Journal
JOURNAL OF SUPERCRITICAL FLUIDS
Volume 55, Issue 2, Pages 682-689Publisher
ELSEVIER
DOI: 10.1016/j.supflu.2010.10.016
Keywords
Experimental data; Vapor-liquid equilibria; Modified SRK equation; Adachi-Sugie mixing rule; SAFT-VR; Equation of state; Carbon dioxide
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We report the measurement of high-pressure vapor-liquid equilibrium data for binary mixtures of carbon dioxide + n-octane, +methanol, and +ethanol systems at 313.14K and carbon dioxide + perfluorohexane at 303.15-323.15K. 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. (C) 2010 Elsevier B.V. All rights reserved.
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