Vapor-liquid equilibrium and diffusion coefficients of R32 + [HMIM][FEP], R152a + [HMIM][FEP] and R161 + [HMIM][FEP]

In this paper, new data for the solubilities and diffusion coefficients of difluoromethane (R32), fluoroethane (R161) and 1,1-difluoroethane (R152a) in ionic liquid 1-hexyl-3-methylimidazolium tris(pentafluoroethyl)trifluorophosphate ([HMIM][FEP]) at temperatures ranging from 293 K to 343 K and at pressures up to 0.5 MPa were presented. The solubilities of R32, R161 and R152a in [HMIM][FEP] can be improved by decreasing the temperature and increasing the pressure. With the increasing temperature, the diffusion coefficients and Henry's law constants of the three hydrofluorocarbons increase. The solubilities and diffusion coefficients of R32, R152a, and R161 in [HMIM][FEP] were correlated well with the NRTL equation and the Wilke-Chang equation, respectively.