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Crossover Peng-Robinson equation of state with introduction of a new expression for the crossover function

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Title: Crossover Peng-Robinson equation of state with introduction of a new expression for the crossover function
Authors: Feyzi, F. feyzi@iust.ac.ir, Seydi, M.1, Alavi, F.1
Source: Fluid Phase Equilibria. Jun2010, Vol. 293 Issue 2, p251-260. 10p.
Subjects: Equations of state, Vapor-liquid equilibrium, Scaling laws (Statistical physics), Cubic equations, Mixtures, Thermodynamics, Critical point (Thermodynamics)
Abstract: Abstract: In this research, we use 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. [Copyright &y& Elsevier]
Copyright of Fluid Phase Equilibria is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Abstract: In this research, we use 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. [Copyright &y& Elsevier]
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  Data: <i>Copyright of Fluid Phase Equilibria is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.fluid.2010.03.032
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      – Code: eng
        Text: English
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        Type: general
      – SubjectFull: Vapor-liquid equilibrium
        Type: general
      – SubjectFull: Scaling laws (Statistical physics)
        Type: general
      – SubjectFull: Cubic equations
        Type: general
      – SubjectFull: Mixtures
        Type: general
      – SubjectFull: Thermodynamics
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      – SubjectFull: Critical point (Thermodynamics)
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      – TitleFull: Crossover Peng-Robinson equation of state with introduction of a new expression for the crossover function
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              Text: Jun2010
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