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Issue 7, 2015
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An ionic liquid extraction process for the separation of indole from wash oil

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Abstract

Indole is an important industrial substance derived from wash oil, and the traditional alkali fusion method causes serious environmental problems. In this research, imidazolium-based ionic liquids (IBILs) were developed as new extraction agents to separate indole from wash oil with extraction efficiencies of more than 90%. The influence of the IBIL structure was explored. The extraction efficiency and the distribution coefficient of indole were used as the indexes to evaluate the IBIL extraction ability. The key experimental parameters, such as the initial indole concentration, extraction time, extraction temperature, and volume ratio of IBIL-to-model wash oil, were investigated to obtain the optimum conditions. The separation mechanism was studied by analyzing the chemical bonds using spectrographic analysis and molecular simulations. The IBILs were recycled by back-extraction and they exhibited good recycling properties with no obvious reduction and a high extraction efficiency. Finally, the optimal process was conducted based on the process simulation.

Graphical abstract: An ionic liquid extraction process for the separation of indole from wash oil

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Publication details

The article was received on 16 Jan 2015, accepted on 24 Mar 2015 and first published on 27 Mar 2015


Article type: Paper
DOI: 10.1039/C5GC00081E
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Green Chem., 2015,17, 3783-3790

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    An ionic liquid extraction process for the separation of indole from wash oil

    T. Jiao, X. Zhuang, H. He, L. Zhao, C. Li, H. Chen and S. Zhang, Green Chem., 2015, 17, 3783
    DOI: 10.1039/C5GC00081E

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