Speeds of sound in ionic liquids under elevated pressures. New experimental data and CP-PC-SAFT modelling

Jeremiasz Pilarz, Joanna Feder-Kubis, Vyacheslav V. Melent'ev, Olga S. Ryshkova, Vadim I. Korotkovskii, Anton K. Radchenko, Eugene B. Postnikov, Mirosław Chorążewski, Ilya Polishuk

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

This study reports synthesis of a new ionic liquid ethyl-1-octyloxymethylimidazolium bis(trifluoromethylsulfonyl)imide ([C2imC1OC8][NTf2]) and its speed of sound data at 295.15 K ≤ T ≤ 373.15 K and 1 bar ≤ P ≤ 1471.5 bar. In addition, the atmospheric pressure densities of this IL were measured at 292.05 K ≤ T ≤ 423.65 K and determined at 295.15 K ≤ T ≤ 373.15 K and 1 bar ≤ P ≤ 1500 bar. Basing on a representative variety of ILs, it is demonstrated that the CP-PC-SAFT EOS adjusted to their high-pressure density data by a standardized numerical procedure and attached by a simple expression for estimating the ideal gas heat capacities is capable to predict sound velocities in a particularly accurate manner, with AAD around 1% and at times even smaller that the experimental uncertainties.

Original languageEnglish
Article number112669
JournalJournal of Molecular Liquids
Volume303
DOIs
StatePublished - 1 Apr 2020

Keywords

  • CP-PC-SAFT
  • Ionic liquids
  • Predictive modelling
  • Speed of sound
  • Synthesis

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