Thermodynamics of fluid mixtures near to and far from the critical region
Lue, L. and Prausnitz, J. M. (1998) Thermodynamics of fluid mixtures near to and far from the critical region. AIChE Journal, 44 (6). pp. 14551466. ISSN 00011541 (https://doi.org/10.1002/aic.690440622)
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A theory for an equation of state for simple fluid mixtures valid both near to and far from critical points is presented. The base equation of state obtained from integralequation theory using the meanspherical approximation is used to compute the contribution of shortwavelength fluctuations to the free energy of the fluid mixture. Wilson's phasespace cell approximation, as extended by White, is used to compute the contribution of longwavelength fluctuations.The resulting theory possesses nonclassic critical exponents similar to those observed experimentally. Far from the critical region, where longwavelength fluctuations are not important, the theory reduces to that corresponding to the base equation of state. The complete theory is used to represent the thermodynamic properties and phase behavior of binary mixtures of methane, carbon dioxide and nbutane.In the critical region, agreement with experiment is dramatically improved upon, adding to the base equation of state corrections from longwavelength fluctuations.


Item type: Article ID code: 38472 Dates: DateEventJune 1998PublishedNotes: English Article ZT298 AICHE J Subjects: Science > Chemistry
Science > Chemistry > Physical and theoretical chemistryDepartment: Faculty of Engineering > Chemical and Process Engineering Depositing user: Pure Administrator Date deposited: 13 Mar 2012 16:26 Last modified: 21 Feb 2024 14:23 URI: https://strathprints.strath.ac.uk/id/eprint/38472