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Boric acid-based ternary deep eutectic solvent for extraction and oxidative desulfurization of diesel fuel

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Abstract

Deep eutectic solvents (DESs) have been intensively investigated as promising “green” solvents for a range of industrial processes, although most research continues to be focused on binary DESs. This paper reports on a class of ternary DESs formed by choline chloride (ChCl), polyethylene glycol (PEG), and boric acid (BA) that may be viewed as a new system for extraction and oxidative desulfurization (ODS) of diesel fuel. Compared with organic acid-based DESs, ternary DESs offer advantages including low volatility, low toxicity, and high activity. After tuning the molar ratio of the three compositions, sulfur removal reached 99.2% in 2 h at 60 °C when the molar ratio of H2O2 to dibenzothiophene was 6. The binary DESs, ChCl/PEG and ChCl/BA, showed unsatisfactory extraction and oxidation efficiency. The reaction mechanism identified through experimental and theoretical methods showed that superoxide radical may be the main active oxygen species, and BA-based peroxides may also play an important role. The results of this study may expand the use of BA and supply a new class of DESs for ODS and other possible applications.

Graphical abstract: Boric acid-based ternary deep eutectic solvent for extraction and oxidative desulfurization of diesel fuel

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Publication details

The article was received on 27 Mar 2019, accepted on 09 May 2019 and first published on 09 May 2019


Article type: Paper
DOI: 10.1039/C9GC01004A
Green Chem., 2019, Advance Article

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    Boric acid-based ternary deep eutectic solvent for extraction and oxidative desulfurization of diesel fuel

    W. Jiang, H. Jia, H. Li, L. Zhu, R. Tao, W. Zhu, H. Li and S. Dai, Green Chem., 2019, Advance Article , DOI: 10.1039/C9GC01004A

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