VOLUMETRIC PROPERTIES OF CARBON-DIOXIDE PLUS ETHANOL AT HIGH-PRESSURES

The volumetric properties of carbon dioxide + ethanol mixtures have be en determined at 323, 348, 373, 398, and 423 K at pressures up to 70 M Pa using a variable-volume view cell. Densities for pure components an d mixtures containing 90, 80, 70, and 50% by mass carbon dioxide are r eported as a function of pressure at each temperature. It is shown tha t this system undergoes a density crossover at high pressures with eac h composition, a phenomenon previously reported also for mixtures of c arbon dioxide + pentane, carbon dioxide + toluene, and carbon dioxide + acetone. In the composition range investigated, the excess volume of the mixtures becomes more positive with increasing pressure but more negative with increasing temperature.