Characterization of Polarity-Based Asphaltene Subfractions

Wattana, Piyarat; Fogler, H. Scott; Yen, Andrew; García, María del Carmen García; Carbognani, Lante

doi:10.1021/ef0499372

Cited by 134 publications

(106 citation statements)

References 24 publications

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“…In fact, they showed that high-polarity fractions have a great tendency to aggregate and are more difficult to remediate. 105 Continental asphaltenes are more polar than archipelago asphaltenes and are expected to aggregate more in toluene than archipelago structures. Thus, the heaviest asphaltene aggregates are thought to belong to the continental model.…”

Section: Resultsmentioning

confidence: 99%

Effect of Chemical Composition on Asphaltenes Aggregation

et al. 2010

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1 H DOSY NMR experiments were used to investigate the macrostructure of the asphaltenes of Maya, Athabasca, and Buzurgan feedstocks in toluene-d 8 at 20°C. The influence of the concentration of asphaltenes on their diffusion coefficients is presented for the three asphaltenes. A separation between two classes of aggregates-one diffusing quickly and one diffusing more slowly-was observed at an onset concentration that is dependent upon the origin of the sample. This illustrates that the chemical interactions (and, hence, the chemical structures) are different for the three asphaltenes. Because asphaltenes are a continuum of both archipelago and continental asphaltenes, the interactions in the solutions differ, depending on the repartition between archipelago-and continental-type asphaltenes in the feed. Maya and Buzurgan asphaltenes show similar diffusion properties in the dilute regime, while Athabasca asphaltenes diffuse more slowly. Results obtained from DOSY experiments data seem to indicate that Buzurgan asphaltenes show a more continental character than the two other asphaltenes, while Athabasca asphaltenes seem to contain more archipelago asphaltenes. 1 H and 13 C NMR experiments were also performed to determine the average structural parameters of asphaltenes. Average sizes and molecular weights were determined from the 1 H-DOSY NMR diffusion coefficients and compared to size exclusion chromatography (SEC) data.

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Section: Resultsmentioning

confidence: 99%

Effect of Chemical Composition on Asphaltenes Aggregation

et al. 2010

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“…Both resin and asphaltene affected the polarity, the association between intramolecular and intermolecular were important even at low concentrations. The forces produced aromatic plane structures in the molecular units of resin and asphaltene which were stronger than the selfpolymerized associated asphaltene due to intermolecular forces [23]. Hence, in the association of emulsified asphalt stability and contents of asphalt four components the sum of resin and asphaltene contents was associated with the stability of grey entropy.…”

Section: The Gray Entropy Correlation Between the Stability Of Emulsimentioning

confidence: 98%

The gray relation entropy research between the stability of emulsified asphalt and chemical components of asphalt

Zhao¹,

Gao²,

Zhang³

et al. 2018

Proceedings of the 2017 3rd International Forum on Energy, Environment Science and Materials (IFEESM 2017)

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“…Results obtained by other authors have previously shown that the solubility of asphaltenes was mainly related to either the aromaticity and aliphaticity factors or polarity of asphaltenes [15][16][17][18][19][20][21].…”

Section: Separation By Flocculationmentioning

confidence: 99%

Asphaltenes Size Polydispersity Reduction by Nano- and Ultrafiltration Separation Methods – Comparison with the Flocculation Method

Marques

Merdrignac

Baudot

et al. 2008

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Séparation des asphaltènes par nano et ultrafiltration -Comparaison avec la méthode de floculation -Les asphaltènes contiennent une multitude de composés très polydisperses en terme de composition chimique et en terme de taille, ce qui rend leurs propriétés et leur comportement difficiles à décrire. Afin de mieux caractériser ces espèces, une voie envisagée est de réduire cette polydispersité. Dans cette étude, nous avons proposé deux approches différentes : la floculation (en faisant appel à des solvants et anti-solvants) et la filtration membranaire. Les différentes fractions d'asphaltènes obtenues par chaque méthode sont caractérisées en utilisant les techniques suivantes : la chromatographie d'exclusion stérique (SEC), l'analyse élémentaire, la résonance magnétique nucléaire (RMN-13 C) et la diffusion des rayons X aux petits angles (SAXS). Il a été montré que des agrégats asphalténiques de différentes tailles peuvent être séparés par la filtration membranaire d'une façon plus sélective qu'en utilisant la méthode conventionnelle de floculation. Comparés aux grands agrégats, les petits agrégats asphalténiques présen-tent une aromaticité plus faible et un caractère aliphatique plus élevé. Leurs chaînes alkyles semblent être également plus courtes et plus ramifiées. De plus, l'analyse élémentaire indique que les plus petits asphaltènes contiennent une concentration inférieure en métaux et sont préférentiellement enrichis en vanadium plutôt qu'en nickel. Les effets de la température et de la concentration sur la performance de la séparation membranaire sont étudiés. Abstract

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Characterization of Polarity-Based Asphaltene Subfractions

Cited by 134 publications

References 24 publications

Effect of Chemical Composition on Asphaltenes Aggregation

Effect of Chemical Composition on Asphaltenes Aggregation

The gray relation entropy research between the stability of emulsified asphalt and chemical components of asphalt

Asphaltenes Size Polydispersity Reduction by Nano- and Ultrafiltration Separation Methods – Comparison with the Flocculation Method

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