Solubility and Diffusivity of CO2 in the Ionic Liquid 1-Butyl-3-methylimidazolium Tricyanomethanide within a Large Pressure Range (0.01 MPa to 10 MPa)

Ionic liquids (ILs) are promising solvents for carbon capture because of their high sorption capacity and low regeneration energy compared to conventional amine-based solvents. Previously, tetracyanoborate-based ILs have shown enhanced carbon dioxide (CO2) absorption capacity and absorption kinetics due to their low viscosity.1 In this work, the related IL 1-butyl-3-methylimidazolium tricyanomethanide ([bmim][tcm]) is studied for the first time as a solvent for CO2 capture. The physicochemical properties (e.g., density, viscosity, electrical conductivity, surface tension, thermal decomposition temperature, glass transition point) of pure [bmim][tcm] were experimentally determined and successfully described using appropriate correlations. [Bmim][tcm] was found to be a low-viscous IL with a relatively high thermal stability (Tdecomp = 473.15 K). The solubilities of CO2 in [bmim][tcm] were measured at temperatures ranging from (288.15 to 363.15) K and a pressure range of (0.01 to 10) MPa using two different ...

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