PHASE EQUILIBRIUM DATA FOR THE MIXTURES OF (WATER + PROPIONIC ACID + 1-HEPTANOL) AT T= 298.15 K

This study demonstrates the experimental solubility and tie line data for (water + propionic acid + 1-heptanol) system at T=298.15 K and atmospheric pressure. The cloud-point titration method was used to determine solubility data. The investigated ternary system exhibits type-1 behaviour of liquid-liquid equilibrium (LLE). The tie line data were determined by acidimetric titration, the Karl-Fischer technique, and refractive index measurements. The thermodynamic models UNIQUAC and NRTL were used to correlate the experimental tie-line data. The consistency of the tie-line data was determined through the Othmer-Tobias correlation equation. Distribution coefficients and separation factors were calculated over the immiscibility region

Keywords:

Phase equilibrium , Ternary mixture , Propionic acid , NRTL , UNIQUAC