SOLUBILIZATION IN NONIONIC REVERSE MICELLES IN CARBON-DIOXIDE

Phase behavior data and FTIR spectra along with solubilities and solva tochromic shifts of ionic indicator dyes are reported for binary, tern ary and quaternary systems composed of pentaethylene glycol n-octyl et her (C8E5), CO2, water, and n-pentanol as a function of temperature, p ressure and composition. With the addition of n-pentanol as a cosurfac tant, the water to surfactant ratio, W(o), reaches values as high as 1 2. As water is added further, a surfactant-rich phase precipitates due to micelle-micelle interactions. Ionic dyes are soluble at levels of 0.03 mM, far in excess of the negligible solubility in pure CO2.