131
© The Editor(s) (if applicable) and The Author(s), under exclusive license to
Springer Nature Switzerland AG 2021
S. Fourmentin et al. (eds.), Deep Eutectic Solvents for Medicine, Gas
Solubilization and Extraction of Natural Substances, Environmental Chemistry
for a Sustainable World 56, https://doi.org/10.1007/978-3-030-53069-3_4
Chapter 4
Solubility of Gases in Deep Eutectic
Solvents
Leila Moura, Laura Kollau, and Margarida Costa Gomes
Contents
4.1 Introduction
134
4.2 Experimental Methods
144
4.3 Gas Solubilities
145
4.4 Conclusions
150
References
151
Abstract Deep eutectic solvents are promising alternative media for more sustainable chemistry and chemical engineering. The way they dissolve gases provides
valuable information about solvation mechanisms but also points the way to new
applications of these interesting liquid mixtures. Here we review the solubility of 10
permanent gases in 87 deep eutectic solvents: carbon dioxide (CO 2 ), carbon monoxide (CO), nitric oxide (NO), nitrogen dioxide (NO 2 ), hydrogen (H 2 ), hydrogen sulfide (H 2 S), sulfur dioxide (SO 2 ), nitrogen (N 2 ), ammonia (NH 3 ), and methane (CH 4 ).
The gas solubility studies were performed using either saturation or gravimetric
techniques. Carbon dioxide is the most studied gas so far, followed by SO 2 and NH 3 .
Although for some gases the absorption process is only physical, e.g., N 2 , CO, and
CH 4 , for others it was reported to be both physical and chemical, e.g., SO 2 , NO, and
CO 2 . The solubility of the most commonly studied gases varies in the order
SO 2 > NO > CO 2 > H 2 S, the larger absorption for SO 2 being reported for the common choline chloride:urea mixtures with Henry’s law constant lower than 0.18 bar
at 293 K. The larger solubilities for NO, H 2 S, and CO 2 were measured for mixtures
based in tetraalkylphosphonium salts, with Henry’s law constants typically below
L. Moura
School of Chemistry and Chemical Engineering, QUILL, Queen’s University Belfast,
Belfast, UK
e-mail: L.Moura@qub.ac.uk
L. Kollau · M. C. Gomes (*)
Chemistry Laboratory ENS Lyon, CNRS & Lyon University, Lyon, France
e-mail: laura.kollau@ens-lyon.fr; margarida.costa-gomes@ens-lyon.fr
© The Editor(s) (if applicable) and The Author(s), under exclusive license to
Springer Nature Switzerland AG 2021
S. Fourmentin et al. (eds.), Deep Eutectic Solvents for Medicine, Gas
Solubilization and Extraction of Natural Substances, Environmental Chemistry
for a Sustainable World 56, https://doi.org/10.1007/978-3-030-53069-3_4
Chapter 4
Solubility of Gases in Deep Eutectic
Solvents
Leila Moura, Laura Kollau, and Margarida Costa Gomes
Contents
4.1 Introduction
134
4.2 Experimental Methods
144
4.3 Gas Solubilities
145
4.4 Conclusions
150
References
151
Abstract Deep eutectic solvents are promising alternative media for more sustainable chemistry and chemical engineering. The way they dissolve gases provides
valuable information about solvation mechanisms but also points the way to new
applications of these interesting liquid mixtures. Here we review the solubility of 10
permanent gases in 87 deep eutectic solvents: carbon dioxide (CO 2 ), carbon monoxide (CO), nitric oxide (NO), nitrogen dioxide (NO 2 ), hydrogen (H 2 ), hydrogen sulfide (H 2 S), sulfur dioxide (SO 2 ), nitrogen (N 2 ), ammonia (NH 3 ), and methane (CH 4 ).
The gas solubility studies were performed using either saturation or gravimetric
techniques. Carbon dioxide is the most studied gas so far, followed by SO 2 and NH 3 .
Although for some gases the absorption process is only physical, e.g., N 2 , CO, and
CH 4 , for others it was reported to be both physical and chemical, e.g., SO 2 , NO, and
CO 2 . The solubility of the most commonly studied gases varies in the order
SO 2 > NO > CO 2 > H 2 S, the larger absorption for SO 2 being reported for the common choline chloride:urea mixtures with Henry’s law constant lower than 0.18 bar
at 293 K. The larger solubilities for NO, H 2 S, and CO 2 were measured for mixtures
based in tetraalkylphosphonium salts, with Henry’s law constants typically below
L. Moura
School of Chemistry and Chemical Engineering, QUILL, Queen’s University Belfast,
Belfast, UK
e-mail: L.Moura@qub.ac.uk
L. Kollau · M. C. Gomes (*)
Chemistry Laboratory ENS Lyon, CNRS & Lyon University, Lyon, France
e-mail: laura.kollau@ens-lyon.fr; margarida.costa-gomes@ens-lyon.fr