Volumetric Properties of Carbon Dioxide + Ethanol at High Pressures

Abstract

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.

Efficient encapsulation of proteins in submicro liposomes using a supercritical fluid assisted continuous process

“…The effect of pressure on liposome mean size can be explained considering that, increasing the pressure, an increase of CO 2 density and, consequently, of expanded liquid mixture density is obtained [38,39], that favors atomization of the water injected in the high pressure vessel [40]. The generation of smaller water droplets, could lead to the formation liposomes with smaller diameter.…”

Extraction of Phospholipids from Salmon Roe with Supercritical Carbon Dioxide and an Entrainer

“…The logical choice for a co-solvent in the food industry would be ethanol. The authors used ethanol as the entrainer to extract PLs in SC-CO 2 because: (i) It is suitable for food use; and (ii) the phase behavior of CO 2 /ethanol mixes at high pressure is available (26,27). CO 2 and ethanol were mixed and passed through the preheating coil, and delivered to the vessel in the oven to extract the lipids.…”

Fractionation technologies for liquid mixtures using dense carbon dioxide

“…Experimental data on the volumetric behaviour of essential oil constituents and aqueous systems with CO 2 or other gases were not found in the literature. Few studies reporting experimental data of binary mixtures of alcohols or acetone with CO 2 are reported in the literature [231][232][233][234]. Indeed, most studies reporting experimental values of the volumetric behaviour of mixtures with CO 2 or other gases at high pressures relate to hydrocarbons [235][236][237][238][239][240][241][242].…”