Vapor pressure measurements and predictions for the binary and ternary systems containing ionic liquid [EMIM][Tf2N]

The vapor pressures of water + 1-ethyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)-amide ([EMIM][Tf2N]) binary system at temperatures ranging from 323.2 to 358.2 K and mole fraction of ionic liquid (IL) ranging from 0.05 to 0.90 were measured using a modified equilibrium still. The results showed that with the addition of IL, the vapor pressure of binary system is lower. The predictive thermodynamic models, i.e., UNIFAC-Lei and COSMO-RS models were used to predict the vapor pressure with the ARDs of 3.55% and 7.69%, respectively. Then, the adsorption amount of H2O in [EMIM][Tf2N] and ZIF-7/ZIF-8 mixture were predicted by the lever rule combining the UNIFAC-Lei model with GCMC simulation. The predicted results show a satisfactory agreement with the experimental data. Moreover, the vapor pressures of water + [EMIM][Tf2N] + ZIF-7/ZIF-8 ternary systems were measured with the mass fractions of ZIF-7/ZIF-8 from 0.005 to 0.05. However, it was found that the addition of ZIFs into water and IL mixture has little effect on the vapor pressure in the concentration range investigated.