Binary vapor–liquid equilibrium p– T– x data were measured for R22 + DMF ( N, N-dimethylformamide) system at temperature from 283.15 to 363.15 K by the circulating method. The experimental data are correlated by the Peng–Robinson–Stryjek–Vera equation of state using the Wong–Sandler mixing rule with NRTL model. The overall deviation of the pressure is 0.57%. The results reveal that the correlated data have a good agreement with the experimental ones. It is shown that the mixture has a large negative deviation from Raoult's law. The vapor–liquid equilibrium characteristics of the mixture are expressed in a log p − 1/ T diagram and pressure–composition diagram for use in the analysis of an absorption refrigeration system.
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