Water-in-Hydrocarbon Emulsions Stabilized by Asphaltenes at Low Concentrations

Yarranton, Harvey W.; Hussein, Hisham; Masliyah, Jacob H.

doi:10.1006/jcis.2000.6938

Cited by 289 publications

(255 citation statements)

References 19 publications

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“…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

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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

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Section: Saramentioning

confidence: 99%

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

et al. 2017

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“…The interactions and assembly of adsorbed molecules or their aggregates lead to formation of a protective layer that resists droplet-droplet coalescence. [1][2][3][4][5][6][7][8][9][10][11] Stable emulsions have been a major challenge in petroleum production, affecting process throughput and downstream operations such as upgrading. It is necessary to develop knowledge on the formation of these protective layers to design suitable protocols for film disruption and prevention of stable emulsion formation.…”

Section: Introductionmentioning

confidence: 99%

Understanding Mechanisms of Asphaltene Adsorption from Organic Solvent on Mica

et al. 2014

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The adsorption process of asphaltene onto molecularly smooth mica surfaces from toluene solutions of various concentrations (0.01 -1 wt%) was studied using a Surface Forces Apparatus (SFA). Adsorption of asphaltenes onto mica was found to be highly dependent on adsorption time and concentration of the solution. The adsorption of asphaltenes led to an attractive bridging force between the mica surfaces. The adsorption process was identified to be controlled by diffusion of asphaltenes from the bulk solution to the mica surface with a diffusion coefficient on the order of 10 -10 m 2 /s at room temperature, depending on asphaltene bulk concentration. This diffusion coefficient corresponds to a hydrodynamic molecular radius of approximately 0.5 nm, indicating that asphaltene diffuses to mica surfaces as individual molecules at very low concentration (e.g. 0.01 wt%). Atomic force microscopy (AFM) images of the adsorbed asphaltenes on mica support the results of the SFA force measurements. The results from the SFA force measurements provide an insight on the molecular interactions (e.g. steric interaction, bridging attraction as a function of distance) of asphaltenes in organic media and hence their roles in crude oil and bitumen production.

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“…The tendency of asphaltenes to self-aggregate distinguishes them from other oil constituents. Asphaltene aggregation is the cause of complex non-linear effects in such phenomena as adsorption at solid surfaces, precipitation, fluid's rheology, emulsion stability, etc (70,71) . Asphaltenes are regarded to be polar species, formed by condensed poly aromatic structures, containing alkyl chains, hetero atoms (such as O, S and N) and some metals.…”

Section: Asphaltenesmentioning

confidence: 99%

Factors Affecting the Stability of Crude Oil Emulsions

Abdel-Raouf¹

2012

Crude Oil Emulsions- Composition Stability and Characterization

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Water-in-Hydrocarbon Emulsions Stabilized by Asphaltenes at Low Concentrations

Cited by 289 publications

References 19 publications

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

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

Understanding Mechanisms of Asphaltene Adsorption from Organic Solvent on Mica

Factors Affecting the Stability of Crude Oil Emulsions

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