Synergetic adsorption of asphaltenes and oil displacement surfactants on the oil-water interface: Insights on stabilization mechanism of the interfacial film
Synergetic adsorption of asphaltenes and oil displacement surfactants on the oil-water interface: Insights on stabilization mechanism of the interfacial film
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DOI：
10.1016/j.ces.2021.116850
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发表时间：
2021
影响因子：
4.7
通讯作者：
Hao Sun;Xiaoqing Li;Dandan Liu;Xiaobing Li
中科院分区：
文献类型：
--
作者：
Hao Sun;Xiaoqing Li;Dandan Liu;Xiaobing Li
本文主要研究了三元复合驱采出水中富含沥青质的水包油乳状液的界面稳定机理。首先，我们通过分子动力学模拟研究了沥青质和驱油表面活性剂在油/水界面上的吸附和聚集行为。计算了沥青质-十二烷基苯磺酸钠（SDBS）复合界面膜体系的界面形成能为−3423.9 kJ/mol，远高于SDBS单分子膜体系的界面形成能（−2499.9 kJ/mol）。这种增强的界面膜稳定性归因于沥青质和SDBS分子在油/水界面上的交联聚集。通过界面吸附热力学、微观形貌、界面张力和zeta电位分析，得到了各种界面体系的界面性质，进一步阐明了稳定化机理。该复合界面膜具有致密结构和高稳定性，是三元复合驱采出水油水分离的重要技术障碍。
This research focus on the interfacial stabilization mechanism of the asphaltene-rich oil-in-water emulsions that originated from the alkaline-surfactant-polymer (ASP) flooding produced water. Initially, we investigated the adsorption and aggregation behavior of asphaltenes and oil-displacement surfactants on the oil/water interface through molecular dynamics simulation. The interfacial formation energy for the composite asphaltenes-sodium dodecyl benzene sulfonate (SDBS) interfacial film system was calculated to be −3423.9 kJ/mol, which was much higher than that (−2499.9 kJ/mol) for the monolayer SDBS system. This enhanced interfacial film stability was attributed to the cross-linked aggregation of asphaltenes and SDBS molecules on the oil/water interface. Then, the interfacial properties of various interface systems were also obtained via interfacial adsorption thermodynamics, micromorphology, interfacial tension, and zeta potential analysis to further elucidate the stabilization mechanism. This composite asphaltenes-SDBS interfacial film with its pyknotic structure and high stability resulted in significant technical obstacles for oil-water separation of ASP flooding produced water.