Adsorption isotherms of associating asphaltenes at oil/water interfaces based on the dependence of interfacial tension on solvent activity

Horváth‐Szabó, Géza; Masliyah, Jacob H.; Elliott, Janet A.W.; Yarranton, Harvey W.; Czarnecki, Jan

doi:10.1016/j.jcis.2004.08.174

Cited by 50 publications

(34 citation statements)

References 57 publications

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“…One experimentally measurable quantity that can help to understand the emulsion stability is the interfacial tension (IFT) of the oil/water interface. , With the presence of asphaltenes, the IFT of oil/water interface decreases, which indicates the adsorption of asphaltenes onto the interface and thus hinders the coalescences of water droplets. , In addition, IFT can also be correlated with other important quantities, such as interfacial excess through the Gibbs adsorption isotherm − and critical micelle concentrations . Therefore, IFT parameters have been widely measured in experiments with the presence of asphaltene compounds under different conditions. , …”

Section: Introductionmentioning

confidence: 99%

Reduction of Water/Oil Interfacial Tension by Model Asphaltenes: The Governing Role of Surface Concentration

Jian¹,

Poopari²,

Liu³

et al. 2016

J. Phys. Chem. B

118

139

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In this work, pendant drop techniques and molecular dynamics (MD) simulations were employed to investigate the effect of asphaltene concentrations on the interfacial tension (IFT) of the oil/water interface. Here, oil and asphaltene were represented by, respectively, common organic solvents and Violanthrone-79, and two types of concentration, i.e., bulk concentration and surface concentration, were examined. Correlations between the IFTs from experiments and MD simulations revealed that surface concentration, rather than the commonly used bulk concentration, determines the reduction of oil/water IFTs. Through analyzing the hydrogen bonding, the underlying mechanism for the IFT reduction was proposed. Our discussions here not only enable the direct comparison between experiments and MD simulations on the IFTs but also help with future interfacial studies using combined experimental and simulation approaches. The methodologies used in this work can be extended to many other oil/water interfaces in the presence of interfacially active compounds.

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Section: Introductionmentioning

confidence: 99%

Reduction of Water/Oil Interfacial Tension by Model Asphaltenes: The Governing Role of Surface Concentration

Jian¹,

Poopari²,

Liu³

et al. 2016

J. Phys. Chem. B

118

139

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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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“…Asphaltenes are the most polar and heaviest compounds in the crude oil. They are composed of several polynuclear aromatic sheets surrounded by hydrocarbon tails, and form particles whose molar masses are included between 500 and 20,000 g [3]. They contain many functional groups, including some acids and bases [4,5].…”

Section: Introductionmentioning

confidence: 99%

Stability of water/crude oil emulsions based on interfacial dilatational rheology

Dicharry

Arla

Sinquin

et al. 2006

Journal of Colloid and Interface Science

191

164

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Adsorption isotherms of associating asphaltenes at oil/water interfaces based on the dependence of interfacial tension on solvent activity

Cited by 50 publications

References 57 publications

Reduction of Water/Oil Interfacial Tension by Model Asphaltenes: The Governing Role of Surface Concentration

Reduction of Water/Oil Interfacial Tension by Model Asphaltenes: The Governing Role of Surface Concentration

Understanding Mechanisms of Asphaltene Adsorption from Organic Solvent on Mica

Stability of water/crude oil emulsions based on interfacial dilatational rheology

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