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

Abstract

In this work, to separate the azeotrope of isopropanol and water using liquid-liquid extraction, two deep eutectic solvents (DESs) were prepared with methyl trioctyl ammonium chloride and (1-hexanol/1-decanol), which were characterized by 1 H NMR and were adopted as extractants. The liquid-liquid equilibrium data for the mixtures (DESs + isopropanol + water) were determined at 298.15 K and 308.15 K. The distribution ratio (D) and separation factor (S) were obtained to judge the extraction performance for the selected DESs. The calculated values of D and S showed that the separation of the mixture isopropanol and water by the DESs is feasible. In addition, the experimental data were successfully fitted by the NRTL model with the RMSD values less than 0.0080. The parameters of the NRTL model were optimized, which is helpful for the separation design and simulation.

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

“…To recover IPA by liquid–liquid extraction, the extractant selection has been reported in some literatures, for instance, organic solvents, − deep eutectic solvents, , and ionic liquids (ILs). − ILs have been applied in the separation field due to their superiority in designability, thermal stability, and negligible vapor pressure. − Cumplido et al − performed the liquid–liquid equilibrium (LLE) exploration for the mixture water + IPA with different imidazolium-based ILs at temperatures of 283.2–323.2 K. All the used ILs played a positive role in recovering IPA from the azeotropic mixture. Liu et al determined the LLE behavior for water + IPA with the ILs 1-hexyl-3-methyl imidazolium bis­(trifluoromethylsulfonyl)­imide ([Hmim]­[NTf 2 ]), 1-octyl-3-methyl imidazolium bis­(trifluoromethylsulfonyl)­imide ([Omim]­[NTf 2 ]), and 1-decyl-3-methyl imidazolium bis­(trifluoromethylsulfonyl)­imide ([Dmim]­[NTf 2 ]) at 298.15 K. The results demonstrated that the ionic liquid with the longer alkyl chain length exhibited a strong ability to recover IPA.…”

“…To recover IPA by liquid−liquid extraction, the extractant selection has been reported in some literatures, for instance, organic solvents, 12−15 deep eutectic solvents, 16,17 and ionic liquids (ILs). 18−23 ILs have been applied in the separation field due to their superiority in designability, thermal stability, and negligible vapor pressure. )…”

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

“…In this paper, the obtained LLE data were fitted with NRTL and UNIQUAC models to obtain each model’s optimal binary interaction parameter and the NRTL nonrandom parameter α. The UNIQUAC structure parameters ( r and q ) are obtained using Aspen Plus and shown in Table .…”

“…Under 101.3 kPa, the LLE data of water + FAL+ TCM/MIPK were explored at 303.2, 313.2, and 323.2 K. The distribution coefficient and separation coefficient were used to verify the feasibility of extracting FAL from water with those solvents. The LLE data were fitted with nonrandom two-liquid (NRTL) 11 and universal quasichemical (UNI-QUAC) 12 models, while GUI-MATLAB tested the consistency between the LLE data (experimental value and calculated value) and the calculated binary interaction parameters. The σprofiles of TCM, MIPK, water, and FAL were analyzed, which illustrated that the force of hydrogen bond formation enables TCM or MIPK to extract FAL from water.…”

Isobaric Vapor–Liquid Equilibrium Data for the Isopropanol–Water System

“…Isopropanol–water separation started to raise interest early in the last century and has been then studied in recent years to develop efficient methods to obtain pure isopropanol. Several processes have been suggested such as azeotropic distillation, , pressure swing distillation, a single unit of pervaporation membrane or multistage arrangements for the dehydration of isopropanol under adiabatic and ideal isothermal conditions, liquid–liquid extraction, reactive distillation, adsorption, the adoption of ionic liquids for breaking the azeotrope, and extractive distillation through deep eutectic solvents, also known as low transition temperature mixtures (LTTMs). − …”