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About the Purification Route of Ionic Liquid Precursors

ENEA, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, SSPT-PROMAS-MATPRO and DTE-STT-SCIS Laboratories, Via Anguillarese 301, Rome 00123, Italy
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Academic Editors: Annalisa Paolone and Lorenzo Ulivi
Challenges 2017, 8(1), 11; https://doi.org/10.3390/challe8010011
Received: 26 December 2016 / Revised: 7 March 2017 / Accepted: 22 March 2017 / Published: 27 March 2017
(This article belongs to the Special Issue Selected papers from Thematic Meeting “Materials for Energy”)
In this work a purification route of precursors for ionic liquids tailored to electrochemical energy storage systems is reported and described. The study was carried out on the N-butyl-N-methylpyrrolidinium bromide (PYR14Br) precursor, which represents the intermediate product of the synthesis process of the N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR14TFSI) hydrophobic ionic liquid. The target is to develop an easy and cost-effective approach for efficiently purifying several kinds of ionic liquid precursors and determining their purity content. The PYR14Br precursor was synthesized through an eco-friendly preparation procedure, which requires water as the only processing solvent, and purified through sorbent materials, such as activated charcoal and alumina. The effect of the treatment/nature/content of sorbents and processing temperature/time was investigated. The impurity content was detected by UV-VIS spectrophotometry measurements. Additionally, a correlation between the measured absorbance and the content of impurities within the precursor was obtained. The purity level of the precursor was seen to play a key role in the electrochemical performance of the ionic liquids. View Full-Text
Keywords: Keywords: ionic liquid synthesis; aqueous route; purification through sorbents Keywords: ionic liquid synthesis; aqueous route; purification through sorbents
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De Francesco, M.; Simonetti, E.; Gorgi, G.; Appetecchi, G.B. About the Purification Route of Ionic Liquid Precursors. Challenges 2017, 8, 11.

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