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length in cation. The investigation of CO2 absorption enthalpy in this work shows that the magnitude of CO2 absorption enthalpy decreases with increasing chain length in cation. The CO2 absorption enthalpy in [bmim][BF4], [hmim][BF4] and [omim][BF4] at 298 K was illustrated in Fig. 6 as an example. The corresponding CO2 loading is also depicted in order to check the capacity (loading) and the corresponding enthalpy simultaneously. As shown in Fig. 6, with increasing chain length in cation, the CO2 loading in ILs increases with the chain length in cation (Fig. 6a), while the magnitude of CO2 absorption enthalpy decreases (Fig. 6b). The same tendency is also observed for [PF6]- and [Tf2N]-series of ILs throughout the whole studied temperature range and for [BF4]-series of ILs at other temperatures. 3.2.2. Influence of anion The anion is a more important factor to affect the CO2 solubility in ILs compared to the chain length in cation [30,32]. The effect of anion on the CO2 absorption enthalpy in different imidazolium- based ILs was investigated in this work. Figs. 7 and 8 illustrate the CO2 loading and CO2 absorption enthalpies in [emim]-based Y. Xie et al. / Applied Energy 136 (2014) 325–335 329 Fig. 2. CO2 solubility in [emim][BF4]. Symbols: experimental data. s Soriano [26], h Kim [25], 4 Lei [27], r Huang [28]. Curve: correlations with NRTL-RK. Fig. 3. CO2 solubility in [bmim][PF6]. Symbols: experimental data. j Blanchard [39], d Aki [30], N Kumełan [47], . zhang [46], h Liu [43], s Kamps [44], 4 Shariati [45], r Kim JE [48]. Curve: correlations with NRTL-RK model. Fig. 4. CO2 solubility in [bmim][Tf2N]. Symbols: experimental data. j Aki [30], . shin [52], h Raeissi [56], s Carvalho [53], 4 Oh [55], r Jacquemin [50], I Safarov [58]. Curve: correlations with NRTL-RK model.PDF Image | CO2 Separation with Ionic Liquids
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