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[Et3NH][HSO4] as an efficient and inexpensive ionic liquid catalyst for the scalable preparation of biorenewable chemicals

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Abstract

Triethylammonium hydrogen sulfate (TEAHS) has been employed as an inexpensive protic ionic liquid catalyst for the preparation of various biomass-derived renewable compounds. TEAHS efficiently catalyzed the esterification of biomass-derived chemical intermediates such as levulinic acid, 2-furoic acid, stearic acid, and isosorbide. The scalable, cosolvent-free preparations were conducted in a batch-type glass pressure reactor, which provided excellent yields (> 80%) of the esters under moderate conditions. The TEAHS catalyst was conveniently separated from the reaction mixture and reused without significant loss of activity.

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Acknowledgments

The authors want to thank TIFR, Hyderabad for collecting NMR (1H and 13C) samples.

Funding

This study is financially supported by Science and Engineering Research Board (SERB), India, under the grant number YSS/2015/001649 and Vision Group of Science and Technology (VGST) Project No. KSTePS/VGST-RGS-F/2018-19/GRD No. 806/315.

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Authors and Affiliations

  1. Department of Chemistry, National Institute of Technology Karnataka (NITK), Surathkal, Mangalore, Karnataka, 575025, India

    Navya Subray Bhat, Sib Sankar Mal & Saikat Dutta

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  1. Navya Subray Bhat
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Correspondence to Saikat Dutta.

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The details of the spectroscopic characterization (FTIR, 1H-NMR, 13C-NMR) of the synthesized compounds, and the TEAHS catalyst recovery are provided as supporting information. (PDF 1.89 mb)

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Bhat, N.S., Mal, S.S. & Dutta, S. [Et3NH][HSO4] as an efficient and inexpensive ionic liquid catalyst for the scalable preparation of biorenewable chemicals. Biomass Conv. Bioref. 12, 5619–5625 (2022). https://doi.org/10.1007/s13399-020-01052-x

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