超临界二氧化碳微乳液增溶多元醇特性

用2.5%、5.0%和7.5% (w)的1,3-丙二醇(1,3-PDO)稀水溶液为模型物质, 以超临界二氧化碳为连续相, 以琥珀酸二酯磺酸钠(AOT)为表面活性剂, 乙醇为助剂, 在压力为6.9-10.3 MPa的范围内, 温度为30-50 °C时, 分别对三种AOT浓度下的四元体系AOT/CO₂/乙醇/水和五元体系AOT/CO₂/乙醇/1,3-PDO/水的热力学行为进行了实验研究. 实验结果证明: 通过合理调控系统的操作条件, 可以形成热力学稳定的超临界二氧化碳微乳液, 并能实现选择性增溶1,3-丙二醇. 该结果可为指导工业生产提供依据.

Solubilization of Polyalcohol in Supercritical CO2 Microemuision

We mainly investigated the phase behavior of the AOT (sodium bis-(2-ethylhexyl) sulfosuccinate/CO2/ethanol/water quaternary system and the AOT/CO2/ethanol/1,3-propanediol (1,3-PDO)/water quinary system at 30-50 °C and at pressures of 6.9-10.3 MPa. AOT was used as the surfactant and ethanol was used as the cosolvent at 1,3-PDO concentrations of 2.5%, 5.0%, and 7.5%(w). This result shows that a thermodynamically stable microemulsion can be formed by controlling the operating pressures and temperatures. Subsequently, the selective extraction of 1,3-PDO from the aqueous solution can be controlled using appropriate temperatures and pressures, which is useful for the practical application of this technique in industry.