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

Abstract

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 relative u 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 critical P C - T C curve data. Based on the derived values of the critical parameters of CO 2 + 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.