Solubility of Gases in Deep Eutectic Solvents

Leila Moura, Laura Kollau, Margarida F. Costa Gomes*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapter (peer-reviewed)peer-review


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 (CO2), carbon monoxide (CO), nitric oxide (NO), nitrogen dioxide (NO2), hydrogen (H2), hydrogen sulfide (H2S), sulfur dioxide (SO2), nitrogen (N2), ammonia (NH3), and methane (CH4). The gas solubility studies were performed using either saturation or gravimetric techniques. Carbon dioxide is the most studied gas so far, followed by SO2 and NH3. Although for some gases the absorption process is only physical, e.g., N2, CO, and CH4, for others it was reported to be both physical and chemical, e.g., SO2, NO, and CO2. The solubility of the most commonly studied gases varies in the order SO2 > NO > CO2 > H2S, the larger absorption for SO2 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, H2S, and CO2 were measured for mixtures based in tetraalkylphosphonium salts, with Henry’s law constants typically below 0.20 bar at 303 K. Eutectic mixtures containing amines are also reported as excellent absorbers of CO2, this behavior being probably explained by a chemical reaction between the gas and these components of the eutectic mixture.
Original languageEnglish
Title of host publicationDeep Eutectic Solvents for Medicine, Gas Solubilization and Extraction of Natural Substances
EditorsSophie Fourmentin, Margarida Costa Gomes, Eric Lichtfouse
ISBN (Electronic)9783030530693
ISBN (Print)9783030530686
Publication statusPublished - 20 Oct 2020

Publication series

NameEnvironmental Chemistry for a Sustainable World
ISSN (Print)2213-7114
ISSN (Electronic)2213-7122


  • Deep eutectic solvent
  • carbon dioxide
  • Sulfur dioxide
  • Ammonia
  • carbon monoxide
  • nitric oxide
  • Nitrogen dioxide
  • Hydrogen
  • hydrogen sulfide
  • Nitrogen
  • methane


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