Extraction of Sodium Chloride from Water and Solubility of Water in Hydrophobic Trialkylammonium Alkanoate-Based Ionic Liquids

The sodium chloride extraction from aqueous solutions by using hydrophobic trialkylammonium alkanoate ionic liquids (ILs) is studied experimentally. The water solubility in these ILs is also determined. It is found that trialkylammonium alkanoate ILs show sodium chloride extraction efficiencies up t...

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Bibliographic Details
Published in:Journal of chemical and engineering data 2010-09, Vol.55 (9), p.3391-3394
Main Authors: Janssen, Camiel H. C, Kroon, Maaike C, Metz, Sybrand J, van Spronsen, Jaap, Witkamp, Geert-Jan
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Exact sciences and technology
Liquid-liquid extraction
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Summary:The sodium chloride extraction from aqueous solutions by using hydrophobic trialkylammonium alkanoate ionic liquids (ILs) is studied experimentally. The water solubility in these ILs is also determined. It is found that trialkylammonium alkanoate ILs show sodium chloride extraction efficiencies up to 0.101 g NaCl extracted/g NaCl start. This efficiency cannot be explained by the low water uptake (up to 0.02 gwater/gIL) in the IL. Instead, the sodium chloride extraction must be attributed to other factors, such as steric hindrance considerations. Steric hindrance considerations also explain the dependence of sodium chloride extraction efficiency on the IL structure. Kinetic experiments were performed to ensure a state of chemical equilibrium.
ISSN:0021-9568
1520-5134
DOI:10.1021/je100062b