High-pressure phase equilibria and densities of the binary mixtures carbon dioxide—oleic acid, carbon dioxide—methyl myristate, and carbon dioxide—methyl palmitate and of the ternary mixture carbon dioxide—methyl myristate—methyl palmitate

Abstract

Densities and thermodynamic equilibrium compositions of both the gas and the liquid phases were determined for binary mixtures of carbon dioxide and oleic acid, methyl myristate, and methyl palmitate, and for the ternary system carbon dioxide—methyl myristate—methyl palmitate at pressures up to 130 bar. Binary equilibria and densities were measured at 40°C, 50°C, and 60°C; the ternary system was studied at 40°C and 50°C. High-pressure densities were also recorded for all pure components. The apparatus used for the experiments consisted of a high-pressure view cell through which both phases were recirculated. Compositions were determined from samples taken with the help of six-way valves. Densities were measured with a vibrating sensor tube. Solubilities increase with pressure at a given temperature; however, the separation of a mixture of methyl myristate and methyl palmitate becomes less selective. All numerical values are given in full detail.