CALCULATION OF PHASE-EQUILIBRIUM IN SUPERCRITICAL EXTRACTION OF C54 TRIGLYCERIDE (RAPESEED OIL)

High-pressure phase equilibria have been calculated for systems of C54 triglyceride (rapeseed oil) + propane + carbon dioxide and C54 trigly ceride (rapeseed oil) + ethanol + carbon dioxide, in the temperature r ange of 313-353 K and at pressures of 60-120 bar. The Peng-Robinson eq uation of state with a conventional mixing rule involving two paramete rs (2PCMR) was used, The critical parameters of triglycerides have bee n estimated by predictive and extrapolative methods using very limited pure-component data, The available experimental phase-equilibrium dat a for the binary systems were well correlated with the 2PCMR model, At pressures lower than 80 bar, the predicted ternary phase equilibria a re in good agreement with measurements. At higher pressures, a simulta neous correlation of binary and ternary phase-equilibrium data was nec essary to improve the calculated ternary phase diagrams.