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An insight into the CO2 solubility in NaCl + ethylene glycol (1:16) deep eutectic solvent
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Resumo(s)
The regulation of CO₂ emissions from industrial operations is crucial from an environmental perspective. The most widely used solvents for CO₂ capture consist of aqueous alkanolamine solutions. However, amine-based processes face several challenges, such as corrosion, chemical degradation, and high energy requirements for solvent regeneration. As potential alternatives, deep eutectic solvents (DESs) have emerged as promising eco-friendly and biodegradable options for CO₂ capture. This study experimentally measures the solubility of CO₂ in a DES (1 mol NaCl + 16 mol ethylene glycol) using a high-pressure solubility apparatus at the four temperatures of 293.15, 303.15, 313.15, and 323.15 K. For the thermodynamic modeling, the Soave Redlich Kwong equation of state (SRK EoS) was employed, coupled with three different mixing rules of van der Waals (vdW), Wong Sandler (WS), and modified Huron-Vidal (MHV1). The vdW approach was considered in the three cases without using binary interaction, constant binary interaction, and variable binary interaction parameter by temperature. The results demonstrated that by incorporating the WS and MHV1, the local composition concept was successful in addressing the non-ideality of the liquid phase. Among the tested models, the WS (AARD%=6.66) and MHV1 (AARD%=5.61) provided the most accurate predictions of equilibrium pressures. Additionally, Henry's constant, standard Gibbs energy, enthalpy, and entropy of gas solvation were determined using the experimental data together with classical thermodynamic relations. The calculated negative standard enthalpy of solvation indicates an exothermic gas solvation process, signifying that energy is released as CO₂ dissolves in this DES.
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Funding Information:
The authors are grateful to Shiraz University for providing facilities. Also, the parts of the research which were carried out at Universidade Nova de Lisboa. This work was financed by national funds from FCT - Fundação para a Ciência e a Tecnologia, I.P., under the scope of the project UID/50006/2023 of the Associate Laboratory for Green Chemistry - LAQV REQUIMTE and through national funds by CEEC IND5ed (DOI 10.54499/2022.05803.CEECIND/CP1725/CT0003).
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© 2025
Palavras-chave
Carbon capture Carbon dioxide Green solvent Thermodynamic modeling Vapor–liquid equilibria General Engineering