Experimental study of phase equilibria in aqueous mixtures of phosphoric acid with isoamyl acetate and methyl isoamyl ketone at T = (298.2, 308.2, and 318.2) K

This study demonstrates the experimental solubility and tie-line data for (water + phosphoric acid + isoamyl acetate or methyl isoamyl ketone) ternary systems at T = (298.2, 308.2, and 318.2) K and atmospheric pressure for the first time. The concentration of each phase was determined by acidimetric titration, the Karl Fischer technique, and refractive index measurements. The experimental tie-line data were correlated using the UNIQUAC and NRTL models. The reliability of the experimental data was determined through the Othmer–Tobias and Hand plots. Distribution coefficients and separation factors were evaluated over the immiscibility regions.

► Liquid phase equilibria of (water + PA + IAA or MIAK) system were studied.
► Experimental LLE data were correlated with NRTL and UNIQUAC models.
► Distribution coefficients and separation factors were calculated.