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Received September 27, 2004
Accepted February 14, 2005
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Prediction of the Infinite-dilution Partial Molar Volumes of Organic Solutes in Supercritical Carbon Dioxide Using the Kirkwood-Buff Fluctuation Integral with the Hard Sphere Expansion (HSE) Theory
Department of Chemical Engineering, Kangwon National University, Kangwon-do 200-701, Korea
Korean Journal of Chemical Engineering, May 2005, 22(3), 452-456(5), 10.1007/BF02719425
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Abstract
Two thermodynamic models were used to predict the infinite dilution partial molar volumes (PMVs) of organic solutes in supercritical carbon dioxide: (1) the Kirkwood Buff fluctuation integral with the hard sphere expansion (HSE) theory incorporated (KB-HSE fluctuation integral method) and (2) the Peng-Robinson equation of state with the classical mixing rule. While an equation of state only for pure supercritical carbon dioxide is needed in the KB-HSE fluctuation integral model, and thus, there is no need to know the critical properties of solutes, two molecular parameters (one size parameter σ12 and one dimensionless parameter α12) in the KB-HSE fluctuation integral model are determined to fit the experimental data published on the infinite dilution PMVs of solutes. The KB-HSE fluctuation integral method produced better results on the infinite dilution PMVs of eight organic solutes tested in this work than the Peng-Robinson equation of state with the classical mixing rule.
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