ABSTRACT
The accurate prediction of phase equilibria for the biodiesel system is essential for the design and optimization of biodiesel production, separation and purification steps. The UNIQUAC and UNIFAC activity coefficient models were studied to predict the liquid-liquid equilibrium for biodiesel-methanol-glycerol at two different temperatures. The Newton’s forward iteration method was applied for the regression of interacting parameters which were fitted against the experimental data. The linear fit of the Hand and Bachman correction equation showed good consistency of the experimental data. The experimental and predicted data were compared and the root mean square deviations for both the models resulted within the deviation of 2% at 303.15 K and 323.15 K.
