Solubility of carbon dioxide and ethane in three ionic liquids based on the bis{(trifluoromethyl)sulfonyl}imide anion

Densities and refractive indices of imidazolium- and phosphonium-based ionic liquids: Effect of temperature, alkyl chain length, and anion

“…Nevertheless, the values for the calculated molar refractions of all the studied ionic liquids were calculated and are listed in table TABLE 4 Values of calculated molar volumes and molar refractions of ionic liquids at four selected temperatures between 293 K and 333 K. It is tempting, from the analysis of these so called molar free volumes, to relate them with the solubility of different species in the ionic liquids, especially low molecular weight solutes that are gaseous at normal conditions. At first glance, the solubility of CO 2 [55][56][57][58][59][60][61] and of non-polar gases like C 2 H 6 [47,60,61] in different ionic liquids measured by several research groups, correlate well with the free volumes per mole calculated as explained in the paragraph above. For example, the solubility of both gases increases with the alkyl side-chain of the cation in [C n mim][NTf 2 ] ionic liquids and, furthermore, the effect of the anion on the solubility of CO 2 [57,58,[62][63][64] or on the solubility of non-polar gases like CH 4 or C 2 H 6 follows the same trend as the calculated free volumes [63,64].…”

Gaseous Hydrocarbon Separations Using Functionalized Ionic Liquids

“…In this work, we have studied the possibility of using ionic liquids for the separation of light saturated and unsaturated hydrocarbons and have started by compiling the literature results on the solubility of ethane and ethylene in different ionic liquids formed by the cations and anions in Table 1. The Henry's law constants for ethane and ethylene are reported in Figure 2 [2,[8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] and Table 2 ). The authors observed that small changes in the structure of the ionic liquid can have large effects in the ethane and ethylene solubility as illustrated in Figure 2 and can significantly influence the ideal selectivity of ethylene as shown in Figure 3 [9-26, 28, 29].…”

Imidazolium-based ionic liquids with cyano groups for the selective absorption of ethane and ethylene

“…In this method a known amount of gas is put in contact with a precisely determined quantity of degased ionic liquid. The pressure at thermodynamic equilibrium allows the determination of the amount of gas absorbed by the ionic liquid [19][20][21]. The gas solubility is typically measured at five temperatures between 303.15 K and 343.15 K. To ensure the accuracy of the results, generally several independent measurements are performed for the same system.…”