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Abstract— <p>Tightening environmental regulations aimed at minimizing emissions of harmful nitrogen and sulfur oxides require the development of effective methods for the deep purification of petroleum products from heterocyclic compounds. Despite the potential of eutectic solvents as an environmentally friendly alternative to traditional extractants in denitrification and desulfurization processes, their industrial implementation is hampered by technologically unsuitable physicochemical properties and insufficient extraction efficiency for a number of components. The paper proposes a new eutectic solvent based on polyethylene glycol methyl ether with a molecular weight of 350 (PEG ME-350) and tetrabutylammonium bromide (TBAB). The eutectic solvent exhibits physicochemical properties favorable for extraction processes: low viscosity of 68.1 mPa s and high density of 1.08 g/cm<sup>3</sup> under ambient conditions. Compared with industrial N-methylpyrrolidone, the use of the new eutectic solvent leads to a statistically significant increase in the yield of heterocyclic compounds: the increase is 78.8, 6.4, 8.7, and 13.9% for thiophene, indole, quinoline, and pyridine, respectively. The extraction process is characterized by a high speed of achieving thermodynamic equilibrium (within 1 min). The optimal volume ratio of the extractant/raw material phases is 1 : 1. Extraction efficiency is independent of temperature within the studied range, allowing the process to be carried out effectively at 25°C. The distribution coefficients in the system are consistent for all organic compounds across a wide range of initial concentrations, which is particularly important for scaling up the chemical engineering processes.</p>

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Eutectic Solvent Based on Polyethyleneglycol Methyl Ether 350 as an Alternative Extractant in the Processes of Deep Desulfurization and Denitrification of Hydrocarbon Fractions

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • D. V. Lobovich,
  • G. M. Oleshkov,
  • I. V. Zinov’eva,
  • Yu. A. Zakhodyaeva,
  • A. A. Voshkin

摘要

Abstract—

Tightening environmental regulations aimed at minimizing emissions of harmful nitrogen and sulfur oxides require the development of effective methods for the deep purification of petroleum products from heterocyclic compounds. Despite the potential of eutectic solvents as an environmentally friendly alternative to traditional extractants in denitrification and desulfurization processes, their industrial implementation is hampered by technologically unsuitable physicochemical properties and insufficient extraction efficiency for a number of components. The paper proposes a new eutectic solvent based on polyethylene glycol methyl ether with a molecular weight of 350 (PEG ME-350) and tetrabutylammonium bromide (TBAB). The eutectic solvent exhibits physicochemical properties favorable for extraction processes: low viscosity of 68.1 mPa s and high density of 1.08 g/cm3 under ambient conditions. Compared with industrial N-methylpyrrolidone, the use of the new eutectic solvent leads to a statistically significant increase in the yield of heterocyclic compounds: the increase is 78.8, 6.4, 8.7, and 13.9% for thiophene, indole, quinoline, and pyridine, respectively. The extraction process is characterized by a high speed of achieving thermodynamic equilibrium (within 1 min). The optimal volume ratio of the extractant/raw material phases is 1 : 1. Extraction efficiency is independent of temperature within the studied range, allowing the process to be carried out effectively at 25°C. The distribution coefficients in the system are consistent for all organic compounds across a wide range of initial concentrations, which is particularly important for scaling up the chemical engineering processes.