双尾表面活性剂/盐水溶液/正辛烷三元体系相态特性的研究

Study of phase behavior of ternary system consisting of double tail surfactants/brine/octane

研究了在不加助表面活性剂的情况下,双尾表面活性剂盐水溶液和正辛烷组成的三元体系中能否形成中相微乳液及其相关的相态特性。结果表明,在不加助表面活性剂的情况下,双尾表面活性剂CmGA(EO)nS(m=12,14,16;n=0,1,3,4,8)中,只有C14GA(EO)nS(n=1,3,4)可与盐水及正辛烷形成中相微乳液;以适宜的增溶参数、低界面张力值以及相体积图为基础所确定的形成中相微乳液的最佳含盐量三者一致性较好;随着C14GA(EO)nS(n=1,3,4)中EO基团数增加,形成中相微乳液的最佳盐度和增溶参数皆随之增加,而最佳界面张力值则降低。

In a ternary system consisting of double tail surfactant/brine/octane and without the addition of co - surfactant, whether middle phase microemulsion would be formed and the relevant phase behaviors of the ternary system were investigated. Results showed that among the double tail surfactants C mGA （EO）AS （m = 12,14,16 ; n = 0,1,3,4,8 ）, only C14GA（EO）nS （ n = 1 ,3,4 ） can form middle phase microemulsion together with brine and octane. There is quite good consistency among the suitable solubilization parameter, the lowered interfacial tension and the optimal salinity for forming the middle phase microemulsion that determined by using volumetric phase diagram as the basis. With the increasing of EO group in the surfactants C14GA（EO）nS （n = 1,3,4）, both the optimal salinity and optimal solubilization parameter will increase, but the optimal interfacial tension will decrease.