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

Abstract

Three pyridinium-based ionic liquids (ILs) were adopted to extract isopropanol (IPA) from its aqueous mixture for investigating the potential of these ILs in the separation of a (water + IPA) azeotropic mixture. The liquid–liquid equilibrium values for the mixtures (water + IPA + ILs) was determined at 298.15 K. The selectivity and distribution coefficient were computed, which indicates that the IL n-hexylpyridinium bis­(trifluoromethyl sulfonyl)­imide displays a better extraction effect to separate the mixture of IPA and water. Besides, the NRTL model was applied to regress the determined tie-line values, and the coherence of the optimized binary parameters was examined using the Gibbs energy surfaces analysis.

Comparative evaluation of liquid–liquid equilibria for extraction of 2,2,3,3‐tetrafluoro‐1‐propanol from water by a ZIF‐8‐porous ionic liquid

“…The solubility data of the system water + [Bpy][NTf 2 ] is summarized in Fig. 1 and compared with the corresponding literature 36‐39 . The solubility of water and IL [Bpy][NTf 2 ] in this work agree well with the literature.…”

“…Solubility in mass fraction for the binary mixture [Bpy][NTf 2 ] + water with the literature data: (), this work; (), reference 36; (), reference 37; (), reference 38; (), reference 39.…”

What does the NRTL model look like? Determination of boundaries for different fluid phase equilibrium regions

“…The mathematical application of the previous constraints can be done directly in the case of using any spreadsheet (such as Microsoft Excel and its solver toolbox) for the correlation calculations. [60][61][62][63] In the case of using a specific optimization software such as GAMS, 64 the previous disjunctions could be reformulated as an MINLP model by using the Big M reformulation or the general hull reformulation in the case of nonlinear equations. 65,66…”

Measurement and Thermodynamic Modeling of Liquid–Liquid Equilibrium Data for Ternary Systems (Water + Formaldehyde + Methyl Isobutyl Ketone/Cyclohexanone) at Different Temperatures

“…Liquid–liquid extraction, as an effective separation process, can be used in industrial and economic applications. , The function parameters regressed by LLE data are of great significance in the design of the extraction process. So far, there have been many pieces of research on the ternary or quaternary mixtures for formaldehyde, methanol, methylal, and water in the literature.…”