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The experimental data was measured at temperatures up to 450 K1 and at pressures up to several hundred bar. Several groups of data are focused on the measurements at pressures lower than 20 bar. The data, all from different sources, shows large discrepancies. For example, the CO2 solubility in [C2mim][BF4] was measured in four research groups, and the discrepancies in mole fraction of CO2 can reach 0.1. Another example was for [C4mim][PF6], at pressures higher than 20 bar, for which six groups of experimental data were available. Five of these groups were measured at pressures lower than 150 bar, and only one of them was measured at pressures higher than 150 bar with limited data points. The solubility of other gases, such as H2, N2, CO, O2, and CH4, in ILs has been measured with limited sources. Most of experimental data at elevated pressures was collected in Maurer’s group (NIST, 2006).The solubilities of H2, O2, CO in [C4mim][PF6], and that of CH4, CO, H2, and O2 in [C6mim][Tf2N] were measured at temperatures from 293 K to 413 K and at pressures up to 100 bar. In Peters’ research group, the solubilities of CH4 in [C4mim][Tf2N] and of H2 in [C6mim][Tf2N] were measured at temperatures from 300 to 450 K and pressures up to 160 bar (Ji et al., 2012, 2013a). In the research of Brennecke’s group, the solubilities of CH4 and O2 in [C4mim][PF6] and H2 in [C4mim][Tf2N] were measured at temperatures from 283 K to 323 K and pressures up to 14 bar. At pressures close to atmospheric, Gomes’s group measured the solubilities of CH4, O2, N2, CO in [C4mim][BF4], [C4mim][PF6] and the solubility of H2 in [C2mim][Tf2N] and [C6mim][Tf2N] at temperatures from 283 K to 343 K. Noble’s group determined the solubilities of CH4, H2, N2 in [C2mim][Tf2N], [C2mim][BF4] and [C6mim][Tf2N] in the range of 293 K to 343 K (Ji et al., 2012, 2013a). The solubility of hydrogen sulfide H2S in ILs has been measured extensively in literature, and the effect of temperature, pressure, cation, anion as well as alkyl length on H2S solubility in IL has been studied. Compared to the solubility of other gases in ILs, the experimental H2S solubility data has been measured only at pressures up to 20 bar. The high H2S solubility in ILs and the corrosiveness of highly concentrated H2S mixtures might be the reasons for this limitation. The detail of the available experimental data for H2S in ILs has been described in the publication (Ji et al., 2013a). 1 Temperature expressed in Kelvin (K). The temperature in degrees Celsius (°C) can be expressed as follows: (T[°C] = T[K] − 273,15. Thus 450 K is the same as 450-273,15 = 176,85 °C. 69PDF Image | BIOMASS TO ENERGY AND CHEMICALS HighBio2 Project Publication
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