chemicallytechFine Chemical TechnologiesТонкие химические технологии2410-65932686-7575MIREA – Russian Technological University (RTU MIREA).10.32362/2410-6593-2025-20-2-95-106XRBSSOchemicallytech-2233Research ArticleTHEORETICAL BASIS OF CHEMICAL TECHNOLOGYТЕОРЕТИЧЕСКИЕ ОСНОВЫ ХИМИЧЕСКОЙ ТЕХНОЛОГИИExtractive distillation of tetrahydrofuran–ethyl acetate–water mixture in schemes including columns with side sections and side drawsЭкстрактивная ректификация смеси тетрагидрофуран–этилацетат–вода в схемах, включающих колонны с боковыми секциями и отборамиhttps://orcid.org/0000-0002-9892-7909РудаковД. Г.RudakovD. G.

Рудаков Данила Григорьевич, к.т.н., доцент кафедры химии и технологии основного органического синтеза

Scopus Author ID 37018548000, ResearcherID M-5241-2014

119454, Россия, Москва, пр-т Вернадского, д. 78

Danila G. Rudakov, Cand. Sci. (Eng.), Associate Professor, Department of Chemistry and Technology of Basic Organic Synthesis

ScopusAuthorID 37018548000, ResearcherID M-5241-2014

78, Vernadskogo pr., Moscow, 119454

rudakov@mirea.ruhttps://orcid.org/0000-0003-4470-6323ХарламовС. М.KharlamovS. M.

Харламов Сергей Максимович, студент

119454, Россия, Москва, пр-т Вернадского, д. 78

Sergey M. Kharlamov, Student

78, Vernadskogo pr., Moscow, 119454

sergeykharlamov.79@gmail.comhttps://orcid.org/0000-0001-5844-549XКлаузнерП. С.KlauznerP. S.

Клаузнер Павел Сергеевич, к.т.н., ассистент, кафедра химии и технологии основного органического синтеза

ResearcherID AAJ-7842-2021

119454, Россия, Москва, пр-т Вернадского, д. 78

Pavel S. Klauzner, Cand. Sci. (Eng.), Assistant, Department of Chemistry and Technology of Basic Organic Synthesis

ResearcherID AAJ-7842-2021

78, Vernadskogo pr., Moscow, 119454

klauzner@mirea.ruАнохинаЕ. А.AnokhinaE. A.

Анохина Елена Анатольевна, д.т.н., профессор кафедры химии и технологии основного органического синтеза

Scopus Author ID 6701718055, ResearcherID E-5022-2016

119454, Россия, Москва, пр-т Вернадского, д. 78

Elena A. Anokhina, Dr. Sci. (Eng.), Professor, Department of Chemistry and Technology of Basic Organic Synthesis

Scopus Author ID 6701718055, ResearcherID E-5022-2016

78, Vernadskogo pr., Moscow, 119454

anokhina.ea@mail.ruhttps://orcid.org/0000-0002-6511-7440ТимошенкоА. В.TimoshenkoA. V.

Тимошенко Андрей Всеволодович, д.т.н., профессор кафедры химии и технологии основного органического синтеза

Scopus Author ID 56576076700, ResearcherID Y-8709-2018

119454, Россия, Москва, пр-т Вернадского, д. 78

Andrey V. Timoshenko, Dr.Sci. (Eng.), Professor, Department of Chemistry and Technology of Basic Organic Synthesis

Scopus Author ID 56576076700, ResearcherID Y-8709-2018

78, Vernadskogo pr., Moscow, 119454

timoshenko@mirea.ruМИРЭА – Российский технологический университет (Институт тонких химических технологий им. М. В. Ломоносова)РоссияMIREA – Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)Russian Federation20250605202520295106Copyright © Rudakov D.G., Kharlamov S.M., Klauzner P.S., Anokhina E.A., Timoshenko A.V., 20252025Рудаков Д.Г., Харламов С.М., Клаузнер П.С., Анохина Е.А., Тимошенко А.В.Rudakov D.G., Kharlamov S.M., Klauzner P.S., Anokhina E.A., Timoshenko A.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.finechem-mirea.ru/jour/article/view/2233Objectives

Objectives. The work set out to evaluate the energy efficiency of using schemes including columns with side sections and side draws in the extractive distillation of tetrahydrofuran–ethyl acetate–water mixture with dimethyl sulfoxide as an entrainer.

