The use of deep eutectic solvents (DES) as “green” solvents could solve at least some of the environmental problems associated with the chemical and petrochemical industry. This paper investigates the applicability of DES made of choline chloride and propylene glycol in a molar ratio of 1:3 for the removal of sulfur and nitrogen compounds from hydrocarbon mixtures. Extraction experiments were performed in quasi-three-component systems, quasi-seven-component model systems and real fuel systems. All the experiments confirmed better solubility of pyridine (compared to thiophene) and nitrogen compounds (compared to sulfur ones) in the investigated DES, indicating its potential use as a denitrification agent. The basic application physico-chemical properties of the investigated DES were determined. Its applicability in multistage extraction processes was confirmed, its extraction capacity was determined and the ability of its regeneration by evaporation was demonstrated. Liquid–liquid equilibria in investigated quasi-three-component systems were described successfully by UNIQUAC activity coefficient model.

使用深共熔溶剂（DES）作为“绿色”溶剂可以解决至少一些与化学和石化工业相关的环境问题。本文研究了由氯化胆碱和丙二醇（摩尔比为1：3）制成的DES用于从烃混合物中脱除硫和氮化合物的适用性。提取实验在准三组分系统，准七组分模型系统和实际燃料系统中进行。所有实验均证实吡啶（与噻吩相比）和含氮化合物（与硫化合物相比）在所研究的DES中具有更好的溶解度，表明其可能用作反硝化剂。确定了所研究DES的基本应用理化性质。证实了其在多级萃取过程中的适用性，确定了其萃取能力，并证明了其通过蒸发再生的能力。通过UNIQUAC活度系数模型成功地描述了所研究的准三组分系统中的液-液平衡。