Liquid Phase Equilibrium Data in Aqueous Solution of Phosphoric acid with Ester

The separation of substances by distillation or other methods that have high energy consumption and are harmful to the environment, are not environmentally and economically useful. Therefore, the extraction of phosphoric acid from water is an important problem in the wet process method. Solubility and tie-line data for the ternary system of water + phosphoric acid + organic solvent (propyl acetate) were determined and correlated at 298.2 K and atmospheric pressure. The solubility data were determined by cloud-point titration method. The tie line data were obtained using acid-base titration and refractive index measurements. A type-1 LLE phase diagram was obtained for this ternary system. The material balance and cloud point procedure was used to check the experimental tie-line values. The reliability of the experimental tie line data was determined through the Othmer-Tobias plot. Experimental distribution coefficients and separation factors were evaluated over the biphasic region. The experimental results show the ability of propyl acetate for the extraction of phosphoric acid from aqueous solutions.

Organic solvent, Phosphoric acid, Liquid–Liquid equilibrium, Othmer-Tobias