Add time:09/26/2019 Source:sciencedirect.com
The vapor-liquid equilibrium (VLE) of toluene-ionic liquid (IL) from short- to long-chain imidazolium-based ILs (i.e., [C4MIM]+, [C8MIM]+, [C10MIM]+, and [C12MIM]+) with various anions (i.e., [BF4]−, [PF6]−, and [Tf2N]−) was first measured under wide concentration and temperature ranges. These thermodynamic data are of great significance for an in-depth understanding with respect to capturing condensable gases with ILs. The UNIFAC-Lei model was applied to describe the VLE and successfully extended from short- to long-chain imidazolium-based ILs. For the ILs with relatively short alkyl side-chains on cations (e.g., [C4MIM]+ and [C8MIM]+), the vapor pressure depends on the types of both anions and cations, while for the ILs with long alkyl side chains on cations (e.g., [C10MIM]+ and [C12MIM]+), the vapor pressure is mainly dependent on the type of cations. Moreover, the COSMO-RS model and quantum chemistry calculations were used together to provide microscopic insights into the effect of IL structures on the VLE of toluene-IL systems.
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