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Equation of state representation of aqueous mixtures using an association model
Author(s) -
Shinta Ali A.,
Firoozabadi Abbas
Publication year - 1995
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450730314
Subject(s) - compressibility , thermodynamics , saturation (graph theory) , aqueous solution , equation of state , phase equilibrium , chemistry , association (psychology) , phase (matter) , materials science , mathematics , organic chemistry , physics , philosophy , epistemology , combinatorics
A previously proposed association equation of state (AEOS) (Anderko, 1991) for aqueous mixtures is modified to extend its applicability to a wider range of temperatures and pressures. In the AEOS, the compressibility factor is subdivided into two parts; physical and chemical. The physical part, in this work, is represented by the Peng‐Robinson (PR) (1976a) EOS for nonpolar compounds. Other cubic EOS can be used for this purpose with little effect on results. The chemical part is expressed by an empirical association model. The improved association model enables the AEOS to reproduce accurately the total compressibility of pure liquid water along the saturation line. Incorporation of the new association model in the PR‐EOS allows the combined model to calculate accurately the phase behavior of water/hydrocarbons and water/nonhydrocarbons in VLE, LLE, and VLLE regions.