volume-translated Peng–Robinson for hydrocarbons at high pressures and temperatures
This equation was developed from the Peng–Robinson EOS by using Peneloux' volume translation for improving the representation of liquid densities. In contrast to most other translation schemes, the translation depends here on temperature.
The amount of the volume translation is determined from the critical temperature, the acentric factor, and the molar mass by means of an empirical correlation function, optimized for hydrocarbons at high pressures. The EOS should not be used for other classes of substances! Consequently, the EOS gives good density results for hydrocarbons. But the volume shift is usually not appropriate for the critical region. The critical compression factor is usually off, and it is not advisable to use the critical molar volume for parameter fitting.
adjustable parameters: 3
 H. Baled, R. M. Enick, Y. Wu, M. A. McHugh, W. Burgess, D. Tapriyal, and B. D. Morreale, Fluid Phase Equilib. 317 (2012) 65–76.
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