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International audienceThe present study concerns p-T-x phase equilibria measurements involving two working fluid pairs (Refrigerant + Organic solvent) , namely 1,1,1,2-tetrafluoroethane (R134a) + N,N – dimethylacetamide (DMA) and , 1,1,1,2-tetrafluoroethane + N-methyl-2-pyrrolidone (NMP), using the static-analytic method at temperatures varying between 303 and 353 K. The experimentally measured data were successfully correlated using the Peng – Robinson equation of state (PR-EoS) in combination with Huron-Vidal mixing rule, and the non-random two liquid activity coefficient model (NRTL), contrarily to the predictive Soave-Redlich-Kwong (PSRK) group contribution equation of state which failed to reproduce accurately enough such data

p–T–x Measurements for 1,1,1,2-Tetrafluoroethane (R134a) + N,N-Dimethylacetamide (DMA) and N-Methyl-2-pyrrolidone (NMP)