Measurement and Modeling of Liquid–Liquid Equilibria for Water–Phosphoric Acid–Aromatic Esters

A systematic experimental study of the isoplethic sections for the quaternary system H 2 O−H 3 PO 4 −TBP−MIBK was carried out at 298.2 K under atmospheric pressure in order to evaluate the synergic effect of tributyl phosphate (TBP) and methyl isobutyl ketone (MIBK) as a mixed solvent for orthophosphoric acid (H 3 PO 4 ) extraction. Liquid−liquid equilibria diagrams were fully established for the following TBP/MIBK mass-percent ratios: 0/ 100, 30/70, 50/50, 80/20, and 100/0. The reliability of the LLE measurements was confirmed by the Othmer-Tobias and Hand equations. The results show that the quaternary system is type II and that the demixing area expands with an increasing TBP content. Moreover, the mixed solvent enhances MIBK selectivity for acid concentrations below 50 wt %, while the 80/ 20 weight ratio shows the optimal selectivity for acid concentrations below 25 wt %. Furthermore, these experimental results were compared to the values predicted by the NRTL model. It can be seen that the interaction parameters of the NRTL model used provide good results with a root-mean-square deviation (RMSD) of 0.0135.

Section: Introductionmentioning

confidence: 99%

Enhancement of Orthophosphoric Acid Extraction by the Synergic Effect of Tributyl Phosphate and Methyl Isobutyl Ketone in the Quaternary System H₂O–H₃PO₄–TBP–MIBK at 298.2 K

Mouhib,

Kaddami,

Counioux

et al. 2024

“…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. C ̌ernáet al 14 studied the distribution of nitric acid between water or aqueous solutions of ammonium nitrate and xylene solutions of tri-n-octyhnethylammonium nitrate or Nivol/2-ethylhexanol solutions of Aliquat 336 nitrate.…”

Section: Introductionmentioning

confidence: 99%

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

Cao

Dong

et al. 2023

Liquid−liquid equilibrium (LLE) data of the system nitric acid + phosphoric acid + calcium nitrate + water + tri-n-octylamine (TOA) were measured at 298.15 K and atmospheric pressure. The distribution coefficients of nitric acid, phosphoric acid, calcium nitrate, and water and the separation factors of nitric acid against phosphoric acid, nitric acid against calcium nitrate, and nitric acid against the water were calculated. Based on these data, the capability and selectivity of TOA for extracting nitric acid in this system were evaluated. The experimental results were used to obtain binary interaction parameters and pair parameters as correlated by the electrolyte non-random two-liquid (eNRTL) model. The eNRTL model was shown to be suitable for predicting the LLE data of this system, with a rootmean-square deviation of just 1.17%.

“…As far as one might find from the literature, solvents containing functional groups of ethers, − esters, − tertiary amines, amides, aliphatic and aromatic hydrocarbons, − and tributyl phosphates − have been employed in the recovery of PA from aqueous solutions. Nevertheless, among various solvent types, primary alcohols offer several advantages of low cost, facile applicability, and rapid separation from the setting .…”

Section: Introductionmentioning

confidence: 99%

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

Shekarsaraee

Shamizad

2021

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.