Liquid–liquid equilibria for 1-butyl-4-methylpyridinium tetrafluoroborate and inorganic salts aqueous two-phase systems

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• 作者：Yuliang Li ; Yuxing Gu ; Xiaojia Lu
• 关键词：Liquid–liquid equilibria ; Aqueous two ; phase system ; Binodal curves ; 1 ; Butyl ; 4 ; methylpyridinium tetrafluoroborate
• 刊名：Journal of Thermal Analysis and Calorimetry
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：122
• 期：3
• 页码：1455-1468
• 全文大小：1,073 KB
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• 作者单位：Yuliang Li (1)
  Yuxing Gu (1)
  Xiaojia Lu (1)
  
  1. College of Environment Science and Engineering, Chang’an University, Xi’an, 710064, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Sciences
  Polymer Sciences
  Physical Chemistry
  Inorganic Chemistry
  Measurement Science and Instrumentation
  
• 出版者：Akad茅miai Kiad贸, co-published with Springer Science+Business Media B.V., Formerly Kluwer Academic
• ISSN：1572-8943

文摘

Liquid–liquid equilibria were determined at 305.15 K for aqueous two-phase systems (ATPSs) containing 1-butyl-4-methylpyridinium tetrafluoroborate + inorganic salts (NaH₂PO₄·2H₂O, (NH₄)₂SO₄, Na₂SO₄, and Na₂HPO₄·12H₂O) + water. Four nonlinear equations were used to correlate the binodal data, and the binodal curves were used to describe and display the effect of different experimental salts on phase separation. Furthermore, a simple, two-parameter equation, along with the Othmer–Tobias and Bancroft equations, was used to correlate the tie-line data. All the results showed good agreement between the fitting equations and the experimental data. The effect of temperature on the binodal curves and tie-lines for 1-butyl-4-methylpyridinium tetrafluoroborate + Na₂SO₄ + water systems was studied at T = 298.15, 311.15 and 338.15 K. Additionally, the effect of Gibbs energy on the salting-out ability of the different inorganic salts was discussed. From this study, we concluded that these salting-out abilities decline in the following order: Na₂HPO₄ > Na₂SO₄ > (NH₄)₂SO₄ > NaH₂PO₄. These data may be helpful for the further investigation of ATPSs based on the ionic liquid 1-butyl-4-methylpyridinium tetrafluoroborate. In summary, our study determined the basic extraction data for this aqueous two-phase system and developed a fundamental method for the further study of material separation. Keywords Liquid–liquid equilibria Aqueous two-phase system Binodal curves 1-Butyl-4-methylpyridinium tetrafluoroborate