Liquid–Liquid Equilibrium Studies of Water/Phosphoric Acid/Mesityl Oxide Ternary Systems at Different Temperatures

Abstract

Phase equilibria of the ternary system (water + phosphoric acid + mesityl oxide) were investigated, and experimental tie-line data of liquid–liquid equilibrium were obtained at T = (298.2, 308.2, and 318.2) K and atmospheric pressure. The mass fractions of mesityl oxide and phosphoric acid were determined by high-performance liquid chromatography and acid–base titration, respectively. A limitation for the complete investigation of biphasic regions was observed in the (water + phosphoric acid + mesityl oxide) system, which was not detected in previous aqueous ternary systems containing mesityl oxide and other weak acids. The unsaturated carbon–carbon double bond of mesityl oxide is the cause of this limitation. Distribution coefficients (0.05 up to 0.25) and separation factors (1.05 up to 2.58) were determined over the biphasic area and proved the efficiency of mesityl oxide in the studied range. All the evaluated experimental data of the ternary system were correlated using the Hand equation to confirm the reliability of the endpoints. Temperature increments increased the extraction ability of mesityl oxide. The nonrandom two-liquid activity coefficient model was applied to correlate the measured tie-line points. Binary interaction parameters were obtained in each temperature, and temperature dependence of the parameters was investigated. The root-mean-square deviation values (less than 1% in all correlations) proved the quality of modeling, and the interaction parameters were validated. Biphasic regions were predicted using the obtained interaction parameters where experimental data could not be measured.

Liquid–Liquid Equilibria of the System Nitric Acid + Phosphoric Acid + Calcium Nitrate + Water + Tri-n-Octylamine at 298.15 K

“…To separate phosphoric acid or nitric acid, a variety of extractants have been used. Shekarsaraee et al 12 used mesityl oxide to extract phosphoric acid and investigated phase equilibria of water + phosphoric acid + mesityl oxide ternary systems at different temperatures. Ghanadzadeh Gilani et al 13 studied the ability of the aromatic esters to extract the phosphoric acid from water and measured ternary liquid−liquid equilibrium data for the {water + phosphoric acid + aromatic esters (benzyl acetate, benzyl benzoate, dimethyl phthalate, and diethyl phthalate)} systems at T = 298.2 K and P = 101.3 kPa.…”

Phase Equilibrium Data of Ternary Mixtures (Water + Orthophosphoric Acid + Chlorinated Methanes)

“…Because liquid–liquid equilibrium (LLE) is one of the most common methods for purification of orthophosphoric acid (OPA) from water, many researchers have improved the LLE data of OPA aqueous solutions using different organic solvents. − Alcohols, − ,, ethers, − ketones, ,,, esters, ,− ,, and hydrocarbons , were investigated as extractants in ternary systems. Solvent mixtures , were also applied for OPA recovery from its aqueous solutions but hydrocarbon derivates have not been used for investigation of LLE behaviors containing OPA.…”