Liquid–Liquid Equilibria Data of Protic Ionic Liquid (Ethyl-2-hydroxyethylammonium Propionate, Diethylammonium Propionate, or Butylammonium Propionate) with 1-Butanol + Water at 298.15 K

Liquid–liquid equilibrium (LLE) data for systems involving 1-butanol + water + protic ionic liquids ethyl-2-hydroxyethylammonium propionate [E2HEA][Pr], diethylammonium propionate [DEA]]Pr], or butylammonium propionate [BA][Pr] were determined at 298.15 K and atmospheric pressure. The solubility curves were obtained by the cloud point method and correlated with different empirical equations. The compositions of the phases in equilibrium were...