Synergetic adsorption of asphaltenes and oil displacement surfactants on the oil-water interface: Insights on stabilization mechanism of the interfacial film

Sun, Hao; Li, Xiaoqing; Liu, Dandan; Li, Xiaobing

doi:10.1016/j.ces.2021.116850

Cited by 19 publications

(6 citation statements)

References 35 publications

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“…The larger the absolute value, the lower the interfacial tension. The calculation formula is as follows IFE = E t − false( n E S D S + E a i r − w a t e r false) n where E t is the total energy of the kinetic equilibrium system, kJ/mol; n is the number of gas–liquid interface surfactants SDS, pcs; E SDS is the energy contained in one SDS molecule, kJ/mol; and E air–water is the total energy of the gas–liquid system without SDS, kJ/mol.…”

Section: Resultsmentioning

confidence: 99%

Study on the Dual Effects of MgCl₂ on the Characteristics of Foams Stabilized by Sodium Dodecyl Sulfate

Cao,

Xia,

Zhao

et al. 2023

Ind. Eng. Chem. Res.

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In the application of foams in the industrial field, there are often high requirements for foaming ability and stability, but this brings greater pressure for defoaming. This paper discusses the evolution kinetics of aqueous foams stabilized by the anionic surfactant sodium dodecyl sulfate (SDS) under the influence of MgCl 2 . It is found that MgCl 2 has a dual effect on the performance of SDS foam, which is shown by the enhanced foaming ability and significantly improved stability but rapid defoaming when drained to a certain film thickness. This phenomenon not only increases efficiency in industrial applications but also facilitates recycling and defoaming. To clarify the mechanism behind this interesting phenomenon, we discuss the influence of MgCl 2 on bubbles, adsorption, film strength, disjoining pressure, surface tension, and rheological properties. The results show that the addition of MgCl 2 can significantly reduce the surface tension and interfacial formation energy and increase the adsorption of surfactant, film strength, and bulk phase viscosity. The size of the generated foam becomes smaller and more uniform. These factors together led to the enhancement of the stability of foam with the thicker liquid film. However, the addition of MgCl 2 can also have some detrimental effects on stability. For example, faster adsorption kinetics and higher surface strength lead to a weakening of the membrane repair capacity. Most importantly, when the liquid film is very thin, the surface adsorbed by SDS has a strong specific adsorption for Mg 2+ , which causes interfacial adhesion directly, leading to the instability of the thin liquid film. This paper provides theoretical guidance on the use of magnesium salts as additives, offering new ideas for combining high foam application performance and low defoaming difficulty.

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Section: Resultsmentioning

confidence: 99%

Study on the Dual Effects of MgCl₂ on the Characteristics of Foams Stabilized by Sodium Dodecyl Sulfate

Cao,

Xia,

Zhao

et al. 2023

Ind. Eng. Chem. Res.

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“…However, as the number of SDBS molecules continued to increase, the thickness of the cross-link structure decreased and “micelles” began to form (Figure e). This indicated that a critical micelle concentration (CMC, 400–1000 mg/L, varying with the properties of the solution) was reached. , Meanwhile, the interfacial thickness of the system is calculated based on the density distribution data, which is considered to be an important indicator of the natural interface . The total thickness at the interface is defined according to the “90–90%” principle which refers to the distance between the point on the water density curve equal to 90% of the water density in the bulk phase and 90% of the point on the oil density curve .…”

Section: Resultsmentioning

confidence: 99%

Effect of Oil-Displacing Agent Composition on Oil/Water Interface Stability of the Asphaltene-Rich ASP Flooding-Produced Water

Liu

Sun

et al. 2022

Langmuir

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In this work, the effect of oil-displacing agent composition on oil/water interface stability of the asphaltene-rich alkali–surfactant–polymer (ASP) flooding-produced water was systematically investigated, especially from the perspective of the interaction between oil displacement agents and asphaltene at the oil/water interface. Primarily, adsorption behavior of the artificial and natural interfacial substances (oil displacement surfactant and asphaltenes) on the oil/water interface was investigated by molecular dynamics simulation. The oil displacement surfactant and asphaltenes formed a cross-linked and compact interfacial film structure, which significantly enhanced the interface stability; the more the oil displacement surfactants adsorbed on the interface, the more stable is the cross-linked structure formed between them and asphaltenes. Then, the interfacial property variations that are originating from the interactions differences between oil displacement agents and asphaltenes were monitored via interfacial tension, zeta potential, and interfacial film rheology tests. Moreover, the effect of oil displacement agent concentrations on the interfacial film thinning and rupture kinetic behavior was further investigated. Finally, cream experiments were conducted to verify the effect of oil displacement agent composition on the oil/water separation efficiencies of asphaltene-rich ASP flooding-produced water. When 5% asphaltenes was added, the creaming oil removal rate reduced from 90.0 to 85.3% at 19 h. The interactions between asphaltenes and oil displacement agents immensely enhance the oil/water interfacial film strength and impede the oil/water separation process.

