Vapor–liquid equilibrium for the ternary carbon dioxide–ethanol–nonane and decane systems

In this work, experimental vapor–liquid equilibrium (T, p, xi, yi) data for the ternary carbon dioxide–ethanol–nonane and carbon dioxide–ethanol–decane systems are reported in the temperature range of 313–373 K from low pressures to the nearest of the corresponding critical pressure. Measurements were performed in an apparatus based on the static-analytic method with an on-line ROLSI sampler-injector device. Vapor–liquid equilibrium (VLE) data for both ternary systems are predicted using the Peng–Robinson equation of state coupled to the Wong–Sandler, one parameter van der Waals and two parameters van der Waals mixing rules. Binary interaction parameters are obtained from the VLE data of binary mixtures reported in the literature.

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► Equilibrium (p, T, xi, yi) data is reported for ternary systems.
► VLE for CO2–ethanol–nonane, and decane were measured from 313 to 373 K.
► Separation factors for ethanol over decane are higher than ethanol over nonane.