The isothermal vapor−liquid equilibrium (VLE) data of fluoroethane (R161) + N,N-dimethylacetamide (DMAC), R161 + Nmethyl-2-pyrrolidone (NMP), and 1,1,1,2-tetrafluoroethane (R134a) + DMAC were measured in a temperature range from (293.15 to 353.15) K, and the five-parameter nonrandom two-liquid (NRTL) model was selected to correlate the obtained VLE data. According to the order of R161 + DMAC, R161 + NMP, and R134a + DMAC, the mean relative deviations of the pressure between the experimental and calculated values are 1.16 %, 1.39 %, and 1.13 %, and the maximum deviations of that are 3.30 %, 3.59 %, and 3.14 %. The experimental results show that all of the binary systems have very good affinity, and especially the affinity of the system R161 + DMAC is the best. Additionally, the three binary systems exhibit negative deviations from Raoult's law, and the order of the negative deviation degree from strong to weak is arranged as R161 + DMAC > R161 + NMP > R134a + DMAC.

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