Understanding Interfacial Behavior of Ethylcellulose at the Water–Diluted Bitumen Interface

Hou, Jun; Feng, Xianhua; Masliyah, Jacob H.; Xu, Zhenghe

doi:10.1021/ef201722y

Cited by 62 publications

(58 citation statements)

References 21 publications

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“…This high displacement activity of hydrocarbon contaminants from solid interface by EC has been reported in recent studies. 29,42,43 Using quartz crystal microbalance with dissipation (QCM-D) and atom force microscopy (AFM), for example, Wang et al 29 detected the irreversible adsorption of EC on asphaltenes-and bitumentainted silica or alumina. Interestingly, Figure 5c shows that the addition of each solvent (toluene or naphtha) had a negligible effect on the equilibrium receding contact angles for EC-treated glass surfaces.…”

Section: Resultsmentioning

confidence: 99%

Dewetting Dynamics of a Solid Microsphere by Emulsion Drops

Lin

Primkulov

et al. 2014

J. Phys. Chem. C

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A novel micropipet technique was developed to quantify the dewetting dynamics of individual microsphere particles by emulsified viscous crude oil drops in aqueous media. This technique allowed dynamic microscale receding contact angles of water to be measured in situ for solid−oil−water systems. System parameters, including modification of glass microspheres and characteristics of oil drops, were varied to study their effect on dewetting dynamics of the systems. Increasing solvent dosage in viscous oil was found to decrease static receding contact angle of water for clean and bitumen-treated glass surfaces, but showed a negligible effect on static receding contact angle for ethyl cellulose (EC)-treated glass surface. Interestingly, dynamic dewetting behavior exhibited a strong dependence on surface modification and the addition of solvent to viscous oil. No dewetting dynamics was observed for clean hydrophilic glass surface. For bitumen-or EC-treated glass surfaces, more rapid dewetting dynamics of water were determined with increasing addition of solvent to viscous oil. Both de Gennes viscous dissipation hydrodynamic and the Blake/Haynes molecular-kinetic models were developed for the current system to understand the observed dynamic dewetting characteristics.

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Section: Resultsmentioning

confidence: 99%

Dewetting Dynamics of a Solid Microsphere by Emulsion Drops

Lin

Primkulov

et al. 2014

J. Phys. Chem. C

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“…Furthermore, interfacial dilatational rheology was used to couple these results with features related to the elasticity of the film formed at the liquid-liquid interface. Asphaltene desorption has been traditionally studied at the solid-air or liquid-air interfaces through Langmuir trough, Langmuir-Blodgett films (LB), Brewster angle microscopy (BAM) 4,13,15,[64][65][66] and quartz crystal microbalance technique 4,67,68 . In this work, a study at the liquid-liquid interface is proposed.…”

Section: Discussionmentioning

confidence: 99%

“…Even though the formation of a mechanically strong asphaltene film has been postulated as the main mechanism for water-in-crude oil emulsion stability 7,13,15,59,60 , in this case such formation would be difficult. If both surface active compounds (i.e.…”

Section: Competitive Adsorptionmentioning

confidence: 99%

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Mixed Interfaces of Asphaltenes and Model Demulsifiers, Part II: Study of Desorption Mechanisms at Liquid/Liquid Interfaces

2015

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This article is the continuation of a preceding paper (Part I) in which the adsorption and desorption of asphaltenes from the oil/water interface by pure solvent and model demulsifiers was studied. In this second part, the composition of mixed interfaces of asphaltenes and two demulsifiers (Brij®-93 and Pluronic® PE8100) was studied. Desorption of asphaltenes by demulsifiers, and vice versa, was determined. First, the composition of a mixed interface (asphaltenes and demulsifiers) through the use of the Langmuir equation of state (EoS) was determined. Second, an experimental set-up that mimics, to some extent, the chemical demulsification of water-in-crude oil emulsions during the production stages was used.Desorption of already adsorbed asphaltenes at the liquid-liquid interface by the action of two demulsifiers was assessed. It was found that desorption is always initiated by interactions between demulsifiers and asphaltenes. It is followed by the plausible formation of complexlike structures to finally end in the replacement, by displacement from the interface, of asphaltenes by demulsifiers. Third, the assessment of Brij®-93 and PE8100 desorption from the oil/water interface by the action of asphaltenes was also carried out. It was found that asphaltenes can desorb PE8100 at low surface coverage.

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“…18,19 To overcome such issues and enhance oil dewatering performance, chemical additives such as dispersants and demulsifiers are typically added at the ppm level to break particle and interfacial networks, thus promoting droplet-droplet coalescence. [20][21][22] Chemical demulsifiers are designed to actively compete at the liquid-liquid interface and disrupt the rigid networks which have formed a protective barrier around water droplets. 20,21,23,24 To facilitate their interfacial activity, demulsifier molecules must demonstrate an appreciable level of amphiphilicity to partition at the oil-water interface.…”

Section: Introductionmentioning

confidence: 99%

Molecular Interactions between a Biodegradable Demulsifier and Asphaltenes in an Organic Solvent

et al. 2016

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A surface forces apparatus (SFA) was used to measure the intermolecular forces between a biodegradable demulsifier (ethyl cellulose, EC) and asphaltenes immobilized on two molecularly smooth mica surfaces in an organic solvent. A steric repulsion on approach between the immobilized EC layers and asphaltenes was measured, despite strong adhesion during retraction. The measured adhesion was attributed to the interpenetration and tangling of aliphatic branches of swollen asphaltenes and solvated chains of EC macromolecules. Competitive adsorption of EC on/in immobilized asphaltene layers was confirmed by combining SFA force measurements and atomic force microscopy (AFM) imaging. Following the injection of EC-in-toluene solution, an immediate (< 5 min) increase in the confined layer thickness of the immobilized asphaltenes layers was measured. Irreversibly adsorbed asphaltenes were displaced by EC macromolecules through binding with unoccupied surface sites on mica, followed by the spreading of EC across the mica substrate due to increased surface activity governed by the higher number of hydroxyl groups per EC molecule. AFM imaging confirmed that the increase in confined layer thickness resulted from the formation of larger asphaltene aggregates/clusters protruding from the mica substrate.Molecular level topographical images showed that the asphaltenes were not re-solvated in the -2 -organic phase but more self-associated as the EC macromolecules spread across the hydrophilic mica substrate. The results from this study provide not only fundamental insights into the basic interaction mechanisms of asphaltenes and EC macromolecules as a demulsifier in organic media, but also directions towards enhancing demulsification of water-in-oil emulsions.

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Understanding Interfacial Behavior of Ethylcellulose at the Water–Diluted Bitumen Interface

Cited by 62 publications

References 21 publications

Dewetting Dynamics of a Solid Microsphere by Emulsion Drops

Dewetting Dynamics of a Solid Microsphere by Emulsion Drops

Mixed Interfaces of Asphaltenes and Model Demulsifiers, Part II: Study of Desorption Mechanisms at Liquid/Liquid Interfaces

Molecular Interactions between a Biodegradable Demulsifier and Asphaltenes in an Organic Solvent

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