What question did this study set out to answer?

The aim is to investigate the phase equilibria of phosphoric acid extraction using MIBK across various temperatures.

April 1, 2026

Phase Equilibria of the Ternary System Water–Phosphoric Acid–Methyl Isobutyl Ketone at 298.15, 308.15, and 318.15 K

Key Points

The aim is to investigate the phase equilibria of phosphoric acid extraction using MIBK across various temperatures.
Experimental extraction of phosphoric acid with MIBK at 25, 35, and 45°C under atmospheric pressure.
Correlation of tie line data using the NRTL model.
Use of a Graphical User Interface for model parameter verification.
Increased temperature leads to slight broadening of the heterogeneous region.
Tie line coordinates were successfully calculated and validated against experimental data.
Optimized parameters from the NRTL model showed reliability in matching experimental results.

Abstract

Experimental data were obtained for the extraction of phosphoric acid (PA) using Methyl Isobutyl Ketone (MIBK) at different temperatures (25, 35, and 45°C) under atmospheric pressure. The experimental data enable us to clarify the discrepancy between the reported data in the literature. It is observed that as the temperature increases from 25 to 45°C, the heterogeneous region shows a slight broadening. The measured data of tie lines were correlated with the Non-Random Two-Liquid (NRTL) model. To ensure the reliability of the optimized parameters, a Graphical User Interface tool was employed for model parameter verification. Tie line coordinates were then calculated based on the NRTL model, and the resulting data were compared against experimental data to validate the accuracy of the calculated results.

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