Liquid-liquid equilibria for ethyl esters + ethanol + water systems: Experimental measurements and CPA EoS modeling

► Water washing of biodiesel is a very effective process to remove ethanol from ester phase. ► LLE data of water systems are important for design and operation of biodiesel purification process. ► The ethanol mass fraction in the aqueous phase is much larger than in the ester phase. ► Global deviations below 3.1% with CPA EoS. ► Transferability of CPA binary parameters to predict LLE of biodiesel systems.