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Multiple headspace extraction for gas detection in ionic liquids.

D Müller1, M Fühl1, K Pinkwart1

  • 1Fraunhofer Institut für Chemische Technologie, Joseph-von-Fraunhofer-Str. 7, D-76327 Pfinztal (Berghausen), Germany.

Journal of Chromatography. A
|December 3, 2014
PubMed
Summary

Multiple headspace extraction accurately measured gas solubility in ionic liquids (ILs). This cost-effective method provides crucial data for assessing IL applications involving gas reactions.

Keywords:
Carbon monoxideEthylmethylimidazolium tetracyanoborateGas solubilityIonic liquidsMultiple headspace extractionOxygen

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Area of Science:

  • Analytical Chemistry
  • Physical Chemistry
  • Materials Science

Background:

  • Ionic liquids (ILs) are versatile solvents with numerous applications, particularly in processes involving gas reactions.
  • Understanding gas solubility in ILs is critical for evaluating the feasibility and efficiency of these applications.
  • Traditional methods for measuring gas solubility can be complex or expensive.

Purpose of the Study:

  • To introduce and validate multiple headspace extraction (MHE) as a novel technique for determining gas saturation concentrations in ILs.
  • To measure the solubility of carbon monoxide (CO) and oxygen (O2) in various ILs, including those with less common anions.
  • To establish MHE as a cost-effective and accessible method for gas solubility analysis in ILs.

Main Methods:

  • Multiple headspace extraction (MHE) was employed to measure the saturation concentrations of CO and O2.
  • Gas solubility was determined in ILs featuring tetracyanoborates and other unique anions.
  • Results were validated against existing literature data, confirming the accuracy of MHE.

Main Results:

  • MHE proved to be a powerful and accurate tool for measuring gas solubility in ILs.
  • The saturation concentrations of CO and O2 in the studied ILs ranged from 1.5 to 6.5 mmol/L.
  • The technique demonstrated good agreement with established literature values.

Conclusions:

  • Multiple headspace extraction is a reliable, cost-effective, and accessible method for determining gas solubility in ionic liquids.
  • The findings provide essential solubility data for carbon monoxide and oxygen in specific ILs, aiding in application assessment.
  • MHE offers a practical solution for analytical laboratories seeking to study gas-liquid interactions in ILs.