Methods

Methods. The main research method consisted of a computational experiment with the Aspen Plus v. 12 software package. The local composition UNIQUAC equation model was used for describing vapor–liquid equilibrium. Parametric optimization of initial scheme and schemes, including columns with side sections and side draws, was carried out according to the criterion of energy consumptions in distillation columns reboilers.

Results

Results. Two variants ofschemes including partially thermally coupled distillation columns and two variants ofschemes including columns with side draws were synthesized on the basis of the conventional scheme of double extractive distillation consisting of two-withdrawal columns using the graph method. The optimal operating parameters of the conventional scheme and all schemes obtained on its basis were determined. The schemes, including columns with side draw, were modeled in two variants, namely, in the vapor phase with side draw, and in the liquid phase. The energy efficiency of the proposed schemes was evaluated in comparison with the conventional scheme.

Conclusions

Conclusions. The phase state of the side draw is shown to have little effect on the total energy consumption in column reboilers, the amount of liquid-phase side draw being 1.4–5.2 times greater than that of vapor-phase draw. Among the schemes including complex columns with a side section, the maximum reduction of energy consumption by 5.9% in relation to the scheme of two-withdrawal columns is provided by the scheme according to which the thermal coupling between the second extractive column and the regeneration column of the entrainer is realized. Thermal coupling of extractive columns provides a significantly lower energy saving (1.36%). Among the schemes including complex columns with side draw, the greatest energy efficiency (5.9%) is characterized by the scheme in which the draw in the vapor phase is taken from the second extractive column to the regeneration column.

Цели

Цели. Провести оценку энергетической эффективности применения схем, включающих колонны с боковыми секциями и отборами, в процессе экстрактивной ректификации смеси тетрагидрофуран–этилацетат–вода с диметилсульфоксидом в качестве разделяющего агента.

Методы

Методы. Основным методом исследования являлся вычислительный эксперимент, реализуемый с применением программного комплекса Aspen Plus v. 12. Для моделирования парожидкостного равновесия было использовано уравнение локальных составов UNIQUAC. Параметрическая оптимизация всех рассмотренных в работе схем экстрактивной ректификации выполнялась по критерию суммарных энергетических затрат в кипятильниках колонн.

Результаты

Результаты. С применением метода графов на основе базовой схемы двухступенчатой экстрактивной ректификации, состоящей из двухотборных колонн, синтезировано два варианта схем, включающих комплексы с частично связанными тепловыми и материальными потоками, и два варианта схем, включающих колонны с боковым отбором. Определены оптимальные рабочие параметры базовой схемы, а также всех полученных на ее основе схем. Схемы, включающие колонны с боковыми отборами, смоделированы в двух вариантах, а именно: с отбором бокового потока в паровой и в жидкой фазах. Проведена оценка энергоэффективности предложенных схем по сравнению с базовой схемой.

Выводы

Выводы. Выявлено, что фазовое состояние бокового отбора мало влияет на суммарные энергозатраты в кипятильниках колонн, при этом количество жидкофазного бокового потока в 1.4–5.2 раза больше, чем парофазного. Установлено, что среди схем, включающих сложные колонны с боковой секцией, максимальное снижение энергозатрат на 5.9% относительно схемы из двухотборных колонн обеспечивает схема, в которой реализуется термическая связь между второй экстрактивной колонной и колонной регенерации разделяющего агента. Термическое связывание экстрактивных колонн дает существенно меньшую экономию энергозатрат (1.36%). Среди схем, включающих сложные колонны с боковым отбором, наибольшей энергоэффективностью (5.9%) характеризуется схема, в которой осуществляется отбор потока в паровой фазе из второй экстрактивной колонны в колонну регенерации.

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The authors declare that there are no conflicts of interest present.