Phase Equilibrium Measurements of Sacha Inchi Oil (<i>Plukenetia volubilis</i>) and CO₂ at High Pressures

Abstract

Abstract New data on phase equilibria for Sacha inchi seed oil in carbon dioxide have been measured using a variable volume cell phase equilibria system at temperatures of 303, 313 and 323 K and at pressures ranging from 4.3 to 27.7 MPa. The CO 2 mole fraction varied from 0.7488 to 0.9997. At the studied concentrations, phase transitions of vapor‐liquid, liquid‐liquid‐vapor and liquid‐liquid were observed. Sacha inchi oil contains 47% of omega‐3 fatty acids, with a ratio of 0.76:1 for omega‐6:omega‐3, which is good for human health. The Peng‐Robinson equation of state was used to describe the experimental data. A qualitative agreement was obtained between experimental and calculated data for the binary system CO 2 and Sacha inchi seed oil.