Measurement and correlation of phase equilibria in aqueous two-phase systems containing functionalized magnetic ionic liquids and K2HPO4/K2CO3/Na2CO3 at 298.15 K

Abstract

Functionalized magnetic ionic liquids (MILs)([C 2 TMG][TEMPO-OSO 3 ], [C 3 TMG][TEMPO-OSO 3 ], [C 4 TMG][TEMPO-OSO 3 ]) and three inorganic salts (K 2 HPO 4 /K 2 CO 3 /Na 2 CO 3) were used to form aqueous two-phase system at 298.15 K. Three classical experienced equations were applied for the correlations of the binodal curves. All of them demonstrated satisfactory performance in data association. The binodal curves were investigated in detail. Both K 2 HPO 4 and K 2 CO 3 was excellent phase forming salts for all the three MILs. Both of them can meet the need of practical applications. There is a narrow biphasic region for the MIL+ Na 2 CO 3 +water system because of a relatively low solubility of salt in water. Additionally, tie-line data were experimentally obtained for the three MILs with K 2 HPO 4 or K 2 CO 3 at 298.15K. Three empirical formulas including Othmer-Tobias equation, Bancroft equation together with another equation derived from binodal theory were used to fit the tie-line data. Consequently, Othmer-Tobias has shown ideal correlation performance and the reliability of our experimental tie-line data can be ensured. Hopefully, these aqueous two-phase equilibrium data should be useful in the areas of chemical separation, purification and analysis.

The C–H activated controlled mono- and di-olefination of arenes in ionic liquids at room temperature

“…Ionic liquids (ILs), a class of non-molecular solvents at room temperature, 18 which generally consist of an organic cation and a weak nucleophilic anion, have drawn widespread attention of researchers due to their superior properties such as negligible volatility, thermal and chemical stability, wide liquid range, non-flammability, and good solubility. 19 They often replace hazardous organic solvents and serve as an environmental friendly, non-volatile and recyclable reaction medium. Furthermore, they are much safer in the high-temperature or high-pressure synthetic processes.…”

Liquid–Liquid Equilibrium of Aqueous Two-Phase System Composed of Poly(Ethylene Oxide) 1500 and Sodium Nitrate

“…Liquid extraction is used in chemical technology to extract and separate a wide range of organic and inorganic compounds. − Creation of extraction systems without organic solvent is a promising direction in the development of extraction methods, − one of which is the aqueous two-phase systems (ATPS). − These systems have exceptional advantages over classical extractants, such as environmental safety, fire safety, and accessibility. Aqueous two-phase systems can be used in biotechnological processes, pharmaceuticals, for the extraction of metal ions, and so on, − which is confirmed by a large number of articles and reviews.…”

An overview of magnetic ionic liquids: From synthetic strategies to applications in microextraction techniques

“…However, multiple reaction steps involving laborious and time-consuming procedures based on filtration, drying, and purification were required for synthesizing the [N 1 1 n 2OH ]Br and [N 1 1 n 2OH ]Cl ionic liquids, Na[TEMPO-OSO 3 ], and the MILs. Other studies involving the synthesis of organic MILs have been recently reported[55,59,60].…”