Liquid Densities and Vapor Pressures of 1,1,2,2-Tetrafluoroethane (HFC 134) and 1,1-Dichloro-1-fluoroethane (HCFC 141b)

Saturated liquid densities and vapor pressures of HFC 134 and HCFC 141b were measured at temperatures from 200 to 400 K by a magnetic densimeter coupled with a variable volume cell. For HFC 134, 38 saturated liquid densities associated with the vapor pressures and 5 compressed liquid PVT properties at temperatures 280-400 K and pressures up to 2 MPa were measured. For HCFC 141b, 37 saturated liquid densities associated with the vapor pressures and 24 compressed liquid PVT properties were measured at the same ranges. The experimental uncertainties In temperature, pressure, and density measurements were estimated to be not greater than ±15 mK, ±10 kPa, and ±0.2%, respectively. The purities of the sample used were 99.4 and 99.8 wt % for HFC 134 and 98.8 wt % for HCFC 141b. The simple correlations for saturated liquid densities and vapor pressures were developed for both substances on the basis of the present measurements. Compressed liquid PVT properties were compared with the Kumagal’s Talt-equatlon.