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Phase Behaviors of Aerosol-OT Analogue Fluorinated Surfactants in 1,1,1,2-Tetrafluoroethane and Supercritical CO2.
- Source :
-
Industrial & Engineering Chemistry Research . Jan2007, Vol. 46 Issue 1, p22-28. 7p. - Publication Year :
- 2007
-
Abstract
- A series of Aerosol-OT (AOT, sodium bis(2-ethylhexyl)sulfosuccinate) analogue fluorinated surfactants, i.e., the sodium salt of bis(2,2,3,3,3-pentafluoropropyl) 2-sulfosuccinate (di-CF2), the sodium salt of bis(2,2,3,4,4,4-hexafluorobutyl)2-sulfosuccinate (di-HCF3), the sodium salt of bis(3,3,4,4,5,5,6,6,6-nonafluorohexyl)2-sulfosuccinate (di-HCF4), and the sodium salt of bis(2,2,3,3-tetrafluoropropyl) 2-sulfosuccinate (di-HCF2), were synthesized and characterized by 1H NMR, 13C NMR, 19F NMR, melting point, and elemental analysis. The pressure-temperature (P-T) phase diagrams for water-in-CO2(W/CO2) and water-in-1,1,1,2-tetrafluoroethane (W/HFC-134a) microemulsions stabilized by the surfactants were determined. In this work, the phase behaviors for different surfactants are obtained in supercritical CO2(scCO2) and 1,1,1,2-tetrafluoroethane (HFC-134a) as a function of temperature, pressure, and water-to-surfactant ratio. At a fixed temperature, the cloud-point pressures increased with the increase of water-to-surfactant ratio (Wo) and the concentration of the surfactants. The cloud-point pressures for the surfactants in HFC-134a decrease with an increase in temperature at a fixed Woand a surfactant concentration, which is in opposition to the results obtained in scCO2. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SURFACE active agents
*SODIUM salts
*DETERGENTS
*TEMPERATURE
Subjects
Details
- Language :
- English
- ISSN :
- 08885885
- Volume :
- 46
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Industrial & Engineering Chemistry Research
- Publication Type :
- Academic Journal
- Accession number :
- 23618801
- Full Text :
- https://doi.org/10.1021/ie061117k