Theoretical Foundations of Chemical EngineeringTheoretical Foundations of Chemical EngineeringТеоретические основы химической технологии0040-35713034-6053The Russian Academy of Sciences69815710.7868/S3034605325040065ArticlesСтатьиResearch ArticleEutectic Solvent Based on Polyethylene Glycol Methyl Ester 350 as an Alternative Extractant in Deep Desulfurization and Denitrification Processes of Hydrocarbon FractionsЭВТЕКТИЧЕСКИЙ РАСТВОРИТЕЛЬ НА ОСНОВЕ ПОЛИЭТИЛЕНГЛИКОЛЯ МЕТИЛОВОГО ЭФИРА 350 КАК АЛЬТЕРНАТИВНЫЙ ЭКСТРАГЕНТ В ПРОЦЕССАХ ГЛУБОКОЙ ДЕСУЛЬФУРИЗАЦИИ И ДЕНИТРИФИКАЦИИ УГЛЕВОДОРОДНЫХ ФРАКЦИЙLobovichD. VЛобовичД. Вyz@igic.ras.ruOleshkovG. MОлешковГ. Мyz@igic.ras.ruZinov'evaI. VЗиновьеваИ. Вyz@igic.ras.ruZakhodyaevaYu. AЗаходяеваЮ. Аyz@igic.ras.ruVoshkinA. AВошкинА. Аyz@igic.ras.ruN.S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of SciencesИнститут общей и неорганической химии им. Н.С. Куриакова РАН15082025594VOL 59, NO4 (2025)ТОМ 59, №4 (2025)556608122025Copyright ©; 2025, Russian Academy of SciencesCopyright ©; 2025, Российская академия наук2025Russian Academy of SciencesРоссийская академия наукhttps://transsyst.ru/0040-3571/article/view/698157

The tightening of environmental regulations aimed at minimizing emissions of harmful nitrogen and sulfur oxides requires the development of effective methods for deep purification of petroleum products from heterocyclic compounds. Despite the prospect of eutectic solvents as an environmentally friendly alternative to traditional extractants in denitrification and desulfurization processes, their industrial implementation is hindered by technologically unsuitable physical and chemical properties and insufficient extraction efficiency for a number of components. In this work a new hydrofilic eutectic solvent based on polyethylene glycol methyl ether with molecular weight 350 (PEG ME-350) and tetrabutylammonium bromide (TBAB) was proposed. The eutectic solvent shows favorable physicochemical properties for extraction processes: low viscosity of 68.1 mPa·s and high density of 1.08 g/cm³ at ambient conditions. In comparison with industrial N-methylpyrrolidone, the use of the new eutectic solvent leads to a statistically significant increase in the extraction 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 rate of reaching thermodynamic equilibrium (within 1 min). The optimum volume ratio of extractant/raw material phases is 1 : 1. The extraction efficiency does not depend on temperature in the investigated range, which allows the process to be carried out efficiently at 25°C. The constancy of distribution coefficients in the system for all organic compounds in wide range of their initial concentrations is observed, which is especially important for scaling of chemical-technological processes.

Ужесточение экологических норм, направленных на минимизацию выбросов вредных оксидов азота и серы, требует разработки эффективных методов глубокой очистки нефтепродуктов от гетероциклических соединений. Несмотря на перспективность эвтектических растворителей как экологичной альтернативы традиционным экстрагентам в процессах денитрификации и десульфуризации, их промышленному внедрению препятствуют технологически непригодные физико-химические свойства и недостаточная эффективность извлечения для ряда компонентов. В работе предложен новый гидоофильный эвтектический растворитель на основе полиэтиленгликоля метилового эфира с молекулярной массой 350 (ПЭГ МЭ-350) и тетрабутиламмоний бромида (ТБАБ). Эвтектический растворитель демонстрирует благоприятные для процессов экстракции физико-химические свойства: низкую вязкость 68.1 мПа с и высокую плотность 1.08 г/см3в условиях окружающей среды. В сравнении с промышленным N-метилпирролидоном применение нового эвтектического растворителя приводит к статистически значимому повышению выхода степени извлечения гетероциклических соединений: прирост составляет 78.8, 6.4, 8.7 и 13.9% для тиофена, индола, хинолина и пиридина соответственно. Процесс экстракции характеризуется высокой скоростью достижения термодинамического равновесия (в течение 1 мин). Оптимальное объемное соотношение фаз экстрагент/сырье составляет 1 : 1. Эффективность экстракции не зависит от температуры в исследованном диапазоне, что позволяет проводить процесс эффективно при 25°C. Наблюдается постоянство коэффициентов распределения в системе для всех органических соединений в широком диапазоне их исходных концентраций, что особенно важно для масштабирования химико-технологических процессов.

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