Journal of Chemical Thermodynamics, Vol.42, No.5, 591-596, 2010
Measurement and modeling of high-pressure (vapour plus liquid) equilibria of (CO2 + alcohol) binary systems
An apparatus based on a static-analytic method assembled in this work was utilized to perform high pressure (vapour + liquid) equilibria measurements with uncertainties estimated at <5%. Complementary isothermal (vapour + liquid) equilibria results are reported for the (CO2 + 1-propanol), (CO2 + 2-methyl-1-propanol), (CO2 + 3-methyl-1-butanol), and (CO2 + 1-pentanol) binary systems at temperatures of (313, 323, and 333) K, and at pressure range of (2 to 12) MPa. For all the (CO2 + alcohol) systems, it was visually monitored to insure that there was no liquid immiscibility at the temperatures and pressures studied. The experimental results were correlated with the Peng-Robinson equation of state using the quadratic mixing rules of van der Waals with two adjustable parameters. The calculated (vapour + liquid) equilibria compositions were found to be in good agreement with the experimental values with deviations for the mol fractions <0.12 and <0.05 for the liquid and vapour phase, respectively. (C) 2009 Elsevier Ltd. All rights reserved.
Keywords:Experimental values;Peng-Robinson;(Vapour plus liquid) equilibria;Carbon dioxide;3-Methyl-1-butanol;2-Methyl-1-propanol;1-Pentanol;1-Propanol