Equilibrium partitioning of naphthenic acids and bases and their consequences on interfacial properties

Bertheussen, Are; Simon, Sébastien; Sjöblom, Johan

doi:10.1016/j.colsurfa.2017.05.068

Cited by 46 publications

(66 citation statements)

References 55 publications

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“…a and a. As mentioned earlier, there is some evidence of basic nitrogen‐containing, interfacially active components in bitumen, according to Yamamoto et al () and Bertheussen et al (). These components could not be removed from bitumen by alkaline extraction or precipitated via pentane addition; therefore, one would expect them to be present in all the four conditions of Figs.…”

Section: Resultsmentioning

confidence: 69%

“…Yamamoto et al () have identified the basic nitrogen heterocyclic compounds in bitumen. Bertheussen et al () determined that amines can produce a substantial reduction in interfacial tension in acidic environments. One fact that may be a cause for concern is the extremely large elasticity observed with the basic component present in the system h801 ( ε = 90 mJ m –2 ).…”

Section: Resultsmentioning

confidence: 99%

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Interfacial Activity of Bitumen Components

Stammitti

Bhanot

Boza

et al. 2020

J Surfact & Detergents

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The interfacial activity of asphaltenes, naphthenic acids, and naphthenates has been amply studied in the literature, as they are involved in the formation and stabilization of bitumen and heavy crude oil emulsions. While most of the literature evaluates one component at a time, in this work these bitumen components were separated one at a time from Athabasca bitumen, and the surface activity of the resulting fraction was evaluated as a function of pH, solvent aromaticity (heptane/toluene mixtures, known as heptol, at volume ratios 50/50 and 80/20), and temperature for selected systems. The interfacial activity was evaluated in two ways: via dynamic interfacial tension during adsorption on a bitumen drop of constant volume, and via dynamic interfacial tension during drop volume cycling. The adsorption data were interpreted using a model that combined multicomponent adsorption kinetics inspired by Langmuir-Freundlich kinetics with the Fainerman surface equation of state. The volume cycling experiments were interpreted using the compression relaxation model, which segregates adsorption/relaxation effects from elastic phenomena at interfaces. Overall, the adsorption data confirmed that naphthenic acids are the fastest adsorbing species that tend to dominate the interface, but that asphaltenes adsorb, almost irreversibly, at longer time scales and likely forming a sublayer previously proposed in the literature. The dilatational elasticity of the interface seems to be highly influenced by that asphaltene sublayer, which softens at high pH at room temperature, or at 80 C independently of the pH of the system. 642 J Surfact Deterg J Surfact Deterg (2020) 23: 641-659 643 J Surfact Deterg J Surfact Deterg (2020) 23: 641-659 N.C., not calculated; N.O., not observed. Green to red is a desirable to non-desirable scale. 646 J Surfact Deterg J Surfact Deterg (2020) 23: 641-659

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Section: Resultsmentioning

confidence: 69%

Section: Resultsmentioning

confidence: 99%

Interfacial Activity of Bitumen Components

Stammitti

Bhanot

Boza

et al. 2020

J Surfact & Detergents

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“…On the other hand, in interfacial tension studies, Bertheussen et al . 64 observed no interactions between the acids and bases, inferring that they do not exist simultaneously in dissociated form due to similar pK a values. Nenningsland et al .…”

Section: Surface Complexation Modelmentioning

confidence: 88%

“…For a crude oil with a high acid number (>1 mg/g KOH), most molecules at the oil water interface would be carboxylic acids 63 . Due to their amphiphilicity, acids and bases can adsorb and desorb at the oil-water interface, ultimately reaching a new equilibrium 64 . Generally, the effect of the acid fraction on the oil-water interface has been studied more extensively than the basic fraction.…”

Section: Surface Complexation Modelmentioning

confidence: 99%

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An overview of the oil-brine interfacial behavior and a new surface complexation model

Bonto

Eftekhari

Nick

2019

Sci Rep

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The few existing surface complexation models (SCM) for the brine-oil interface have important limitations: the chemistry of each crude oil is not considered, they cannot capture the water/non-polar hydrocarbons surface charge, the interactions between Na + and the acid sites are not included, and the equilibrium constants for the adsorption reactions are not validated against experimental data. We address the aforementioned constraints by proposing an improved diffuse-layer SCM for the oil-brine interface. The new model accounts for the chemistry of crude oils by considering surface sites linearly dependent on the TAN (total acid number) and TBN (total base number). We define weak sites to account for the negative surface charge observed for non-polar hydrocarbons in water. We optimize the parameters of our model by fitting the model to reported zeta potential measurements of oil in aqueous solutions. When we validate the optimized model against different experimental data sets, it generally shows a good performance in predicting the surface charge of oil in different brines with different pHs. We show that the acid and base numbers are only useful as a qualitative estimation of the distribution of polar groups at the oil surface, and more sophisticated analysis is necessary to quantify the chemistry of the oil-brine interface.

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Synergistic effect between surfactant and monoacid in inhibiting the formation of naphthenates

Silva,

Lucas

2024

Braz. J. Chem. Eng.

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Equilibrium partitioning of naphthenic acids and bases and their consequences on interfacial properties

Abstract: Highlights• Partitioning of acids and bases to determine water quality of produced water • Equilibrium partitioning of acids and bases vs pH, with or without calcium • No interfacial interactions were detected between acids and bases

Cited by 46 publications

References 55 publications

Interfacial Activity of Bitumen Components

Interfacial Activity of Bitumen Components

An overview of the oil-brine interfacial behavior and a new surface complexation model

Synergistic effect between surfactant and monoacid in inhibiting the formation of naphthenates

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