聚氧丙烯醚型表面活性剂结构及矿化度对油水界面张力的影响

Effects of the structure of polyoxypropylene ether surfactants and the salinity of water on oil-water interfacial tension

实验选用9AS-n-0、13AS-n-0系列氧丙烯聚醚型表面活性剂,使用Texa-500型界面张力仪在55℃时不同矿化度条件下,测定了表面活性剂水溶液与桩西106-x18-15脱水原油间的界面张力,研究了矿化度及表面活性剂分子结构与油水界面张力的关系.研究发现,随着矿化度的增加,界面张力不断降低,在某一特定值时,界面张力达到最小值;随着氧丙烯链的增长,达到低界面张力所需矿化度的区域是逐渐降低的;研究还发现,含有分支结构的13AS-n-0系列表面活性剂的界面活性要比9AS-n-0好.

The interfacial tension between the aqueous solution of 9AS-n-0 and 13AS-n-0 series surfactants with different salinity and Zhuangxi106-x18-15 dehydration crude oil are measured at 55 ℃ by using Texa-500 interfacial tensiometer,and the effects of the structure of the surfactants and the salinity of the aqueous solution on the interfacial tension are studied.It is shown that,the interfacial tension decreases gradually with the increase of the salinity,and it reaches to the minimum value at a particular salinity;the salinity at minimum interfacial tension is decreasing with the increase of the chain length of propylene oxide;and the interfacial activity of 13AS-n-0 series surfactants which have branch structure is better than that of 9AS-n-0 series surfanctants.