Solubility of CO2 and CH4 in Protic Amidium Bis(trifluoromethanesulfonyl)amide Ionic Liquids at 313.15 K
In this study, we investigated the CO2/CH4 selectivity of protic amidium ionic liquids (ILs) comprising bis(trifluoromethanesulfonyl)amide, N,N-dimethylformamidium ([DMFH][TFSA]), N,N-dimethylacetamidium ([DMAH][TFSA]), and N,N-dimethylpropionamidium ([DMPH][TFSA]). CO2 solubility was measured...
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Veröffentlicht in: | Journal of chemical and engineering data 2022-05, Vol.67 (5), p.1157-1163 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | In this study, we investigated the CO2/CH4 selectivity of protic amidium ionic liquids (ILs) comprising bis(trifluoromethanesulfonyl)amide, N,N-dimethylformamidium ([DMFH][TFSA]), N,N-dimethylacetamidium ([DMAH][TFSA]), and N,N-dimethylpropionamidium ([DMPH][TFSA]). CO2 solubility was measured at a temperature of 313.15 K and pressures up to 8.3 MPa using a static circulation-type apparatus, whereas CH4 solubility was measured at a temperature of 313.15 K and pressures up to 8.0 MPa using a magnetic suspension balance. The CO2 and CH4 solubility in the ILs exhibited typical pressure dependence as observed for physical absorbents. [DMFH][TFSA] exhibited a higher CO2 solubility and a lower CH4 solubility than [DMAH][TFSA] and [DMPH][TFSA]. CO2/CH4 selectivity was derived from the experimental solubility data. The protic amidium ILs presented herein exhibited higher CO2/CH4 selectivity than conventional physical absorbents such as Selexol and Rectisol. |
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ISSN: | 0021-9568 1520-5134 |
DOI: | 10.1021/acs.jced.1c00928 |