SDBS/正辛烷/醇/盐水体系微乳液相行为的研究

Studies on the Phase Behavior of the SDBS/ Alcohol/n-Heptane/Brine System

根据正变试验方法设计的实验得到了ＳＤＢＳ／ｎ—Ｃ４ＯＨ／ｎ—Ｃ８Ｈ１８／ｂｒｉｎｅ体系微乳液形成的最佳条件：ＣＳＤＢＳ（％）＝１．０－２．０，Ｃｎ－Ｃ４ＯＨ＝２．５—４．０和ＣＮａＣＩ（％）＝１.８－２．２，并研究了盐浓度、正丁醇浓度、表面活性剂浓度和醇种类对体系相态、最佳含盐度（Ｓ＊）和盐宽度（Ｓ）的影响。得到了随着体系含盐度ＳＤＢＳ浓度和醇浓度的增加，体系均经历从下相微乳液和剩余（油相）的两相平衡，到中相微乳液与剩余油相、剩余水相的三相平衡，到上相微乳液与剩余水相的两相平衡相态的转变．且随着体系中醇碳链的增长，中相微乳液的盐宽、最佳含盐度减小；当体系中ＳＤＢＳ浓度极低时，便可形成中相微乳液。

Based on the orthogonal design, the optimal formation conditions of the middlephase microemulsions in the sodium dodecyl benzene sulfonate (SDBS) /n --butanol/n -- heptane/brine system were obtained as follows' CsDBS(%) = 1.0 -- 2.0, Cn-butanol (%) =2.5-4.0, andCNaCl(%)= 1 .8 ~ 2.2. The effect of the concentrations of NaCl, n--butanol, SDBS, and the kindof alcohols (n-propanol, n-butanol, and n -pentanol) on the phase behavior ofmicroemulsions, the optimal salinity (S), and the length of salinity (S) were investigated.Some rules and data were obtained about the formation and characterities of the middle--phasemicroemulsions.