Salting-out extraction systems of ethanol and water induced by high-solubility inorganic electrolytes

Abstract

Abstract The salting-out extraction systems of ethanol and water induced by the high-solubility inorganic electrolytes were investigated at 25 °C. More than 99.90% of ethanol was salted out into the organic phase. The salt content of the organic phase is only about 0.01 wt%, which is negligible for the application of the ethanol–salt salting-out extraction. More than 90% of water can be retained in the aqueous phase. It is concluded that the salting-out effects of four salting-out agents on the aqueous solution of ethanol are ordered in the sequence: K4P2O7 > K3PO4 > K2HPO4 > K2CO3.