Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

This work reports experimental phase equilibrium (transition points) data for the systems CO2 + ethyl acetate, CO2 + ethyl acetate + a-carotene, and CO2 + ethanol + a-carotene at different concentrations of a-carotene in the organic (liquid) solvents. For this purpose, the static synthetic method, using a variable-volume view cell, was employed for obtaining the experimental data in the temperature range from (303 to 343) K and pressures up to 12 MPa. Vapor-liquid phase transitions were observed as bubble and dew points for all overall compositions investigated. In a general sense, it was experimentally observed that the addition of a-carotene leads to negligible changes in pressure transition values compared to CO2 + solvent systems. The Peng-Robinson equation of state, with the classical van der Waals quadratic mixing rule, was employed for the thermodynamic modeling of the systems investigated with a satisfactory agreement between experiment and theory. It was also observed that the interaction parameters of a-carotene/organic solvent and a-carotene/CO2 need not be considered for efficient prediction of phase behavior of the ternary systems.