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About the Purification Route of Ionic Liquid Precursors

Author

Listed:
  • 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)

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.

Suggested Citation

  • Massimo De Francesco & Elisabetta Simonetti & Gianremo Gorgi & Giovanni Battista Appetecchi, 2017. "About the Purification Route of Ionic Liquid Precursors," Challenges, MDPI, vol. 8(1), pages 1-17, March.
    • Handle: RePEc:gam:jchals:v:8:y:2017:i:1:p:11-:d:94160
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