Preparation of [EMIM]DEP/2C₃H₄O₄ DESs and its oxidative desulfurization performance

ABSTRACT

A series of [EMIM]DEP/nC₃H₄O₄ (n = 1, 2, 3) deep eutectic solvents (DESs) were synthesized by heating and stirring the mixture of 1-ethyl-3-methylimidazolium diethylphosphate ([EMIM]DEP) and propanedioic acid (C₃H₄O₄). [EMIM]DEP/2C₃H₄O₄ was characterized by Fourier transform infrared (FT-IR), ¹H nuclear magnetic resonance (¹H NMR), and thermogravimetric analysis (TGA). Dibenzothiophene (DBT) in model oil was removed using the DESs as an extractant and catalyst, and H₂O₂ as an oxidant. The influence parameters of different systems, temperature, n(H₂O₂)/n(S), dosage of [EMIM]DEP/2C₃H₄O₄, and the sulfide type on desulfurization were investigated. The experimental results show that removal rate of DBT can attach to 98.2%. FT-IR analysis of DBT, DESs, and the mixture (DBT-DESs) show that there is an interaction between DBT and DESs.

KEYWORDS:

• Desulfurization
• [EMIM]DEP/2C₃H₄O₄
• DESs

Acknowledgements

The authors also acknowledge the financial support of Liaoning Province Planning Guidance Project (2019-ZD-006).

Additional information

Funding

This work was supported by the Liaoning Province Planning Guidance Project [2019-ZD-006].