New isothermal vapor–liquid equilibria for the CO2 + n-nonane, and CO2 + n-undecane systems

Experimental vapor–liquid equilibria (VLE) for the CO2 + n-nonane and CO2 + n-undecane systems were obtained by using a 100-cm3 high-pressure titanium cell up to 20 MPa at four temperatures (315, 344, 373, and 418 K). The apparatus is based on the static-analytic method; which allows fast determination of the coexistence curve. For the CO2 + n-nonane system, good agreement was found between the experimental data and those reported in literature. No literature data were available for the CO2 + n-undecane system at high temperature and pressure. Experimental data were correlated with the Peng–Robinson equation of state using the classical and the Wong–Sandler mixing rules.