Influence of the Interaction between Hydrogen Sulfide and Ionic Liquids on Solubility:  Experimental and Theoretical Investigation

Abstract

The solubility of H(2)S in a series of 1-butyl-3-methylimidazolium ([bmim](+)) based ionic liquids (ILs) with different anions, chloride, tetrafluoroborate ([BF(4)](-)), hexafluorophosphate ([PF(6)](-)), triflate ([TfO](-)), and bis(trifluoromethyl)sulfonylimide ([Tf(2)N]-), and in a series of [Tf(2)N] ILs with different cations, i.e., N-alkyl-N'-methylimidazolium, 2-methyl-N-methyl-N'-alkyimidazolium, N-alkylpyridinium, N-butyl-N-methylpyrrolidinium, and N-alkyl-N,N-dimethyl-N-(2-hydroxyethyl)ammonium has been determined using medium-pressure NMR spectroscopy. The observed solubilities are significantly higher than those reported for many other gases in ILs, suggesting the occurrence of specific interactions between H2S and the examined ILs. Quantum chemical calculations have been used to investigate at a molecular level the interaction between H2S and the [bmim](+)-based ILs.

Solubility and diffusion of CO2 and H2S in the ionic liquid 1-ethyl-3-methylimidazolium ethylsulfate

“…It can be seen that the solubility of both gases in the IL decreases by increasing the temperature and hydrogen sulfide is more soluble (about 1.5 times) than carbon dioxide in the IL studied in this work. This observation may be explained on the basis of the fact that H 2 S tends to interact more energetically than CO 2 with the anion part of IL via forming hydrogen bond [20]. The solubility curves also indicate that the solubility of H 2 S and CO 2 in the IL studied in this work are typical of those of physical solvents [21], therefore obeying the Henry's law.…”

“…However, experimental data for the solubility and diffusion of hydrogen sulfide in ILs are scarce. Besides the data reported by Jou and Mather [19] for the solubility of H 2 S in 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim] [PF 6 ]) at temperatures from (298.15 to 403.15) K and pressures up to 9.6 MPa and those reported by Pomelli et al [20] for the solubility of H 2 S in different [bmim] + -based ILs with different anions and in a series of bis-(trifluoromethyl)sulfonylimide ([Tf 2 N] À ) ILs with different cations at T = 298.15 K and 1400 kPa, the remaining data have been produced in our laboratory at temperatures ranging from (303. 15 [24].…”

The Mediated Detection of Hydrogen Sulfide in Room Temperature Ionic Liquids

“…It is naturally present in oil and gas wells which necessitates the separation of H 2 S from petroleum refinery and coal gasification processes [3]. Amperometric sensors are used commercially and many conventional sensors for H 2 S detection employ aqueous electrolyte (usually a H 2 SO 4 /H 2 O mixture) [5].…”

Effect of Water Content on Properties of Homogeneous [bmim]Fe(III)Cl4–H2O Mixtures and Their Application in Oxidative Absorption of H2S

“…As soon as H2S was absorbed, it was oxidized. In addition, many researchers have observed a high solubility of H2S in a series of 1-butyl-3-methylimidazolium ([bmim] + )-based ionic liquids due to the formation of H2S-Cl − or other complexes [33][34][35]. It can be seen from Table 1 that the concentration of iron(III) in mixtures is very high in comparison with chelated iron solutions [36].…”