The effect of adding organic solvents on the phase behavior in water/surfactant/scCO2 microemulsion in supercritical state

초록

Water/CO2 (W/C) microemulsion was fanned by sodium salt of bis(2,2,3,3,4,4,5,5-octafluoro-l-pentyl)-2-sulfosuceinate and the phase behavior of this emulsion was investigated in supercritical state. In addition, the change of the phase behavior of W/C microemulsion was observed when various organic solvents were added into this microemulsion. The added organic solvents are isopropanol, n-propanol, ethanol, methanol, pyridine, 2-methoxyethanol, tetrahydrofuran, acetonitrile, acetone, and 1,4-dioxane. According to the results, the phase behavior of W/C microemulsion depended on the temperature and pressure and the microemulsion was thermodynamically stable in the special range of pressure. In case of W/C microemulsion with organic solvents, the phase behavior of this system was affected by the solubility parameter of organic solvents.

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