Abstract
The P-V-T-X relations around the phase boundaries have been measured for the carbon dioxide-nitrogen and the carbon dioxide-methane systems. A visual glass capillary was used as the equilibrium cell. The principle of the experimental procedure is based on the dew and bubble point method. The pressure range covered was from 20 to 150 atm and the experimental temperatures were 15°C, 0°C and -20°C. From the data obtained, compressibility factor charts were constructed for the entire experimental range. The fugacities and partial molar volumes were also calculated.
Finally it was found that there is a straight-line relationship between pressure and average density of coexisting liquid and vapor for the binary systems studied here. This relationship is similar to Cailletet-Mathias rule between temperature and average density for a pure substance.
