Thermodynamic Equilibrium of Aqueous Two-Phase Systems Composed of [C4mim]BF4 + MgCl2/Na2WO4 + H2O at Different Temperatures

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• 作者：Tingting Wang ; Dan Zhang ; Yunfeng Cai ; Juan Han ; Qian Liu ; Yun Wang
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2016
• 出版时间：May 12, 2016
• 年：2016
• 卷：61
• 期：5
• 页码：1821-1828
• 全文大小：372K
• 年卷期：0
• ISSN：1520-5134

文摘

Binodal data for the 1-butyl-3-methylimidazolium tetrafluoroborate ([C₄mim]BF₄) + salt (MgCl₂/Na₂WO₄) + H₂O systems were experimentally determined at T = (288.15, 298.15, and 308.15) K, respectively. The binodal data were successfully correlated by an empirical equation with four parameters. The liquid–liquid equilibrium data were given and satisfactorily correlated by the Othmer–Tobias and Bancroft equations, as well as a two-parameter equation. Additionally, the Chen-NRTL model, the Pitzer-Debye–Hückel equation, and the Flory–Huggins equation were used to determine and correlate the liquid–liquid equilibrium data for the studied systems, and good agreement was obtained with these thermodynamic models. The influences of the two salts and temperature on the phase equilibrium were investigated. The phase-separation ability of MgCl₂ is stronger than that of Na₂WO₄. As the temperature of the systems decreases, the two-phase region shows an expansion trend.