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inconsistent data from the references [93, 96, 121, 123] was excluded in the further investigation. Table 4.4. Sources of experimental property of three imidazolium-based ILs. Property [hmim][Tf2N] [bmim][Tf2N] [bmim][PF6] Density [83-90] [100-105] [103, 106, 110-118] Viscosity [87-94] [89, 104, 106] [94, 106, 111, 116, 119, 120] Ref. Surface tension [83, 88, 95-97] [95, 97, 105, 107, 108] [96, 107, 115, 121, 122] Heat capacity [93, 98, 99] [103, 109] [123-127] After the evaluation, the consistent data from different sources was fitted to the empirical equations (3.7-3.10) in order to conduct process simulation. The comparison of the fitted results with the experimental data is illustrated in Figure 4.5. The effects of alkyl chain length of cation and anion on the property of these three ILs were further investigated. For [Tf2N]-based ILs, the density and surface tension decrease while the viscosity and heat capacity increase when the alkyl chain length of cation increases from [bmim] to [hmim]. This observation reveals that with increasing alkyl chain length of cation, the mass per unit volume (density) and the energy per unit area (surface tension) decrease, while the resistance to shear stress (surface tension) and heat capacity increase. For the ILs with the same cation but different anions (e.g. [bmim][Tf2N] and [bmim][PF6]), the viscosity and surface tension of [bmim][PF6] are much higher while the density and heat capacity are lower than [bmim][Tf2N] at one temperature. Compared to the effect of alkyl chain length of cation, the influence of anion is more pronounced, and the properties of ILs depend much on the specific anion. 27PDF Image | CO2 Separation with Ionic Liquids
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