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:: Crossover Peng-Robinson equation of state with introduction of a new ::

  Fluid Phase Equilibria 293 (2010) 251–260

  Crossover Peng-Robinson equation of state with introduction of a new

  expression for the crossover function

  F. Feyzi ∗ , M. Seydi, F. Alavi

 

  Thermodynamics Research Laboratory, School of Chemical Engineering, Iran University of Science and Technology, Tehran 16846, Iran

  a b s t r a c t

  In this research,weuse the original Peng-Robinson (PR) equation of state (EOS) for pure fluids and develop

  a crossover cubic equation of state which incorporates the scaling laws asymptotically close to the critical

  point and it is transformed into the original cubic equation of state far away from the critical point. The

  modified EOS is transformed to ideal gas EOS in the limit of zero density. A new formulation for the

  crossover function is introduced in this work. The new crossover function ensures more accurate change

  from the singular behavior of fluids inside the regular classical behavior outside the critical region. The

  crossover PR (CPR) EOS is applied to describe thermodynamic properties of pure fluids (normal alkanes

  from methane to n-hexane, carbon dioxide, hydrogen sulfide and R125). It is shown that over wide ranges

  of state, the CPR EOS yields the thermodynamic properties of fluids with much more accuracy than the

  original PR EOS. The CPR EOS is then used for mixtures by introducing mixing rules for the pure component

  parameters. Higher accuracy is observed in comparison with the classical PR EOS in the mixture critical

  region.

  Crown Copyright © 2010 Published by Elsevier B.V. All rights reserved.

  Keywords: Equation of state; SAFT-VR; Sutherland potential; Vapor–liquid equilibrium

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