十六烷基磺酸钠微乳液的相图和热力学函数的研究

Phase Diagram and Thermodynamic Functions of Microemulsions

本文研究的微乳液由十六烷基磺酸钠、正辛烷、水和醇等四组分构成。首先研究在不同含油量下(10％,25％,50％,75％,90％)的相图,然后在固定含油量下(10％和50％)改变醇的种类(从正丁醇到正癸醇)观察其相图的变化,最后,从微乳液拟三组分相图出发,计算出各种醇从油相到微乳液液滴界面上的标准吉氏自由能变化。经计算机拟合可得到它们与醇的烃链长及体系中含油量的关系式。对上述结果,我们进行了理论上探讨,其结果对三次采油有一定的指导意义。

In this paper an overall picture of the diagram of the water-octane- alcohol-HS(Sodium cetylsulfonate)was studied, particularly on the effect of molecular weight of alcohol and concentration of octane. From the pseudo-3-component diagram of microemulsions consisting of the above four compon-ents, the plots of n_a/n_s versus n_o/n_s(n_a, n_s, n_o are the molar concentrtions of alcohol, HS and oclane respectively)are found to be a straight line with slope K and intercept I, Through these data we can calculate the standad free energy of Transfer from the continuous oil phase to the interfac-ial region for the cosurfactants, such as n-butnol, n-hexanol, n-octanol and n-dodecanol. Some rules have been postulated and theoretical discussions have been carried out. They are believed to be of practical importance for tertiary oil recovery.