Asadabadi Simin, Saien Javad, Kharazi Mona
Department of Applied Chemistry, Faculty of Chemistry and Petroleum Sciences, Bu-Ali Sina University Hamedan 6517838695 Iran +98 8131408080
RSC Adv. 2024 Jun 12;14(27):18942-18949. doi: 10.1039/d4ra02092h.
Conventional surfactants encounter limitations for application in oil reservoirs; however, combining surface-active ionic liquids (SAILs) with conventional surfactants presents an opportunity to enhance the interfacial properties of crude oil-water systems, giving also economic benefits. Accordingly, blends of a long-chain cationic imidazolium-based SAIL, namely, 1-dodecyl-3-methylimidazolium chloride, [Cmim][Cl], and the anionic conventional surfactant, sodium dodecyl sulfate were investigated here. Initial experiments with individual surfactants revealed efficient adsorption and consistent adsorption parameters. Subsequently, the use of mixtures showed synergistic effects for interfacial tension reduction of up to 86.0%, and critical micelle concentration reduction of 72.1% compared to the linear contribution of individual components. These improvements were observed at the optimal SAIL mole fraction of 0.3 and the mixture concentration of 0.003 mol dm, resulting in interfacial tension reduction from 29.1 to 1.6 mN m as well as achieving a low critical micelle concentration of 2.7 × 10 mol dm coinciding with 83.6% synergy. These findings underscore the favorable interactions between oppositely charged components in the mixtures, amplifying their activity beyond the linear contributions of the individual surfactants. Additionally, theoretical assessments using the Gibbs adsorption equation and the Rosen model provided insight into the adsorption behavior of both the individual surfactants and their mixtures, together with reasonable variations in the corresponding parameters.
传统表面活性剂在油藏应用中存在局限性；然而，将表面活性离子液体（SAILs）与传统表面活性剂相结合，为增强原油 - 水体系的界面性质提供了契机，同时还具有经济效益。因此，本文研究了一种基于长链阳离子咪唑鎓的SAIL，即1 - 十二烷基 - 3 - 甲基咪唑氯化物[Cmim][Cl]与阴离子传统表面活性剂十二烷基硫酸钠的混合物。对单一表面活性剂的初步实验揭示了其高效吸附性和一致的吸附参数。随后，混合物的使用显示出协同效应，与各组分的线性贡献相比，界面张力降低高达86.0%，临界胶束浓度降低72.1%。在SAIL的最佳摩尔分数为0.3和混合物浓度为0.003 mol dm时观察到了这些改善，导致界面张力从29.1降低到1.6 mN m，同时实现了2.7×10 mol dm的低临界胶束浓度，协同效应达83.6%。这些发现强调了混合物中带相反电荷的组分之间的良好相互作用，其活性超过了单一表面活性剂的线性贡献。此外，使用吉布斯吸附方程和罗森模型进行的理论评估，深入了解了单一表面活性剂及其混合物的吸附行为，以及相应参数的合理变化。
