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

ABSTRACT

The density of ethanol saturated and expanded with carbon dioxide (CO2) was determined at (313.2, 328.2, and 343.2) K and up to pressures close to the mixture critical point using a novel device, consisting of a high-pressure view cell equipped with a sinker attached to a spring balance and a microscopic optical measuring device. The density of CO2-expanded ethanol increased with pressure up to a maximum value at each temperature studied. A further increase in pressure caused a pronounced decrease in density until the mixture critical point was reached. The increase in density was temperature-dependent, with a less pronounced increase at higher temperatures. In the temperature and pressure range studied, the maximum increase in density of CO2-expanded ethanol was (6.3, 4.8, and 3.7) % at (313.2, 328.2, and 343.2) K, respectively. At all temperatures investigated the density of CO2-expanded ethanol exhibited the maximum value at pressures corresponding to a CO2 density of about 190 kg*m-3, which translates into a reduced CO2 density of 0.4. The experimental density data for CO2-expanded ethanol were correlated to pressure and temperature; furthermore, a new correlation for CO2-expanded ethanol density based on the reduced density of CO2 and temperature was developed.