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-Sandier 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 logp -1/T diagram and pressure-composition diagram for use in the analysis of an absorption refrigeration system. (C) 2008 Elsevier B.V. All rights reserved.