Roles of Various Bitumen Components in the Stability of Water-in-Diluted-Bitumen Emulsions

Yan, Zhoulin; Elliott, Janet A.W.; Masliyah, Jacob H.

doi:10.1006/jcis.1999.6533

Cited by 153 publications

(152 citation statements)

References 19 publications

Supporting

Mentioning

141

Contrasting

Unclassified

Order By: Relevance

“…The results from both techniques have been directly compared to show rapid drop coalescence (in seconds) when the film microstructure is dominated by the viscous component, and no coalescence when the interfacial microstructure transitions to a solid-like state and the elastic contribution dominates. The mechanism by which drop coalescence is prevented is believed to relate to: i) the high shear yield stress of the asphaltene film, in the order of ~10 4 Pa, formed by the gradual accumulation and rearrangement of asphaltene molecules within the film, and ii) the increasing elastic film stiffness that presents an energy barrier to film instabilities when in the solid-like state.…”

Section: Discussionmentioning

confidence: 99%

Problematic Stabilizing Films in Petroleum Emulsions: Shear Rheological Response of Viscoelastic Asphaltene Films and the Effect on Drop Coalescence

et al. 2014

View full text Add to dashboard Cite

Adsorption of asphaltenes at the water-oil interface contributes to the stability of petroleum emulsions by forming a networked film that can hinder drop-drop coalescence. The interfacial microstructure can either be liquid-like or solid-like, depending on: i) initial bulk concentration of asphaltenes, ii) interfacial aging time, and iii) solvent aromaticity. Two techniques: interfacial shear rheology and integrated thin film drainage apparatus provided equivalent interface aging conditions, enabling direct correlation of the interfacial rheology and droplet stability. The shear rheological properties of the asphaltene film were found to be critical to the stability of contacting droplets. With a viscous dominant interfacial microstructure, the coalescence time for two drops in intimate contact was rapid, on the order of seconds. However, as the elastic contribution develops and the film microstructure begins to be dominated by elasticity, the two drops in contact do not coalescence. Such step-change transition in coalescence is thought to be related to the high shear yield stress (~10 4 Pa), which is a function of the film shear yield point and the film thickness (as measured by quartz crystal microbalance), and the increased elastic stiffness of the film that prevents mobility and rupture of the asphaltene film which when in a solid-like state provides an energy barrier for the droplets to coalescence.

show abstract

Section: Discussionmentioning

confidence: 99%

Problematic Stabilizing Films in Petroleum Emulsions: Shear Rheological Response of Viscoelastic Asphaltene Films and the Effect on Drop Coalescence

et al. 2014

View full text Add to dashboard Cite

show abstract

“…4,15 Such precipitation may lead to the deposition of asphaltenes in production wells and pipelines (Figure 2a), resulting in the flow restriction, or even bringing oil production to a halt. 4,[15][16][17][18][19][20] In addition, asphaltenes play a significant role in the stabilization of water-in-oil (W/O) emulsions [21][22][23][24][25][26] (Figure 2b) which lead to severe corrosion problems in production and transportation due to the dissolved salts and entrained fine solids carried by emulsified water droplets. 4 Moreover, an oil with high content of asphaltenes tends to form coke when heated, which is highly detrimental to heat exchangers and catalyst beds in upgrading and refining.…”

Section: Saramentioning

confidence: 99%

Fractionation of Asphaltenes in Understanding Their Role in Petroleum Emulsion Stability and Fouling

et al. 2017

View full text Add to dashboard Cite

SARA fractionation separates the oil into fractions of saturates (S), aromatics (A), resins (R), and asphaltenes (A) based on the differences in their polarizability and polarity.Defined as a solubility class, asphaltenes are normally considered as a menace in the petroleum industry mainly due to their problematic precipitation and adsorption at oil water and oil-solid interfaces. As a broad range of molecules fall within the group of asphaltenes with distinct sizes and structures, considering the asphaltenes as a whole was noted to limit the deep understanding of governing mechanisms in asphaltene-induced problems.Extended-SARA (E-SARA) is being proposed as a concept of asphaltene fractionation according to their interfacial activities and adsorption characteristics, providing critical information to correlate specific functional groups with certain characteristics of asphaltene aggregation, precipitation and adsorption. Such knowledge obtained is essential to addressing asphaltene-related problems by targeting specific subfractions of asphaltenes for selective removal.2

show abstract

“…A similarity of all three methods is that the force -distance profiles are frequently measured at low approach velocity to minimize hydrodynamic effects, although recently there has been emphasis on studying hydrodynamic effects between a solid particle and a bubble, [18,19] a solid particle and a deformable droplet, [20,21] and two oil droplets [22,23] using high speed AFM.…”

Section: Measurement Of Colloidal and Surface Forcesmentioning

confidence: 99%

Studying bubble–particle interactions by zeta potential distribution analysis

Wang

Harbottle

et al. 2015

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

Over the last decade, Xu and Masliyah have pioneered an approach to characterize the interactions between particles in dynamic environments of multicomponent systems by measuring zeta potential distributions of individual components and their mixtures. Using a Zetaphoremeter, the measured zeta potential distributions of individual components and their mixtures were used to determine the conditions of preferential attachment in multicomponent particle suspensions. The technique has been applied to study the attachment of nano-sized silica and alumina particles to sub-micron size bubbles in solutions with and without the addition of surface active agents (SDS, DAH and DF250). The degree of attachment between gas bubbles and particles is shown to be a function of the interaction energy governed by the dispersion, electrostatic double layer and hydrophobic forces. Under certain chemical conditions, the attachment of nano-particles to sub-micron size bubbles is shown to be enhanced by in-situ gas nucleation induced by hydrodynamic cavitation for the weakly interacting systems, where mixing of the two individual components results in negligible attachment. Preferential interaction in complex tertiary particle systems demonstrated strong attachment between micron-sized alumina and gas bubbles, with little attachment between micron-sized alumina and silica, possibly due to instability of the aggregates in the shear flow environment.

show abstract

Roles of Various Bitumen Components in the Stability of Water-in-Diluted-Bitumen Emulsions

Cited by 153 publications

References 19 publications

Problematic Stabilizing Films in Petroleum Emulsions: Shear Rheological Response of Viscoelastic Asphaltene Films and the Effect on Drop Coalescence

Problematic Stabilizing Films in Petroleum Emulsions: Shear Rheological Response of Viscoelastic Asphaltene Films and the Effect on Drop Coalescence

Fractionation of Asphaltenes in Understanding Their Role in Petroleum Emulsion Stability and Fouling

Studying bubble–particle interactions by zeta potential distribution analysis

Contact Info

Product

Resources

About