On the synergistic effect of asphaltene and surfactant to reduce <i>n</i>-dodecane–water interfacial tension: insights from molecular dynamics simulations

Peng, Baoliang; Xiao, Shaofei; Wang, Yuanyuan; Zhou, Qu; Yuan, Lingfang; Liu, Weidong; Hou, Qingfeng; Tang, Xianqiong; Pei, Yong

doi:10.1080/08927022.2022.2072494

Cited by 7 publications

(4 citation statements)

References 50 publications

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“…Asphaltenes and resins are naturally occurring interfacially active substances that are often thought to be responsible for the formation of highly undesirable, stable crude oil-in-water emulsions and crumb layers that have the effect of reinforcing the stability of oil sludge emulsions. , Although asphaltenes do not have the well-defined amphiphilic structural characteristics of surfactants, studies have shown that they can stabilize water-in-oil emulsions . Asphaltenes and resins are the main components of polar fractions of crude oil.…”

Section: Resultsmentioning

confidence: 99%

Analysis of the Changes in the Components of the Chemical Hot Washing Treatment of Oily Sludge and the Mechanism of Oil Removal

Yan,

Tong,

et al. 2023

Ind. Eng. Chem. Res.

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Oily sludge is both a hazardous waste and a resource that contains significant amounts of recoverable mineral oil, while the recovery and reduction of mineral oil are the main methods of reducing the hazardous characteristics of oily sludge. In this study, chemical hot washing was used to treat oily sludge from an oilfield in Xinjiang, China, and the optimum detergent formulation and optimal process parameters were obtained through chemical compounding and process parameter optimization. The mechanism of oil removal was explored through a variety of different components of crude oil. The results show that the compound detergent AXQ (sodium phosphate/ sodium carbonate = 4:6) can reduce the oil content of oily sludge from 20.13 to 1.55% at a dosing rate of 1.5%, 70 °C, a solid−liquid ratio of 1:5, a stirring rate of 400 rpm, a stirring time of 20 min, a pH value of 9, a centrifugal speed of 3000 rpm, a centrifugal time of 10 min, and an oil removal rate of 92.30%, meeting the DB 65/T 3998-2017 treatment standard. Chemical thermal washing removed most of the mineral oil, with 93.47, 95.38, 63.35, and 79.47% removal of the four components, respectively, and gas chromatography analysis indicated that most of the low carbon number petroleum hydrocarbons prior to n-heptadecane were removed. Analysis of the different crude oil components after hot washing shows that the alkaline inorganic salts destroy the stable emulsion system formed by naturally occurring interfacially active substances like asphaltene and resin through electrical neutralization, achieving a three-phase separation of oil, water, and solids and laying the foundation for mineral oil removal.

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Section: Resultsmentioning

confidence: 99%

Analysis of the Changes in the Components of the Chemical Hot Washing Treatment of Oily Sludge and the Mechanism of Oil Removal

Yan,

Tong,

et al. 2023

Ind. Eng. Chem. Res.

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“…Regarding reduction in aggregate size, surfactants can also reduce asphaltene aggregate sizes; different synergistic interactions between surfactants and asphaltene molecules can reduce interfacial tension 162 . The breakdown of the asphaltene molecular aggregation structure occurs for the surfactants sodium dodecylbenzene sulfonate (SDBS) and octylphenol polyoxyethylene ether (OP-10) as the interfacial concentration increases.…”

Section: Simulation Approachmentioning

confidence: 99%

“…Asphaltene aggregation rose in response to an increase in surfactant interfacial concentration 22,40,129 . The action of surfactant and asphaltene is not favourable to further reducing the interfacial tension as the concentration of surfactant at the interface rises 162 . In tight light oil reservoirs, CO2 injection frequently occurs in conjunction with asphaltene precipitation.…”

Section: Simulation Approachmentioning

confidence: 99%

Asphaltene Modeling, Emulsion, and Aggregation: A Review

Moud¹

2022

Preprint

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Asphaltene is a component of crude oil that, if mishandled, may create substantial transportation and industrial concerns. It is a solid by nature, with a diverse set of molecular compositions. Furthermore, the oil industry has identified emulsion generation and clogging precipitate as key concerns. The emulsified water droplets in the process are just what give the raw oil its increased viscosity; hence, power is squandered to transport the oil around. The information has been separated into sections based on simulation, solubilization, agglomeration, precipitation, and evidence of model chemicals in the literature. We have included research that investigates the bulk rheology and interfacial rheology of asphaltene to describe its interfacial activity more clearly.

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“…Liang et al got similar results. Liang et al studied the interfacial characteristics of the oil–water interface with asphaltene. − Guan et al simulated a variety of heavy oil dissolution systems with continental asphaltene molecules, using the SU-DPD method. The results were consistent with the Yen-Mullins model and experimental results.…”

Section: Introductionmentioning

confidence: 99%

Mesoscopic Simulation of Aggregate Characteristics of Asphaltene Molecules Under Shear Fields

Wu,

2024

ACS Omega

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Behaviors of asphaltene molecules in toluene under a shear force field were investigated by dissipative particle dynamics (DPD). The results showed that asphaltene molecules aggregated into nanoaggregates (NAs) in three forms, mainly in the face-toface type, which contained up to 7 asphaltene molecules. In the aggregates, the distance between aromatic sheets (ASes) of adjacent asphaltene molecules was about 6 Å, and the minimum was 5.49 Å. The composition of NAs changed dynamically. In the absence of shear, the aggregates lasted for more than 3000 ps and up to 8000 ps. The asphaltene molecules in an aggregate might reaggregate once dispersed. Both the number and size of the aggregates decreased under the shear force field, and the duration decreased to less than 1000 ps. The direction of the ASes was distributed randomly when the shear rate was zero. Once sheared, the angle between the ASes and the shear force field plane decreased while the range of it expanded. The ASes tended to be parallel to the shear field and the angle between the two concentrated below 40°. As the shear rate increased, the angle decreased and the distribution was more concentrated.

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On the synergistic effect of asphaltene and surfactant to reduce n-dodecane–water interfacial tension: insights from molecular dynamics simulations

Cited by 7 publications

References 50 publications

Analysis of the Changes in the Components of the Chemical Hot Washing Treatment of Oily Sludge and the Mechanism of Oil Removal

Analysis of the Changes in the Components of the Chemical Hot Washing Treatment of Oily Sludge and the Mechanism of Oil Removal

Asphaltene Modeling, Emulsion, and Aggregation: A Review

Mesoscopic Simulation of Aggregate Characteristics of Asphaltene Molecules Under Shear Fields

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