The solubility and diffusivity of CO2 in 12 different 1,3-difunctionalized imidazolium bistriflamide ionic liquids (ILs) were determined using gas uptake measurements. The density, viscosity, conductivity and self diffusivity of the ILs were also measured. The ionicity of the ILs were quantified in terms of the Haven ratio, calculated using the self-diffusion coefficient and conductivity. The Henry's Law constant for CO2 in the ILs showed a strong correlation to the square of the difference in the solubility parameters of the ILs and CO2, consistent with regular solution theory. A stronger correlation was observed when both the IL solubility parameter and the Haven ratio were included in the correlation. CO2 diffusivities in the ILs were found to be linearly related to the self-diffusion coefficient of the IL cations. Interestingly, structural isomers of ILs were found to have the same CO2 solubility (when expressed as CO2 mole fraction), but distinct CO2 diffusivities. The product of solubility and diffusivity (i.e., permeability) was found to correlate well with IL viscosity alone, despite the fact that solubility and diffusivity were each found to depend upon both IL viscosity and molar volume.

Characterization of novel difunctionalized imidazolium bistriflamide ionic liquids for CO<sub>2 </sub>capture

248th National Meeting (2014)

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Characterization of novel difunctionalized imidazolium bistriflamide ionic liquids for CO2 capture

Characterization of novel difunctionalized imidazolium bistriflamide ionic liquids for CO₂capture