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本文讨论了第三液相——ENSA的形成与应用。当含有亲有机溶剂憎盐性基团以及易离子化的磺酸根基团的α-萘酚聚氧乙烯醚(ENSA),从饱和氯化钠水溶液中用苯萃取时,即在水相与苯相间析出,形成不互溶、界面分明的第三液相。第三液相中ENSA分子具有取向性的特点。文中还拟定了盐析萃取-三相分离法测定电镀锡表面活性剂中EN、ENSA、硫酸以及ENSA中平均氧乙烯聚合数的方法。
This article discusses the formation and application of the third liquid phase --ENSA. When α-naphthol polyoxyethylene ether (ENSA) containing an organic-soluble salt-repellent group and an ionizable sulfonate group is extracted from a saturated sodium chloride aqueous solution with benzene, that is, in the aqueous phase with benzene Phase precipitation, the formation of immiscible, clear interface of the third liquid phase. ENSA molecules in the third liquid phase have the characteristics of orientation. The paper also developed a salting-out extraction - three-phase separation method for the determination of electroplated tin surfactants EN, ENSA, sulfuric acid and ENSA in the average polymerization number of ethylene oxide.