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Determination of ethanol in ionic liquids using headspace solid-phase microextraction–gas chromatography

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Abstract

The application of ionic liquids (ILs) as nonderivatizing solvents for the pretreatment and regeneration of cellulose is a growing area of research. Here we report the development of a rapid and simple method for the determination of residual ethanol content in two hydrophilic ILs, 1-butyl-3-methylimidazolium chloride and 1-ethyl-3-methylimidazolium acetate. The method utilizes headspace solid-phase microextraction coupled with gas chromatography at elevated extraction temperatures, resulting in rapid equilibration times. The effect of IL water content on the ethanol extraction efficiency is presented. Recovery experiments carried out in real samples gave recoveries ranging from 96.8 to 98.2%.

Ionic liquids are becoming widely used as solvents for the regeneration of lignocellulosic biomass. In this communcation, a method based on headspace solid-phase microextraction coupled to gas chromatography is described to determine the ethanol content in two widely used ionic liquid matrices

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Acknowledgements

J.L.A. acknowledges funding from the Analytical and Surface Chemistry Program in the Division of Chemistry and the Separation and Purification Processes Program in the Chemical, Environmental, Bioengineering, and Transport Systems Division from the National Science Foundation for a CAREER grant (CHE-0748612).

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Authors and Affiliations

  1. Department of Chemistry, The University of Toledo, 2801 W. Bancroft Street, Toledo, OH, 43606, USA

    Fei Zhao, Christa M. Graham & Jared L. Anderson

  2. Department of Chemical and Environmental Engineering, The University of Toledo, Toledo, OH, 43606, USA

    Thehazhnan K. Ponnaiyan, Constance A. Schall & Sasidhar Varanasi

Authors
  1. Fei Zhao
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  2. Thehazhnan K. Ponnaiyan
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  3. Christa M. Graham
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  4. Constance A. Schall
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  5. Sasidhar Varanasi
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  6. Jared L. Anderson
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Correspondence to Jared L. Anderson.

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Zhao, F., Ponnaiyan, T.K., Graham, C.M. et al. Determination of ethanol in ionic liquids using headspace solid-phase microextraction–gas chromatography. Anal Bioanal Chem 392, 1271–1275 (2008). https://doi.org/10.1007/s00216-008-2398-9

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  • DOI: https://doi.org/10.1007/s00216-008-2398-9

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