Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

The phase behavior and critical parameters of CO2 (1) + pentane (2) and CO2 (1) + acetone (2) were determined experimentally, and their densities were measured in both the subcritical and supercritical regions. The isothermal compressibility (KT) was calculated using the density data. It is demonstrated that the density is sensitive to pressure as the pressure approaches the critical point of the mixtures, that is, KT is large and increases sharply. KT also increases significantly as the pressure approaches the dew point or the bubble point at other compositions close to the critical composition. However, KT is very small and is not sensitive to pressure well above the dew point or the bubble point. When the composition is far from the critical one, KT is fairly small and the effect of pressure on KT is very limited, even near the phase separation point.