Experimental and Correlated Liquid–Liquid Equilibrium Data for (Water + Propionic Acid + Ethylbenzene or Benzyl Benzoate) Ternary Systems

Abstract

This paper reports the ternary liquid−liquid equilibrium (LLE) data for water−propionic acid−ethylbenzene at T = (308.2 and 318.2) K and water− propionic acid−benzyl benzoate systems at T = (298.2, 308.2, and 318.2) K and p = 0.1 MPa for the first time. Solubility data and mutual solubilities between ethylbenzene or benzyl benzoate and water were measured using the traditional cloud point method. Tie lines were experimentally obtained using acidimetric titration, the Karl Fisher titration and the refractive index measurements on the both aqueous and organic phases. The ternary systems exhibit type-1 phase behavior. The reliability of the tie-line data exhibited linear behavior in the Hand and Othmer−Tobias correlation plots. The experimental tie line data were correlated using the nonrandom two-liquid and universal quasichemical thermodynamic models, and the corresponding binary interaction parameters were determined. The results demonstrate the capability of the two models in correlation and description of the phase behavior of the related ternary systems with acceptable average root-mean-square deviation (rmsd) values. As a result, temperature has only a minor effect on the LLE behavior of the system containing benzyl benzoate.

Comparative Evaluation of Liquid–Liquid Phase Equilibria for Aqueous Mixtures of Acetic Acid with Structurally Related Aryl Carbonyl Compounds at 298.2 and 308.2 K

“…In our earlier LLE studies, the equilibrium data for the aqueous solutions of carboxylic acids including propionic acid (PA) with different aryl solvents belonging to the different chemical classes (i.e., aryl alcohol, aryl ketone, and aryl ester) have been examined and compared. , As an extension of the earlier research, we report the LLE data for the ternary aqueous mixtures of acetic acid and aryl solvents at T = (298.2 and 308.2) K and p = 101 kPa. In this research, three aryl carbonyl compounds were tested as the extraction solvent for acid extraction from water.…”