perfluorohexane |
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| Authors: | Katsumi Tochigi Tooru Namae Hiroyuki Matsuda M Carolina dos Ramos |
| Affiliation: | a Department of Materials and Applied Chemistry, Nihon University, 1-8 Surugadai, Kanda, Chiyoda-ku, Tokyo 101-8308, Japan b Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN 37235, USA c Department of Chemistry, Vanderbilt University, Nashville, TN 37235, USA |
| Abstract: | We report the measurement of high-pressure vapor-liquid equilibrium data for binary mixtures of carbon dioxide + n-octane, +methanol, and +ethanol systems at 313.14 K and carbon dioxide + perfluorohexane at 303.15-323.15 K. The experimental data were collected using a new simple apparatus for measuring high-pressure vapor-liquid equilibria and correlated using a modified SRK equation with the three-parameter conventional mixing rule proposed by Adachi and Sugie. The SAFT-VR equation of state has also been used to predict the phase behavior and found to be in good agreement with experimental data. For the carbon dioxide + methanol, carbon dioxide + ethanol and carbon dioxide + perfluorhexane systems simple Lorentz-Berthelot combining rules can be used to determine the cross interactions and predict the phase behavior. For the carbon dioxide + n-octane system cross interaction parameters fitted to experimental data are needed in order to capture the non-ideal phase behavior exhibited by this system. |
| Keywords: | Experimental data Vapor-liquid equilibria Modified SRK equation Adachi-Sugie mixing rule SAFT-VR Equation of state Carbon dioxide |
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