石油醚W/O乳状液及其液膜稳定性

以破乳率为衡量标准,借助显微镜直接观察,探讨了乳状液含水量、表面活性剂用量、乳化时间、乳化强度等因素对石油醚W/O型乳状液体系稳定性的影响。在实验范围内,乳状液含水量的提高及表面活性剂用量的增加,有利于乳状液的稳定;存在较优的乳化时间20min和乳化强度4000rmin-1。选取脂肪烃、芳香烃、混合烃共6种不同油相制备乳状液,对比其稳定性的差异。此外,还初步考察了石油醚W/O/W液膜溶胀和泄漏问题,结果表明该乳状液膜泄漏率低于3.5%,表观溶胀率约为20%。

Stability of Water-in-oil Emulsion and its Liquid Membrane

The effects of water content, surfactant concentration, emulsifying time and velocity on stability of water-in-oil petroleum ether emulsions were studied with demulsification ratio as the standard, while the microscope was used to observe samples of the emulsion directly. In the experiment range, the increases of water content and surfactant concentration are beneficial to the stability of emulsion, and the optimal emulsifying time is 20min and emulsifying velocity is 4000 rmin-1. The stabilities of water in oil emulsions formed by six different kinds of solvent as oil phases, such as n-hexane, cyclohexane, toluene, o-xylene, petroleum ether and kerosene were studied and compared. Moreover, on the basis of optimal emulsion factors, leakage and swelling of the water-oil-water liquid membrane was studied. The results show that leakage is small, less than 3.5 percent, but entrainment swelling is serious, about 20 percent.