Measurement and modeling of high-pressure (vapor + liquid) equilibria of (CO2 + alkanol) binary systems

Complementary isothermal (vapor + liquid) equilibria data are reported for the (CO2 + 3-methyl-2-butanol), (CO2 + 2-pentanol), and (CO2 + 3-pentanol) binary systems at temperatures of (313, 323, and 333) K, and at pressure range of (2 to 11) MPa. For all (CO2 + alcohol) systems, it was visually monitored that there was no liquid immiscibility at the temperatures and pressures studied. The experimental data were correlated with the Peng–Robinson equation of state using the quadratic mixing rules of van der Waals with two adjustable parameters. The calculated (vapor + liquid) equilibria compositions were found to be in good agreement with the experimental data with deviations for the mole fractions <8% and <2% for the liquid and vapor phase, respectively.

Research highlights
► (Vapor + liquid) equilibria of three (CO2 + C5 alcohol) binary systems were measured.
► Complementary data are reported at (313, 323 and 333) K and from (2 to 11) MPa.
► No liquid immiscibility was observed at the temperatures and pressures studied.
► Experimental data were correlated with the PR-EoS and the van de Waals mixing rules.
► Correlation results showed relative deviations ⩽8 % (liquid) and ⩽2 % (vapor).