Demulsification of water-in-oil emulsions by exposure to magnetic field

Romanova, Yuliya N.; Maryutina, Tatiana A.; Musina, Natalya S.; Yurtov, E. V.; Spivakov, B. Ya.

doi:10.1016/j.petrol.2019.05.002

Cited by 34 publications

(7 citation statements)

References 13 publications

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“…Emulsified water droplets often carry elevated concentrations of salts, leading to fouling and corrosion in refinery units. − Furthermore, organic-laden produced waters can cause environmental hazards to air quality, aquatic lives, and crop production . Separation technologies are usually complex, , energy-intensive, , time-consuming, and costly. , Consequently, successful demulsification requires a structural identification of the interfacial species and a fundamental understanding of their stabilization mechanism. ,, …”

Section: Introductionmentioning

confidence: 99%

“…5 Separation technologies are usually complex, 6,7 energy-intensive, 7,8 time-consuming, 8 and costly. 2,7 Consequently, successful demulsification requires a structural identification of the interfacial species and a fundamental understanding of their stabilization mechanism. 4,6,9 The kinetic stability of oil/water (o/w) emulsions is mainly attributed to the formation of a protective film at the interface formed by indigenous components of crude oils such as asphaltenes.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of the Interfacial Material in Asphaltenes Responsible for Oil/Water Emulsion Stability

2020

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This study aimed at a better understanding of the structure and properties of the most interfacially active asphaltenes responsible for the stability of oil/water emulsions. Interfacial material (IM) was extracted from three different crude oils using a modified solvent washing procedure. Structural parameters of IM were analyzed and compared to those of a parent asphaltene. High-resolution microscopy imaging was performed to correlate IM microstructure to their interfacial properties. Although IM and asphaltene fractions had comparable molecular weights, IM species had a smaller aromatic core than asphaltenes with at least one linear fatty acid chain containing a sulfinic or carboxylic group. This subtle difference conferred them with an amphiphilic character that promoted their self-assembly into 2–6 nm thick worm-like aggregates in solution instead of spherical clusters. IM molecules interacted with water through their fatty acid chains while simultaneously π–π stacking with adjacent molecules. These two types of interactions favored their multilayer growth and the formation of stable interfacial films around water droplets that significantly lowered the oil/water interfacial tension. High-resolution microscopy imaging of the interfacial films revealed the presence of flexible nanosheets that are 10–50 nm thick. The nanosheets provided a large surface area on which asphaltene clusters (smaller than 20 nm) and fine clay particles (100–200 nm) adsorbed. Even though multiple washings were performed to extract IM, there were still traces of asphaltenes present in this fraction as well as 10–30 wt % of clays, depending on the type of crude oil. The latter induced some artifacts when analyzing the properties of the most interfacially active asphaltenes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of the Interfacial Material in Asphaltenes Responsible for Oil/Water Emulsion Stability

2020

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“…So, the difficulty of dehydration is usually greater than that of oil-in-water (O/W) emulsions. There are different methods to separate oil and water, such as chemical, biological, and physical treatments. − An electric field can evidently influence the morphology of a microstructure . In the W/O system, applying an electric field can cause water droplets to polarize or migrate.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Study on the Demulsification Mechanism of Water-In-Oil Emulsion with SDS Surfactant under a DC Electric Field

Yuan

Zhang

et al. 2022

Langmuir

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Application of an electric field is an effective demulsification method for water-in-oil (W/O) emulsions. For the W/O emulsions stabilized by anionic surfactants, the microscopic demulsification mechanism is still not very clear. In this work, the coalescence behavior of two droplets stabilized by the anionic surfactant sodium dodecyl sulfate (SDS) in the oil phase under a DC electric field is investigated by molecular dynamics simulation. The effects of electric field strength and oil type on the electrocoalescence of two water droplets are mainly considered. The trajectory snapshots and center of mass of the two water droplets suggest that there is almost no migratory coalescence. The movement of sodium ions and SDS, which is a combined effect of the electric field force and the resistance from the oil phase, is crucial for the deformation and connection of two water droplets. The results of mean square displacement, radial distribution function, hydration number, and interaction energies of Na + -H 2 O and SDS-H 2 O indicate that the sodium ion has a stronger ability to carry water molecules for movement than SDS. The stronger electric field strength will result in more severe deformation and shorter coalescence time. Under the higher electric field strength, the two droplets will be elongated into a slender water ribbon. By applying a pulsed DC electric field with suitable amplitude, frequency, and duty ratio, it is possible to achieve full coalescence for the ionic surfactant-stabilized W/O emulsions. The oil phase also plays an important role for the deformation of droplets and the migration of emulsion components. For the different oil phases, a longer time or stronger electric field strength would be needed for the electrocoalescence of droplets in the oil phase with higher density and viscosity. Our results are expected to be helpful for practical application in the petroleum industry and chemical engineering.

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“…[6] Recently, different de-emulsification techniques have been proposed to avoid de-emulsifier costs and associated problems. These methods are based on physical processes, including magnetic field, [7,8] external alternating current (AC) electric field, [9] ultrasound, [10,11] solar energy, [12,13] and microwave (MW). [14][15][16][17][18] For the oil-in-water emulsions, the emulsions can be removed effectively with air bubbles.…”

Section: Introductionmentioning

confidence: 99%

In‐situ monitoring of decane‐in‐water emulsion during microwave irradiation

et al. 2022

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Microwave (MW)-assisted de-emulsification has been attractive in processes of petroleum production and refining. However, the mechanism and optimal operation remain poorly understood. In this study, the behaviour of decane-inwater emulsion under MW irradiation was monitored in-situ through a size measurement system equipped with the reactor and surface tension profiles.The results indicated that the bubble was formed around the oil droplet during MW irradiation. The MW-induced bubbles can enhance de-emulsification in a similar mechanism as the flotation column. The efficiency of MW de-emulsification depends on emulsion content and MW power. Although a higher MW power is more effective, boiling caused by excessive energy must be considered due to the higher local heating. As a result, moderate power is more desirable. For the decane-in-water emulsions in this study, the optimal condition was determined to be around 500 W.

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Demulsification of water-in-oil emulsions by exposure to magnetic field

Cited by 34 publications

References 13 publications

Characterization of the Interfacial Material in Asphaltenes Responsible for Oil/Water Emulsion Stability

Characterization of the Interfacial Material in Asphaltenes Responsible for Oil/Water Emulsion Stability

Molecular Dynamics Study on the Demulsification Mechanism of Water-In-Oil Emulsion with SDS Surfactant under a DC Electric Field

In‐situ monitoring of decane‐in‐water emulsion during microwave irradiation

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