Abstract
The conversion of oil shale into value-added products is a challenging goal for chemistry and chemical engineering. There exists an urgent need for the development of efficient processes that are capable of providing useful products, such as alternative synthetic fuels or high-quality chemical feedstock. The first step in the development of such processes is the development of efficient means to characterise the various components of the shales.
We have examined the use of two different types of ionic liquids for their ability to extract organic compounds, particularly oxygenated compounds, from Estonian oil shale kerogen. 1-Buty1-3-methylimidazolium hexafluorophosphate, [bmim][PF6], and 1-buty1-3-methylimidazolium tetrachloroaluminate, [brnim][AlCl4], were synthesised and applied to the kerogen extraction at various temperatures. In addition, the effect of Lewis acidity of the chloroaluminate salt was examined by varying the AlCl3:[bmim]Cl ratio.
At room temperature, mere was no evidence of extraction from the kerogen using either ionic liquid. However, these chemical processes are favoured at elevated temperatures, up to the thermal degradation temperature of kerogen, ≈400 °C. As expected, at 175 °C, the extraction yield of soluble products was increased ten times over that obtained using conventional organic solvents, such as hexane and dichloromethane. We also observed significant differences in the extraction behaviour between different types of Estonian oil shale, because of the unique chemical composition and structure of their organic components.
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Koel, M., Hollis, K., Rubin, J., Lombardo, T., Smith, B. (2003). Ionic Liquids for Oil Shale Treatment. In: Rogers, R.D., Seddon, K.R., Volkov, S. (eds) Green Industrial Applications of Ionic Liquids. NATO Science Series, vol 92. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0127-4_11
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DOI: https://doi.org/10.1007/978-94-010-0127-4_11
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