VLE property measurements and PC-SAFT/ CP- PC-SAFT/ E-PPR78 modeling of the CO₂ + n-tetradecane mixture

This paper presents a new experimental VLE property data in the binary system of carbon dioxide – n-tetradecane at three selected isotherms of 313.15 K, 333.15 K, and 353.15 K in the pressure range from (3.8 to 19.0) MPa. The measurements were made using a high-temperature and high-pressure optical cell. The standard absolute u and relativeu_r uncertainties of temperature, pressure, concentration measurements are: u(T)=7.5 mK; u_r(P)=0.00025; u_r(x)=0.015; and u_r(y)=0.015. The measured VLE data were used to determine the criticalP_C-T_C curve data. Based on the derived values of the critical parameters of CO₂+n-tetradecane mixture the value (-67.58 MPa) of the Krichevskii parameter has been determined. The predictive capabilities of the perturbed chain-statistical associating fluid theory (PC-SAFT), the critical point-based modification of PC-SAFT (CP-PC-SAFT), and the Enhanced-Predictive-Peng-Robinson-78 (E-PPR78) models were examined.