DENSITY-MEASUREMENTS OF BINARY SUPERCRITICAL-FLUID ETHANE COSOLVENT MIXTURES/

Densities of binary supercritical mixtures of ethane with cosolvents, ethanol, 2,2,2-trifluoroethanol, and 1,1,1,3,3,3-hexafluoro-2-propanol , have been measured by a constant volume apparatus. Measurements were made in the range 0.7 to 2.0 mol % cosolvent and at pressures from 49 .8 to 105.7 bar at 308.2 K. Despite the low cosolvent composition, all mixture densities deviate significantly from the density of pure etha ne in the highly compressible region. Mixture densities calculated by the PR-EOS give only a qualitative representation of the experimental data.