Experimental investigation and thermodynamic modeling of the ternary aqueous solution of propionic acid and isoamyl alcohol

This work demonstrates the ability of the isoamyl alcohol to act as an extraction solvent in petrochemical processes for the removal of a carboxylic acid from its azeotropic mixture with water. The experimental solubility and tie line data for (water + propionic acid + isoamyl alcohol) system were determined 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 behavior of liquid-liquid equilibrium (LLE). The tie line data were determined by acidimetric titration, the Karl-Fischer technique, and refractive index measurements. 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. The UNIQUAC and NRTL thermodynamic models were used to correlate the experimental tie-line data

کلیدواژه ها:

Liquid-liquid equilibrium ، Ternary mixture ، Propionic acid ، NRTL ، UNIQUAC