Vapor–liquid equilibria of carbon dioxide with linoleic acid, α-tocopherol and triolein at elevated pressures

In this work an apparatus is described with which VLE equilibrium data for CO2+linoleicacid, CO2+α-tocopherol, and CO2+triolein over a wide range of pressures and temperatures are obtained. Liquid and vapor densities for these systems were separately measured using a system consisting of two vibrating tube densitometers. A P–x–y diagram of each system was determined at 313 K and 333 K, and pressures up to 24.21 MPa. Linoleic acid is the most soluble compound in CO2 at both temperatures and exhibits the greatest distribution coefficient. At constant temperature, the solubility of each compound in the vapor phase increased with increasing pressure.