Three-Parameter Corresponding-States Correlations for Joule–Thomson Inversion Curves

In the present work, the Lee-Kesler (LK) and Boublik-Alder-Chen-Kreglewski (BACK) equations of state were used to compute Joule-Thomson inversion curves for nonsimple fluids. Comparisons with available data showed that predictions were quite reliable and could be used in place of experimental values. Two sets of corresponding-states correlations were developed, giving reduced inversion pressures and densities as functions of reduced temperature and acentric factor. The LK-based correlations are valid for Tr<4.0, giving an average absolute deviation (AAD) of 4.5% for pressures. The BACK-based correlations are valid up to the maximum inversion temperature and give a 6.7% AAD for pressures. Respective volume AADs are 12.0 and 8.0% in the high-density region.