Adsorption mechanism of asphaltenes and surfactants at oil-water interface: based on dissipative particle dynamics method

耗散颗粒动力学模拟 沥青质 吸附 化学工程 粒子(生态学) 机制(生物学) 化学 化学物理 材料科学 有机化学 地质学 物理 海洋学 量子力学 工程类 聚合物
作者
Xiaoyan Liu,Chonghao Liang,Hui Jiang,Chuan Ma,Yongying Jia
出处
期刊:Journal of Dispersion Science and Technology [Informa]
卷期号:: 1-11 被引量:1
标识
DOI:10.1080/01932691.2024.2327419
摘要

The study of emulsion stabilization mechanisms is of great importance in the field of crude oil extraction, transportation and processing. In order to further investigate the roles of asphaltenes and surfactants in the emulsion stabilization process, the adsorption mechanisms of asphaltenes and surfactants at the oil-water interface were investigated using dissipative particle dynamics. The results show that: the asphaltene interfacial film gradually becomes thicker before the saturation adsorption of asphaltene molecules at the oil-water interface, and the interfacial tension decreases with the increase of the number of molecules until it reaches the equilibrium state; different surfactant molecules have different influences on the interface, and the calculations of the radial distribution function and the interfacial tension show that H2T4 molecules have a stronger effect than H4T4 at the oil-water interface and have stronger surface activity. H2T4 reaches saturation adsorption capacity faster than H4T4 and has higher interfacial efficiency. The asphaltene-surfactant composite system can stabilize the oil-water interface more effectively. Competitive and synergistic effects of asphaltene and surfactant in the process of interfacial adsorption. When the concentration of surfactant in the composite system is low, there is a synergistic effect between the two in the interfacial adsorption process; when the concentration of surfactant is high, there is a competitive effect between the two in the synergistic adsorption process. The surfactant H4T4 has both interfacial adsorption and self-aggregation in the competitive adsorption process. This paper provides ideas for exploring the kinematic laws of molecular behavior in the stabilization mechanism of crude oil emulsions.
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