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In this work, the solubilities and diffusion coefficients of refrigerant trans-1-chloro-3,3,3-trifluoropropene (R1233zd­(E)) in three imidazolium ionic liquids were measured at temperatures from 303.1 to 343.2 K and pressures up to 0.14 MPa. The ionic liquids include 1-hexyl-3-methyl-imidazolium bis­(trifluoromethylsulfonyl)­amide ([HMIM]­[Tf2N]), 1-hexyl-3-methylimidazolium trifluoromethanesulfonate ([HMIM]­[TfO]), and 1-hexyl-3-methyl-imidazolium tetrafluoroborate­([HMIM]­[BF4]). The non-random two-liquid (NRTL) activity coefficient model was employed to correlate the experimental solubility data successfully, the AAD between the measured data and calculated values for the solubilities of R1233zd­(E) in [HMIM]­[Tf2N], [HMIM]­[TfO], and [HMIM]­[BF4] are 3.1, 2.5, and 4.0%, respectively. The Wilke–Chang equation was used to correlate diffusion coefficients, the relative deviations between experimental results and the values calculated are most within 10%. Meanwhile, the solubility and diffusivity of refrigerant gases R32, R125, R152a, R161, R143a, R1234yf, R1234ze­(E), and R1233zd­(E) in ionic liquids [HMIM]­[Tf2N], [HMIM]­[TfO], and [HMIM]­[BF4] were compared and analyzed.

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