Thermogravimetric measurement of deep eutectic solvents vapor pressure

Kaveh Shahbaz*, Farouq S. Mjalli, Gholamreza Vakili-Nezhaad, Inas M. AlNashef, Alec Asadov, Mohammed M. Farid

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

Knowledge of volatility of solvents in general and ionic liquids analogues in particular is crucial for thermodynamic modelling and proper solvent selection. In this study, the vapor pressure of a selected set of ionic liquids analogues known as deep eutectic solvents (DES) was investigated by thermogravimetric analysis (TGA). The experimental measurements were conducted for the practical temperature range of 343.15 to 393.15 K. In general, measurements revealed that DESs have low but detectable vapor pressure. Compared to some common ionic liquids, DESs have higher vapor pressure. It is interesting to know that the vapor pressure-temperature relationship of DESs is more complex than that of molecular liquids as well as that of most ionic liquids. The conventional Antoine model was not able to explain the variation of vapor pressure with temperature. However, the vapor pressure was found to exhibit a noticeable trend with the DES critical temperature which was estimated theoretically. The Wagner vapor pressure model was able to predict the vapor pressure with an average %AAD of 2.89%.

Original languageEnglish
Pages (from-to)61-66
Number of pages6
JournalJournal of Molecular Liquids
Volume222
DOIs
Publication statusPublished - Oct 1 2016

Keywords

  • Choline chloride
  • Deep eutectic solvents
  • Glycerol
  • TGA
  • Vapor pressure
  • Wagner model

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry

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