“…Three different temperatures (298.15, 308.15 and 318.15 K) at atmospheric pressures were selected to study the ternary equilibrium system in order to observe the evaluation of the binodal curves and tie-lines. The binodal (solubility) curves were determined by the cloud point method in an equilibrium glass cell with a water jacket, which is presented in previous work [6], to maintain isothermal conditions. The temperature in the cell was kept constant by circulating water from a water bath (NUVE, BS 302 Model), which is equipped with a temperature controller capable of maintaining the temperature within ±0.1 K. The major central part of the solubility curves was obtained by titrating heterogeneous mixtures of water + alcohol with propionic acid until the turbidity had disappeared.…”