147
Fig. 4.3 Henry’s law constant, K H , for CO 2 in mixtures of [Ch]Cl:U with different molar ratio
compositions ( [Ch]Cl:U (1:1.5), [Ch]Cl:U (1:2), [Ch]Cl:U (1:2.5))
Fig. 4.2 Henry’s law constant, K H , for CO 2 at 303.15 K (*at 308.15 K), H 2 S at 298.15 K (* at
313.2 K), NO at 303.15 K (* at 353.15 K), and SO 2 at 293.15 K. Sulfur dioxide, SO 2 , is the most
soluble of the four gases with reported K H at 293 K lower than 0.18 bar. Notice the large variation
in the range of solubilities for these gases. We observe that 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 mixture. The larger solubilities for NO, H 2 S, and
CO 2 were measured for mixtures based in tetraalkylphosphonium salts. Large solubility of CO 2 in
eutectic mixtures containing amines is likely due to a chemical reaction between these components
and the gas
4 Solubility of Gases in Deep Eutectic Solvents
Fig. 4.3 Henry’s law constant, K H , for CO 2 in mixtures of [Ch]Cl:U with different molar ratio
compositions ( [Ch]Cl:U (1:1.5), [Ch]Cl:U (1:2), [Ch]Cl:U (1:2.5))
Fig. 4.2 Henry’s law constant, K H , for CO 2 at 303.15 K (*at 308.15 K), H 2 S at 298.15 K (* at
313.2 K), NO at 303.15 K (* at 353.15 K), and SO 2 at 293.15 K. Sulfur dioxide, SO 2 , is the most
soluble of the four gases with reported K H at 293 K lower than 0.18 bar. Notice the large variation
in the range of solubilities for these gases. We observe that 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 mixture. The larger solubilities for NO, H 2 S, and
CO 2 were measured for mixtures based in tetraalkylphosphonium salts. Large solubility of CO 2 in
eutectic mixtures containing amines is likely due to a chemical reaction between these components
and the gas
4 Solubility of Gases in Deep Eutectic Solvents