The volumetric properties of carbon dioxide + ethanol mixtures have been determined at 323, 348, 373, 398, and 423 K at pressures up to 70 MPa using a variable-volume view cell. Densities for pure components and mixtures containing 90, 80, 70, and 50% by mass carbon dioxide are reported as a function of pressure at each temperature. It is shown that this system undergoes a density crossover at high pressures with each composition, a phenomenon previously reported also for mixtures of carbon 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.
Volumetric behavior of carbon dioxide + toluene has been investigated at (323, 348, 373, 398, and 423) K at pressures up to 70 MPa. Densities for pure components and mixtures containing (58, 68, 80, and 88) mass % carbon dioxide are determined as a function of pressure at each temperature. It is shown that with increasing pressure the density of carbon dioxide becomes greater than that of toluene. Mixture densities also show a density crossover at different pressures depending upon the composition. In the composition range evaluated, the excess volume of the mixtures is observed to be mostly negative. It becomes more negative with increasing temperature, but less negative with increasing pressure.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.