Three-parameter corresponding-states correlations for Joule-Thomson inversion curves

Tn the present work, the Lee-Kesler (LK) and Boublik-Alder-Chen-Kreglewski (BACK) equations of state were used to compute Joule-Thomson inversion curv es for nonsimple fluids. Comparisons with available data showed that predic tions were quite reliable and could be used in place of experimental values . Two sets of corresponding-stares correlations were developed, giving redu ced inversion pressures and densities as functions of reduced temperature a nd acentric factor. The LK-based correlations are valid for T(r)less than o r equal to 4.0, giving an average absolute deviation (AAD) of 4.5 % for pre ssures. The BACK-based correlations ale valid up to the maximum inversion t emperature and give a 6.7% AAD for pressures. Respective volume AADs are 12 .0 and 8.0% in the high-density region.