Vapor pressure and P-V-T measurements for 1,1,1,2,3,3-hexafluoropropame (R-236ea)

A constant-volume cell was used to measure saturated vapor pressure and P-V -T properties for 1,1,2,3,3,3-hexafluoropropane (R-236ea). A temperature ra nge from 255 K to 363 K and a corresponding pressure range from 35 kPa to 1 269 kPa were covered in the saturated pressure region. The results were fit ted to the modified Riedel equation. The P-V-T measurements in the superhea ted vapor region were taken along four isochores from 313 K up to 367 K and from 275 kPa up to 914 kPa. For the gas-phase region, the second virial co efficients were calculated using the Tsonopoulos and Weber correlating meth ods. Using the Orbey and Vera, and the Weber correlating methods, the contr ibution of the third virial coefficients was also considered. In the result s of our measurements, 80 data points were collected, 43 and 37 of which we re obtained, respectively, for the saturated pressure and superheated regio ns. The P-V-T measurements were compared with the few data available in the literature by means of a virial equation of state, revealing a good consis tency.