Experimental Measurement of Vapor Pressures and Densities of Pure Hexafluoropropylene

Abstract

Hydrofluoroalkenes, like hexafluoropropylene, can be considered as new fluids for refrigeration systems, and consequently volumetric and critical property data are required. In this study a vibrating-tube densitometer technique was used to determine densities at 10 different temperatures between (263 and 362) K and pressures between (0.0009 and 10) MPa. The experimental uncertainties are ± 0.0005 MPa for pressure, ± 0.02 K for the temperature, and ± 0.05 % for vapor and liquid densities. Critical properties have been determined by direct measurement and utilization of experimental densities considering scaling laws. The Wagner, Span and Wagner, Peng−Robinson, and translated Peng−Robinson equations of state are used to correlate the data.