solvent technology, dehydration process, adsorption, desorption, dichloromethane, zeolites, process modeling of chemical technology, Aspen Adsorption, design of processes and apparatus for chemical production


The purpose of this study is to investigate the water desorption stage in the technological process of dichloromethane dehydration and to provide recommendations on the choice of a desorption agent and optimal conditions for its use. The author performed computer modeling in the Aspen Adsorption program, which provided data for comparing the efficiency of using nitrogen and dichloromethane vapor as desorbing agents. The study showed that the use of dichloromethane vapor is characterized by significantly higher energy consumption than the use of nitrogen. This is primarily due to the large amount of energy required to vaporize dichloromethane before it is introduced into the column. In addition, the endothermic nature of the process causes the dichloromethane vapor to condense and form a liquid layer in the column, which increases the desorption time. Therefore, from a technological point of view, nitrogen is a more acceptable desorbing agent than dichloromethane, and desorption should be carried out at temperatures not lower than 80 °C.


Klei A., Moder, M., Stockdale O., Weihe U., Winkler, G. (2017). Digital in chemicals: From technology to impact

Tangsriwong, K., Lapchit, P., Kittijungjit, T., Klamrassamee, T., Sukjai, Y., Laoonual, Y. (2020). Modeling of chemical processes using commercial and open source software: A comparison between Aspen Plus and DWSIM. IOP Conf. Series: Earth and Environmental Science 463, 012057 IOP Publishing

Tian, Y., Demirel, S. E., Hasan, M. M. F., Pistikopoulos, E. N. (2018). An Overview of Process Systems Engineering Approaches for Process Intensification: State of the Art. Chem. Engineering and Processing - Process Intensification, 133, 160–210.

Towler, G., Sinnot, R. (2012). Chemical engineering design: Principles, Practice and Economics of Plant and Process Design, Elsevier Ltd.

Jović, S., Laxminarayan, Ya., Keurentjes, J., Schouten, J., van der Schaaf, J. (2017). Adsorptive Water Removal from Dichloromethane and Vapor-Phase Regeneration of a Molecular Sieve 3A Packed Bed. Ind. Eng. Chem. Res., 56(17), 5042–5054.

Mekala, M., Neerudi, B., Are, P. R., Surakasi, R., Manikandan, G., Kakara, V. R., Abhaykumar, Dhumal, A. A. (2022) Water Removal from an Ethanol-Water Mixture at Azeotropic Condition by Adsorption Technique. Adsorption Science & Technology, 2022, 8374471.

Karimi, S., Yaraki, M., Karri, R. (2019). A comprehensive review of the adsorption mechanisms and factors influencing the adsorption process from the perspective of bioethanol dehydration. Renewable and Sustainable Energy Reviews, 107, 535–553.

Simo, M., Sivashanmugam, S., Brown, C.J., Hlavacek V. (2009). Adsorption/Desorption of Water and Ethanol on 3A Zeolite in Near-Adiabatic Fixed Bed. Ind. Eng. Chem. Res. 2009, 48, 9247–9260.

van Kampen, J., Boon, J. & van Sint Annaland, M. (2021)/ Steam adsorption on molecular sieve 3A for sorption enhanced reaction processes. Adsorption. 2021, 27, 577–589.

Поджарський М. А. (2022), Моделювання адсорбційного видалення води з дихлорметану з використанням програми Aspen Adsorption: стадія адсорбції. Journal of Chemistry and Technologies, 30(3), 441–450

Wood, K. R., Liu, Y. A., Yu, Y. (2018). Design, Simulation, and Optimization of Adsorptive and Chromatographic Separations: A Hands-On Approach, First Edition. Wiley-VCH Verlag GmbH & Co. KGaA.

ES288 Introduction to Aspen Adsorption. AspenTech Customer Education. Training Manual Course Number ES288.071.07. (2009). Aspen Technology, Inc.

Vuc̆elić, V., Dondur, V., Djurdjević, P., Vuc̆elić, D. (1976). An analysis of elementary processes of water desorption from zeolites of type a Part. I. Zeolites with monovalent counterions: undefined. Thermochimica Acta, 14(3), 341–347.

Dondur, V., Vuc̆elić, V., Vuc̆elić, D., S̆us̆ić, M. (1976). An analysis of elementary processes of water desorption from zeolites of type a Part II. Zeolites with bivalent counterions. Thermochimica Acta, 14(3), 349–356.

Palermo, A., Löffler, D. G. (1990). Kinetics of water desorption from pelletized 4A and 5A zeolites Thermochimica Acta, 159, 171–176.

Planovsky, A. N., Ramm, V. M., Kagan, S. E. (1962). [Processes and apparatuses of chemical technology]. Moskow, USSR: Goskhimizdat (in Russian).

Timofeev D. P., Kabanova O. N. (1966). Kinetics of the desorption of water vapors from molded zeolites, types A and X. Bulletin of the Academy of Sciences of the USSR, Division of chemical science volume 15, 610–614.

Ruthven, D. M. (1984). Principles of adsorption and adsorption processes. New York, USA: John Wiley & Songs.

Perez-Pellitero, J., Pirngruber, G. P. Industrial Zeolite Applications for Gas Adsorption and Separation Processes. In S. Valencia, F. Rey (Eds.) (2020), New Developments in Adsorption/Separation of Small Molecules by Zeolites. Springer Nature Switzerland AG.

Saitake, M., Kubota, M., Watanabe, F., Matsuda H. (2007). Enhancement of Water Desorption from Zeolite by Microwave Irradiation. KAGAKU KOGAKU RONBUNSHU, 33(1), 53–58.

Kubota, M., Hanada, T., Yabe, S., Kuchar, D., Matsuda H. (2011). Water desorption behavior of desiccant rotor under microwave irradiation. Applied Thermal Engineering, 31(8–9), 1482–1486.

Smejkal, T., Mikyška, J., Fučík R. (2020). Numerical modelling of adsorption and desorption of water vapor in zeolite 13X using a two-temperature model and mixed-hybrid finite element method numerical solver. International Journal of Heat and Mass Transfer, 148(2),

Drying by adsorption.

Voc Treatment System Adsorption - Hot Nitrogen Desorption Type Vapor Recovery Unit.

Li, Y., Shen, Y., Niu, Z., Tian, Y., Zhang, D., Tang, Z., Li, W. (2023), Process analysis of temperature swing adsorption and temperature vacuum swing adsorption in VOCs recovery from activated carbon. Chinese Journal of Chemical Engineering, 53, 346–360.