Solubilities and diffusivities of R227ea, R236fa and R245fa in 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide

Abstract The solubilities and diffusion coefficients of 1,1,1,3,3-pentafluoropropane (R245fa), 1,1,1,2,3,3,3-heptafluoropropane (R227ea) and 1,1,1,3,3,3-hexafluoropropane (R236fa) in 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([HMIM][Tf 2 N]) were determined experimentally along five isotherms (303.15, 313.15, 323.15, 333.15 and 343.15 K) with pressures from 0.01 to 0.50 MPa. The solubility measurements were carried out using the isochoric saturation method. A semi-infinite volume method was used to calculate diffusion coefficient via the time-dependent pressure-decay data. NRTL model was used to correlate the gas solubility data of R245fa, R227ea and R236fa in [HMIM][Tf 2 N] with the average absolute relative deviations less than 1.0%, while Wilke-Chang equation was used to correlate the diffusion coefficient data with the average absolute relative deviations less than 9.7%.