Cubic crossover equation of state

In this paper we develop a cubic crossover equation of state for pure fluids which incorporates the scaling laws asymptotically close to the critical point and is transformed into the original classical cubic equation of state far away from the critical point. We use the modified Patel–Teja (PT) cub...

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Bibliographic Details
Published in:Fluid phase equilibria 1998-06, Vol.147 (1), p.7-23
Main Author: Kiselev, S.B.
Format: Article
Language:English
Subjects:
Carbon dioxide
Chemistry
Critical state
Cubic equation of state
Exact sciences and technology
General and physical chemistry
Liquid-vapor equilibria
Phase equilibria
R125
R32
Vapor–liquid equilibria
Water
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Summary:In this paper we develop a cubic crossover equation of state for pure fluids which incorporates the scaling laws asymptotically close to the critical point and is transformed into the original classical cubic equation of state far away from the critical point. We use the modified Patel–Teja (PT) cubic equation of state as a starting point. A comparison is made with experimental data for pure CO 2, water, and refrigerants R32 and R125 in the one- and two-phase regions. We show that the crossover Patel–Teja equation of state yields a much better representation of the thermodynamic properties of pure fluids, especially in the critical region and for vapor–liquid equilibrium, than the original PT equation of state.
ISSN:0378-3812
1879-0224
DOI:10.1016/S0378-3812(98)00222-2