Liquid–Liquid Equilibrium for Ternary Mixture Water + (n-Propanol/Isopropanol) + Cyclohexanone at 298.15 and 308.15 K

Abstract

For separation of the azeotropes of n-propanol (NPA) + water and isopropanol (IPA) + water by liquid–liquid extraction, cyclohexanone was selected as the extraction solvent. The liquid–liquid equilibrium (LLE) behavior of the two mixtures (water + NPA + cyclohexanone) and (water + IPA + cyclohexanone) was investigated at temperatures 298.15 and 308.15 K. The LLE phase diagrams of the two mixtures belong to Treybal’s type I. According to the measured data, distribution ratio and separation factor obtained by calculation were used to analyze the extraction effect of cyclohexanone. In addition, the NRTL and UNIQUAC models were used to fit the LLE experimental data, and the values of root mean square deviation are smaller than 0.007. Lastly, the analysis of Gibbs energy surfaces was applied to validate the coherence of the fitted binary interaction parameters for the thermodynamic models.

Explorations of Liquid–Liquid Phase Equilibrium for the Mixture (Isopropanol + Water) with Pyridinium-Based Ionic Liquids

“…Afterward, the mixture was placed for 12 h to guarantee the clear split of the phases. The detailed procedures are provided in the references. , …”

“…The detailed procedures are provided in the references. 34,35 After the equilibrium state for the ternary mixture was obtained, the samples were taken out for analysis. The contents of water and IPA were tested by GC (SP-6890) using the area correction normalization method.…”

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.…”

“…There are few studies on alcohols as extractants, and this work also studies the liquid–liquid behavior of water + IPA + 1-octanol. However, the current research − on the LLE data of IPA and water systems at different temperatures is still insufficient. Therefore, it is urgent to obtain more reliable LLE data to realize industrial extraction and separation of IPA and water.…”

Liquid–Liquid Equilibrium Study of Ternary Systems of (Water + Furfuryl Alcohol + Solvents) at 303.2, 313.2, and 323.2 K

“…Each sample was measured multiple times to ensure that there are at least three results with a deviation of no more than 0.1%, and their average value was used for reporting. The standard uncertainty of specimen composition was obtained by GUM and related standards , whose value does not exceed ±0.0046.…”