PρTx measurements for HFC-134a plus triethylene glycol dimethylether system

Experimental densities in the compressed liquid phase are reported for 1,1,1,2-tetrafluoroethane (HFC-134a), triethylene glycol dimethylether (TriEGDME) and six of their mixtures from 293.15 to 373.15 K and at pressures up to 60 MPa. From the experimental results. we have analysed the volumetric behaviour of HFC-134a+TriEGDME. In almost all the measurement range, the density of the refrigerant is greater than that of the polyether. Furthermore, above 333.15 K the densities of the mixtures display a crossover phenomenon with composition. The excess volumes are strongly negative and asymmetrical towards high refrigerant concentrations, becoming more negative when the temperature increases and the pressure decreases. (C) 2002 Elsevier Science B.V. All rights reserved.