醇和油水比对馏分油微乳液体系的影响

Effect of cosurfactant and oil/water volume ratio on the phase behavior of microemulsion

摘要:

以异构十三烷基聚氧乙烯醚-5（E1305）为表面活性剂，分别以柴油和350~395℃、395~450℃、450~500℃馏分油为油相，考察了正丁醇含量和油水比对不同油相的微乳液相行为的影响。结果表明，随正丁醇含量增加，微乳液体系相态由Winsor Ⅰ→Winsor Ⅲ→Winsor Ⅱ型转变。油相馏程温度升高，体系的最佳增溶参数(SP*)降低而最佳醇度(A*)升高。对于正丁醇及E1305含量较低体系，随油水比增大，相态发生由胶团溶液类→类Winsor Ⅱ→Winsor Ⅳ→Winsor Ⅰ型转变。对于正丁醇含量较低且E1305含量较高体系，随油水比增大，相态由胶团溶液直接转变为Winsor Ⅰ型微乳液。对于正丁醇含量较高体系，随油水比增大，相态均由Winsor Ⅱ→Winsor Ⅲ→Winsor Ⅰ转变，发生相转变所需的油水比与表面活性剂含量和油相的馏程温度相关。

Abstract:

The effects of n-butanol content and oil-water ratio on the microemulsion phase behavior of diesel oil and distillate oil at 350~395℃, 395~450℃ and 450~500℃ were investigated using isoctyl polyoxyethylene ether-5 (E1305) as surfactants. The results showed that the phase of microemulsion system changed from Winsor I →Winsor III →Winsor II with the increase of n-butanol content.The optimum solubilizing parameter (SP*) decreases while the optimum alcoholicity (A*) increases with the increase of oil phase distillation temperature. For the system with low contents of N-butanol and E1305, the phase changes from micelle solution type → Winsor-like II → Winsor IV→Winsor I with the increase of oil-water ratio. For the system with lower n-butanol content and higher E1305 content, the phase changes directly from micelle solution to Winsor I microemulsion with the increase of oil-water ratio. For the system with higher n-butanol content, the phase states change from Winsor II →Winsor III →Winsor I with the increase of oil-water ratio. The oil-water ratio required for phase transformation is related to the surfactant content and the distillation temperature of the oil phase.