Abstract
Aqueous biphasic systems (ABS) composed of ionic liquids (ILs) and inorganic salts (ISs) have been by far the most investigated class of IL-based ABS. In the present chapter, the formation of this type of systems is discussed keeping in mind that the IS acts as a salting-out agent, while ILs are very special salted-out solutes. The task at hand is rather straightforward due to two important circumstances: (i) the start of this particular research front one decade ago has been defined by a groundbreaking paper in 2003; and (ii) the development of ABS brought about by the use of ILs has been thoroughly described in a recent review paper in 2012. Therefore, this chapter is not about an exhaustive listing of (IL + IS) ABS but rather a general synopsis of the evolution of the field, highlighting different types of experiments that allowed the rationalization of salting-out/salting-in effects in the context of ABS formation mediated by ILs and ISs.
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References
Gutowski KE, Broker GA, Willauer HD et al (2003) Controlling the aqueous miscibility of ionic liquids: aqueous biphasic systems of water-miscible ionic liquids and water-structuring salts for recycle, metathesis, and separations. J Am Chem Soc 125:6632–6633
Freire MG, Cláudio AFM, Araújo JMM et al (2012) Aqueous biphasic systems: a boost brought about by using ionic liquids. Chem Soc Rev 41:4966–4995
Bridges NJ, Gutowski KE, Rogers RD (2007) Investigation of aqueous biphasic systems formed from solutions of chaotropic salts with kosmotropic salts (salt–salt ABS). Green Chem 9:177–183
Chou I-M (1982) Phase relations in the system NaCl-KCl-H2O. Part I: differential thermal analysis of the NaCl-KCl liquidas at 1 atmosphere and 500, 1000, 1500, and 2000 bars. Geochim Cosmochim Acta 46:1957–1962
Thompson AR, Vener RE (1948) Solubility and density isotherms. Ind Eng Chem 40:478–481
Lynn S, Schiozer AL, Jaecksch WL et al (1996) Recovery of anhydrous Na2SO4 from SO2-scrubbing liquor by extractive crystallization: liquid − liquid equilibria for aqueous solutions of sodium carbonate, sulfate, and/or sulfite plus acetone, 2-propanol, or tert-butyl alcohol. Ind Eng Chem Res 35:4236–4245
Najdanovic-Visak V, Canongia Lopes JN, Visak ZP et al (2007) Salting-out in aqueous solutions of ionic liquids and K3PO4: Aqueous Biphasic Systems and salt precipitation. Int J Mol Sci 8:736–748
Freire MG, Carvalho PJ, Silva AMS et al (2009) Ion specific effects on the mutual solubilities of water and hydrophobic ionic liquids. J Phys Chem B 113:202–211
Freire MG, Neves CMSS, Silva AMS et al (2010) 1H NMR and molecular dynamics evidence for an unexpected interaction on the origin of salting-in/salting-Out phenomena. J Phys Chem B 114:2004–2014
Tomé LIN, Varanda FR, Freire MG et al (2009) Towards an understanding of the mutual solubilities of water and hydrophobic ionic liquids in the presence of salts: the anion effect. Phys Chem B 113:2815–2825
Ventura SPM, Sousa SG, Serafim LS et al (2011) Ionic liquid based aqueous biphasic systems with controlled pH: the ionic liquid cation effect. J Chem Eng Data 56:4253–4260
Ventura SPM, Neves CMSS, Freire MG et al (2009) Evaluation of anion influence on the formation and extraction capacity of ionic-liquid-based aqueous biphasic systems. J Phys Chem B 113:9304–9310
Ventura SPM, Sousa SG, Serafim LS et al (2012) Ionic-liquid-based aqueous biphasic systems with controlled pH: the ionic liquid anion effect. J Chem Eng Data 57:507–512
Neves CMSS, Ventura SPM, Freire MG et al (2009) Evaluation of cation influence on the formation and extraction capability of ionic-liquid-based aqueous biphasic systems. J Phys Chem B 113:5194–5199
Li ZY, Pei YC, Liu L et al (2010) (Liquid + liquid) equilibria for (acetate-based ionic liquids + inorganic salts) aqueous two-phase systems. J Chem Thermodyn 42:932–937
Pei YC, Wang JJ, Liu L et al (2007) Liquid − liquid equilibria of aqueous biphasic systems containing selected imidazolium ionic liquids and salts. J Chem Eng Data 52:2026–2031
Pei YC, Wang JJ, Wu K et al (2009) Ionic liquid-based aqueous two-phase extraction of selected proteins. Sep Purif Technol 64:288–295
Shahriari S, Neves CMSS, Freire MG et al (2012) Role of the Hofmeister series in the formation of ionic-liquid-based aqueous biphasic systems. J Phys Chem B 116:7252–7258
Acknowledgments
The author would like to thank Prof. Luís Paulo Rebelo for his groundbreaking contributions in the area of IL-based ABS and his permanent willingness for promoting stimulating discussions that helped to shape the whole field of IL research.
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Canongia Lopes, J.N. (2016). ABS Composed of Ionic Liquids and Inorganic Salts. In: Freire, M. (eds) Ionic-Liquid-Based Aqueous Biphasic Systems. Green Chemistry and Sustainable Technology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-52875-4_2
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DOI: https://doi.org/10.1007/978-3-662-52875-4_2
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