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“…Then, the boxes were assembled by using the Build Layers tool. After geometric optimization and annealing of the combined interface model, the dynamic balance of the model was 1500 ps under the NVT regular ensemble, , the simulated time step was 1 fs, the total number of steps was 1,500,000, and the total output was 300 frames. COMPASS force field was used for model construction and optimization, which can accurately simulate and predict the structure, conformation, vibration frequency, and thermodynamic properties of a single molecule or condensed matter in a wide range.…”

Section: Experimental Principles and Methodsmentioning

confidence: 99%

Molecular Dynamics Simulation of the Effects of Complex Surfactants on Oil–Water Interaction and Aggregation Characteristics at the Interface

Xian,

Ye,

Tang

et al. 2023

Langmuir

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In response to the problem of complex interaction between oil and water in the oil−water interface, especially heavy oil and water, this study investigated the effects of complex surfactants on the interaction of two phases and their aggregation characteristics by molecular dynamics simulation. The results showed that increasing the content of sodium lauryl polyether carboxylate (AEC-9Na) was beneficial to the coordination between it and alkyl glycoside (APG-10), improved the interfacial activity, and enhanced the interfacial stability of the composite system, and the best effect was achieved when AEC-9Na:APG-10 = 8:2. The thickness of the oil and water film on the oil−water interface was irregular. When the concentration of AEC-9Na was lower than that of APG-10, the total thickness of the interfacial film (t total ) first increased. When the content of AEC-9Na is higher, a large number of sodium ions were adsorbed near the −COO − group of AEC-9Na, which will polarize out of the hydration layer structure and attract water molecules from the second hydration layer on the heavy oil surface to the first hydration layer through electrostatic interaction. Then, the thickness of the interface film was compressed, and the interface film was reduced. When the ratio increased to 10:0, the oil and water phase competed to adsorb surfactant molecules, and the headgroup tended to lay on the interface. Moreover, the hydrophilicity of the surfactant layer was weakened, and the thickness of the water film decreased. The distribution of surfactant was looser than 8:2, the light components of heavy oil molecules (saturated and aromatic hydrocarbons) entered the gap between surfactants in large quantities, and the hydrophobic tail chain tended to be laid on the oil−water interface. The oleophilicity of the surfactant layer increased, and the thickness of the oil film remarkably increased, so the total thickness of the interface film increased again.

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Synergetic adsorption of asphaltenes and oil displacement surfactants on the oil-water interface: Insights on stabilization mechanism of the interfacial film

Cited by 19 publications

References 35 publications

Study on the Dual Effects of MgCl₂ on the Characteristics of Foams Stabilized by Sodium Dodecyl Sulfate

Study on the Dual Effects of MgCl₂ on the Characteristics of Foams Stabilized by Sodium Dodecyl Sulfate

Effect of Oil-Displacing Agent Composition on Oil/Water Interface Stability of the Asphaltene-Rich ASP Flooding-Produced Water

Molecular Dynamics Simulation of the Effects of Complex Surfactants on Oil–Water Interaction and Aggregation Characteristics at the Interface

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Synergetic adsorption of asphaltenes and oil displacement surfactants on the oil-water interface: Insights on stabilization mechanism of the interfacial film

Cited by 19 publications

References 35 publications

Study on the Dual Effects of MgCl2 on the Characteristics of Foams Stabilized by Sodium Dodecyl Sulfate

Study on the Dual Effects of MgCl2 on the Characteristics of Foams Stabilized by Sodium Dodecyl Sulfate

Effect of Oil-Displacing Agent Composition on Oil/Water Interface Stability of the Asphaltene-Rich ASP Flooding-Produced Water

Molecular Dynamics Simulation of the Effects of Complex Surfactants on Oil–Water Interaction and Aggregation Characteristics at the Interface

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Study on the Dual Effects of MgCl₂ on the Characteristics of Foams Stabilized by Sodium Dodecyl Sulfate

Study on the Dual Effects of MgCl₂ on the Characteristics of Foams Stabilized by Sodium Dodecyl Sulfate