Gas Solubility Using Deep Eutectic Solvents: Review and Analysis

Abstract

The increasing global levels of anthropogenic greenhouse gases (GHGs), especially CO 2 emissions, have caused environmental problems that impact humanity and the ecosystems. Therefore, gas capture and storage are a feasible solution to this global issue. Some aqueous amine solutions, such as monoethanolamine (MEA), have been used to capture GHGs, but they are not environment friendly. Research on greener solvents for this task led to deep eutectic solvents (DESs) as a novel option. This review explores the applications of different DESs; compares the differences between gas solubility methodologies; and studies the interference of the DESs' molar ratio, the influence of HBA and HBD, and the differences between the solubility of some gases in these solvents. More than 40 DESs have been analyzed; however, some gaps need to be filled, such as data for gas solubility under higher pressures and thermodynamic modeling of experimental data.

Computer Simulations of Deep Eutectic Solvents: Challenges, Solutions, and Perspectives

“…DESs are often classified as cheap, non-toxic, and environmentally friendly analogues of ionic liquids (ILs); see, e.g., Amde, Liu, and Pang [ 6 ] for a review regarding environmental aspects of ILs. DESs have indeed shown great potential for nanotechnology [ 7 ], electrochemistry [ 8 ], extraction processes [ 9 ], biomass transformation [ 10 ], additive technology [ 11 , 12 ], pharmaceuticals [ 13 , 14 ], biosensor development [ 15 ], membrane technology [ 16 , 17 ], and many other applications.…”

“…For example, Kaur et al [ 39 ] reviewed the research on microstructure and devoted part of the review to simulations of DES structures. Pelaquim et al [ 17 ], Liu et al [ 16 ], and Shama et al [ 40 ] have provided overviews of studies devoted to modeling gas solubility in DESs. De Castilla et al [ 41 ] discussed research on simulating thermodynamic and transport properties of DESs in their review.…”

Simulation of deep eutectic solvents: Progress to promises

“…16 Accordingly, DES physicochemical properties are primarily dependent upon the intermolecular interactions maintained by its components 17 . Capitalizing on their facile synthesis and purification process, favorable physical properties that include low vapor pressures, nonflammability, high biodegradability, and their 100% atom utilization rate, 18 deep eutectic solvents have been effectively adopted for use in multiple fields that include biotechnology and biocatalysis, 19,20 materials, 21–23 polymers, 24–27 extractions and separations, 28–32 dissolution of metals, 33 carbohydrate chemistry, 34 gas solubility, 35,36 energy and fuels, 37,38 biology, 39 biomass processing, 40,41 and as a reaction medium for organic reactions 42–44 …”

“…16 Accordingly, DES physicochemical properties are primarily dependent upon the intermolecular interactions maintained by its components. 17 Capitalizing on their facile synthesis and purification process, favorable physical properties that include low vapor pressures, nonflammability, high biodegradability, and their 100% atom utilization rate, 18 deep eutectic solvents have been effectively adopted for use in multiple fields that include biotechnology and biocatalysis, 19,20 materials, [21][22][23] polymers, [24][25][26][27] extractions and separations, [28][29][30][31][32] dissolution of metals, 33 carbohydrate chemistry, 34 gas solubility, 35,36 energy and fuels, 37,38 biology, 39 biomass processing, 40,41 and as a reaction medium for organic reactions. [42][43][44] While many DES-based enhancements to chemical applications have been realized, meaningfully advancing the "designer solvent" aspect of DESs through their virtually limitless synthetic flexibility 45 can be as much a hindrance as a benefit given the expense and time-required to perform large-scale experimental measurements.…”

CO2 Absorption Mechanism by the Deep Eutectic Solvents Formed by Monoethanolamine-Based Protic Ionic Liquid and Ethylene Glycol

“…The applications of DESs in many fields have been investigated so far, such as organic synthesis, extractions processes, catalytic reactions and electrochemistry [3][4][5][6]. Moreover, DESs have been widely studied as absorbents for CO 2 capture [7][8][9][10][11]. Among them, functional DESs which could chemically absorb CO 2 have received much attention because of their high capacities.…”