About the Purification Route of Ionic Liquid Precursors

Massimo De Francesco, Elisabetta Simonetti, Gianremo Gorgi and Giovanni Battista Appetecchi
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Massimo De Francesco: 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
Elisabetta Simonetti: 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
Gianremo Gorgi: 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
Giovanni Battista Appetecchi: 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

Challenges, 2017, vol. 8, issue 1, 1-17

Abstract: 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 (PYR 14 Br) precursor, which represents the intermediate product of the synthesis process of the N -butyl- N -methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR 14 TFSI) 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 PYR 14 Br 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.

Keywords: Keywords: ionic liquid synthesis; aqueous route; purification through sorbents (search for similar items in EconPapers)
JEL-codes: A00 C00 Z00 (search for similar items in EconPapers)
Date: 2017
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Persistent link: https://EconPapers.repec.org/RePEc:gam:jchals:v:8:y:2017:i:1:p:11-:d:94160

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