Add time:08/28/2019         Source:sciencedirect.com

In this study, experimental liquid-liquid equilibria were studied for the {water + phosphoric acid + ester (n-propyl- and n-amyl acetates)} systems at T = (298.2, 308.2, and 318.2) K and p = 101.3 kPa. The studied systems exhibit type-1 binodal curves. Solubility curves data were measured by cloud-point titration method. Tie line measurements were carried out by acidimetric titration, the Karl–Fischer technique, and refractive index measurements. Correlation of the experimental equilibrium data was carried out using NRTL and UNIQUAC thermodynamic models. The quality of the tie-lines was checked through The Othmer–Tobias correlation equation. Distribution coefficients and separation factors were calculated over the biphasic regions. The experimental results indicate that n-amyl acetate is better solvent than n-propyl acetate for removal of phosphoric acid from water.

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