Thermodynamic properties of 1,1-difluoroethane in the super-critical and high-density regions

A. Iso and M. Uematsu

Physica A: Statistical Mechanics and its Applications, 1989, vol. 156, issue 1, 454-466

Abstract: The volumetric properties of 99.9% pure 1,1-difluoroethane were measured in the range of temperatures from 320 to 400 K by a variable volume method using a metal bellows. The unsmoothed 221 PVT measurements along 14 isotherms, which cover the region of densities between 232 and 883 kg/m3 up to a maximum pressure of 10.0 MPa, are reported. The uncertainties in the temperature, pressure, and density measurements were estimated to be 6 mK, 2.1kPa, and 0.3%, respectively. Based in these results, the derivatives were calculated and the behavior of the isothermal compressibility and volume expansion coefficient in the high-density region is shown as a function of temperature and pressure. Thevapor pressures were also measured at seven different temperatures of 320, 350, 353.16, 360, 380, 384.95, and 385 K, and the results are compared with the data in the literature. Saturated vapor and liquid densities were measured to confirm the reliability of the present results.

Date: 1989
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:156:y:1989:i:1:p:454-466

DOI: 10.1016/0378-4371(89)90134-9

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