脂肪醇醚羧酸盐表面活性剂复配体系相行为

Phase Behavior of Mixture of Alkyl Ether Carboxylate Surfactants with Different Cationic Surfactants

使用脂肪醇醚羧酸盐表面活性剂与十六烷基三甲基氯化铵进行了阴阳复配体系的相行为研究。通过对阴阳离子比例、盐度、聚醚(EO)数和不同阳离子表面活性剂的相态实验考察,总结了表活剂结构、复配比例、盐度以及聚醚数对于阴阳复配体系相行为的影响,筛选出了该不同复配体系所适合的最佳盐度,分别为30,100,200g/L。同时测试了单一表面活性剂以及该类复配体系的临界胶束浓度与表面张力,证明了该类复配体系具有较低的临界胶束浓度(约2 mg/L)、有效降低表面张力(最低可达32 mN/m),超低界面张力(约2.0×10-3mN/m)和高增溶油的能力(增溶参数达12)。该结果为今后针对不同油藏条件,研发新型阴阳复配表面活性剂配方提供了实验支持,具有一定的现场应用可能性.

The phase behavior of alkyl ether carboxylate surfactants with cationic surfactant was studied.The effects of anionic surfactant structure,molar ratio,salinity and group number of polyether on the phase behavior of the anionic-cationic complex system were investigated by the phase behavior experiment.The optimum salinities were found out for the different mixtures as 30 g/L,100 g/L and 200 g/L.The critical micelle concentration(CMC)and surface tension of anionic surfactants,cationic surfactants and the mixture of anionic-cationic surfactants were tested.The results showed that these mixtures produced ultralow CMC(2 mg/L),low surface tension(32 mN/m),and high oil solubilization parameter(SP=12).The experiment results were possibly useful in developing new mixture of anionic/cationic surfactant used for enhanced oil recovery(EOR)application in different reservoir in the future.