Phase Behaviors of Aerosol-OT Analogue Fluorinated Surfactants in 1,1,1,2-Tetrafluoroethane and Supercritical CO2

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• 作者：Zhao-Tie Liu ; Ling Liu ; Jin Wu ; Jian Lu ; Ping Sun ; Liping Song ; Zhongwen Liu ; Wensheng Dong ; Ziwei Gao
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2007
• 出版时间：January 3, 2007
• 年：2007
• 卷：46
• 期：1
• 页码：22 - 28
• 全文大小：143K
• 年卷期：v.46,no.1(January 3, 2007)
• ISSN：1520-5045

文摘

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), weresynthesized and characterized by ¹H NMR, ¹³C NMR, ¹⁹F NMR, melting point, and elemental analysis. Thepressure-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 behaviorsfor 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-pointpressures increased with the increase of water-to-surfactant ratio (W_o) and the concentration of the surfactants.The cloud-point pressures for the surfactants in HFC-134a decrease with an increase in temperature at afixed W_o and a surfactant concentration, which is in opposition to the results obtained in scCO₂.