Determination and Correlation of Liquid–Liquid Equilibria Data for Ternary System Isopropyl Acetate + Isopropanol + Water at Different Temperatures

Abstract

The liquid−liquid equilibrium (LLE) data for the (isopropyl acetate + isopropanol + water) ternary system were determined experimentally using an equilibrium cell from 298.15 to 323.15 K at 101.3 kPa to obtain the fundamental data guiding the separation process of isopropyl acetate and isopropanol mixtures. The solvents' extraction capacity was assessed by the solute distribution coefficient and selectivity. Othmer−Tobias and Bachman correlations for tie lines were used to assess the smoothed trend of the measured data. Thermodynamic models NRTL and UNIQUAC were used to correlate experimental data and obtain relevant binary interaction parameters. Both models provided good descriptions of the studied systems with rootmean-square deviations (RMSDs) of less than 0.2%. Moreover, a lower RMSD was found for the UNIQUAC model, demonstrating that it can correlate the experimental data successfully.

Experiment and Correlation of Liquid–Liquid Equilibrium Data for Water + 2-Propanol + 1-Octanol or n-Propyl Acetate at 298.2, 308.2, and 318.2 K under 101.3 kPa

“…Table lists D and S values, and the comparison with the literature , is shown in Figures and . It can be seen from Table that the S gradually decreases with the addition of IPA, and the system of 1-octanol decreases more obviously than that of n -propyl acetate.…”

“…The D value of 1-octanol is greater than that of n -propyl acetate. This work was compared with the extraction capacity of isopropyl acetate researched by Zhang and cyclohexanone researched by Wang, and it was found that the order of D value from large to small is 1-octanol, cyclohexanone, n -propyl acetate, and isopropyl acetate. The results show that when 1-octanol, cyclohexanone, and n -propyl acetate are used as extractants, the extraction rate is higher, meaning fewer extractants are needed to achieve the same extraction goal.…”

“…Hong et al studied the extraction ability of ethyl acetate, isopropyl acetate, and ethyl caproate to IPA in water at 283.15, 303.15, and 323.15 K. This study found that ethyl caproate is a preferred extractant for separating IPA from aqueous solutions. Zhang et al studied the LLE for the isopropyl acetate + IPA + water from 303.15 to 323.15 K. The results show that the distribution coefficient of IPA of this system is too low, which leads to the limitation in industrial application. This work aims to find an extractant with good extraction performance to separate IPA from water.…”

Liquid–Liquid Equilibrium for the Ternary Systems Water + 1-Butanol + 1-Hexanol or 1-Octanol at 303.15, 313.15, and 323.15 K

“…The thermometer was calibrated with zero-scale and multiple-point. The experimental instruments and sampling method introduced in this work were identical to those reported in the previous publications. , The chromatographic peak area fraction was converted to the mole fraction by determining the relative mole correction factor for each substance using the internal standard method, and finally, all the components in the conjugation phase were quantified. Among them, isopropanol with a mass fraction purity of >99.90% (GC) was used as the standard compound.…”

Separation of isopropanol from its aqueous solution with deep eutectic solvents: liquid–liquid equilibrium measurement and thermodynamic modeling

“…However, azeotropic distillation and extractive distillation require more energy consumption and complicated equipment. Nowadays, liquid-liquid extraction (Demakhin et al 2011;Zhang et al 2019;Cumplido et al 2020) is used in the separation of azeotropic mixtures due to its energy-savings.…”