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Microwave-Assisted Ionic Liquid Extraction of n-Alkanes and Isoprenoid Hydrocarbons from Petroleum Source Rock

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Abstract

Microwave-assisted ionic liquid extraction (MAILE) has been investigated for the extraction of n-alkanes and isoprenoid hydrocarbons from petroleum source rock and the conditions for maximum yield of the analytes were determined. An aqueous solution of an ionic liquid, 1-butyl-3-methylimidazolium bromide (BmimBr), was employed as the extracting medium. The results showed that the concentration of ionic liquid, extraction time and extraction temperatures have effects on extraction yields of aliphatic hydrocarbons with optimal conditions at: 3.0 mol L−1 ionic liquid solution, 30 min and 120 °C, respectively. The extraction yields of all the n-alkanes and acyclic isoprenoid hydrocarbons were much higher using microwave-assisted ionic liquid extraction than with Soxhlet extraction and accelerated solvent extraction. There were good correlations of the diagnostic geochemical ratios calculated from the gas chromatographic (GC) data of MAILE, Soxhlet extraction and accelerated solvent extraction. The results of this study show that MAILE is an efficient and green analytical preparatory technique for geochemical evaluation of petroleum source rock.

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Acknowledgments

We thank German Academic Exchange Service (DAAD) for travel Grant awarded to A. Akinlua for research visit to University of Duisburg-Essen, Germany where this study was carried out. We also thank Prof. Dr. Oliver Schmitz for allowing us to use his microwave. The assistance of Maria Madani is gratefully appreciated.

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Authors and Affiliations

  1. Fossil Fuels and Environmental Geochemistry Group, Department of Chemistry, Obafemi Awolowo University, Ile-Ife, Nigeria

    Akinsehinwa Akinlua

  2. Instrumental Analytical Chemistry, University Duisburg-Essen, Universitätsstr. 5, 45141, Essen, Germany

    Maik A. Jochmann & Torsten C. Schmidt

Authors
  1. Akinsehinwa Akinlua
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  2. Maik A. Jochmann
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  3. Torsten C. Schmidt
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Correspondence to Akinsehinwa Akinlua.

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Akinlua, A., Jochmann, M.A. & Schmidt, T.C. Microwave-Assisted Ionic Liquid Extraction of n-Alkanes and Isoprenoid Hydrocarbons from Petroleum Source Rock. Chromatographia 78, 1201–1209 (2015). https://doi.org/10.1007/s10337-015-2939-2

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  • DOI: https://doi.org/10.1007/s10337-015-2939-2

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