Volume-translated Peng-Robinson equation

Foster A., Rarey J., Ramjugernath D., An improved group contribution volume translated Peng-Robinson equation of state - VGTPR, available at www.ddbst.eom/files/files/Durban/SACEC2009-Foster-VGTPR Poster.pdf,... 

Ahlers, J. Gmehling, J. (2001). Development of an universal group contribution equation of state. I. Prediction of liquid densities for pure compounds with a volume translated Peng-Robinson equation of state. Fluid Phase EcjuiUb., Vol.191, pp. 177 -188... 

Equation of state Soave-Redlich-Kwong Volume-translated Peng-Robinson... 

Calculate the enthalpy of reaction for the ammonia synthesis at 450 C and a pressure of 600 atm using the value of the standard enthalpy of reaction at 450 °C in the ideal gas state calculated in Example 12.1. For the calculation of the residual enthalpies, the group contribution equation of state volume-translated Peng-Robinson (VTPR) should be applied. The required VTPR parameters are given in Appendix K. 

This work presents a temperature-dependent volume translated model for Peng-Robinson equation of state (PR EOS) for calculating liquid densities of pure compounds and mixtures in the saturated region. For pure compounds, the average absolute percent deviation (AAPD) were calculated in the reduced temperature range of (0.3-0.99). Similarly for mixtures, the (AAPD) of different binary, ternary and multicomponent mixtures were determined. The AAPD for 29 pure compounds and different mixtures(binary, ternary and multicomponents) were 1.29 and 1.35 respectively. The accuracy of this model was compared well with three well-known liquid density correlations and other earlier volume translated models. 

Figure 7 Temperature-density plot for water at constant pressure (253.31 bar) calculated from various equations of state. HSVTvdW is the hard-sphere, volume-translated van der Waals equation of state developed by Kutney et al. (Reprinted from Ref. 48). Other equations of state shown PR = Peng-Robinson, VTPR = volume translated PR, RKS = Redlich-Kwong-Soave, VTRKS = volume-translated RKS...

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