Phase behaviour at different temperatures of an aqueous two-phase ionic liquid containing ([Bmim]BF4+manganese sulfate+water)

► Experimental IL-ATPS data were acquired for the [Bmim]BF4+MnSO4+H2O system at 5 different temperatures. ► An phase inversion was observed between (288.15 and 303.15)K with decreasing system temperature. ► The influence of the cation on the process of phase segregation was assessed in terms of the...

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Veröffentlicht in:The Journal of chemical thermodynamics 2013-06, Vol.61, p.45-50
Hauptverfasser: Alvarenga, Bruno Giordano, Virtuoso, Luciano Sindra, Lemes, Nelson Henrique Teixeira, Luccas, Pedro Orival
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Sprache:eng
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Zusammenfassung:► Experimental IL-ATPS data were acquired for the [Bmim]BF4+MnSO4+H2O system at 5 different temperatures. ► An phase inversion was observed between (288.15 and 303.15)K with decreasing system temperature. ► The influence of the cation on the process of phase segregation was assessed in terms of the free energy of hydration. ► The mathematical treatment of data was realized using Setschenow and Merchuk equations. The phase diagrams and liquid+liquid equilibrium (LLE) data of the 1-butyl-3-methylimidazolium tetrafluoroborate {([Bmim]BF4)+Manganese sulfate (MnSO4)+water} system have been determined experimentally at T=(288.15, 293.15, 298.15, 303.15 and 308.15)K. As the temperature decreases, this aqueous two-phase system exhibits a phase inversion. Specifically, the [Bmim]BF4-rich phases are the less dense top phases at high temperatures but become the bottom phase at elevated temperatures. The effect depends on the concentration of both the [Bmim]BF4 and MnSO4. At temperatures of (293.15 and 303.15)K, inversion occurs for the system only at higher concentrations of either phase-forming constituent. In addition, as the temperature increases the inversion-phase region expands. The binodal curves are fitted to an empirical non-linear expression developed by Merchuk, and the salting-out effect at various temperatures was studied quantitatively using the Setschenow equation.
ISSN:0021-9614
1096-3626
DOI:10.1016/j.jct.2013.01.025