Journal
FUEL
Volume 283, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2020.119252
Keywords
Zwitterionic surfactant; Interfacial adsorption; Crude oil; Intermolecular interaction; Molecular simulation
Categories
Funding
- Natural Science Foundation of Shandong Provincial [ZR2019MEE077]
- National Natural Science Foundation of China [21203084]
- Fundamental Research Funds for the Central Universities [19CX02064A, 19CX05006A]
- Opening Fund of Shandong Key Laboratory of Oilfield Chemistry
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The molecular interactions between various components in crude oil and the zwitterionic surfactant DDPS were investigated using MD simulation and quantum chemistry calculations. DDPS molecules can form an organized adsorption layer at the crude oil surface, leading to the movement of components in both the hydrophobic interior and interfacial layer of crude oil droplets. Complex interactions (hydrophobic, electrostatic, and cationic) between DDPS molecules and components are responsible for the final distribution and configuration in the crude oil/water/DDPS system.
The intermolecular interaction between various components in crude oil, such as saturates, aromatics, resins, and asphaltenes, and the zwitterionic surfactant 3-(decyldimethylazaniumyl) propane-1 -sulfonate (DDPS) are investigated in detail via molecular dynamics (MD) simulation and quantum chemistry calculations. The radial distribution function (RDF) is calculated to reflect the effects of the charged functional group, aromatic ring, and hetematom on the component distribution and configuration in the crude oil droplet. The additional DDPS molecules could fabricate the well-organized adsorption layer at the crude oil surface to replace the original oil/water interface, leading to the obvious movement of the components in both hydrophobic interior and interfacial layer of crude oil droplet. Furthermore, the reduced density gradient (RDG) method is employed to visualize the intermolecular interaction. It is demonstrated that the complex interaction (hydrophobic, electrostatic, and cation-ic interaction) between DDPS molecules and related components should be responsible for the final distribution and configuration of various components in the crude oil/water/DDPS system.
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