Canadian Crudes: A Comparative Study of SARA Fractions from a Modified HPLC Separation Technique

Woods, John R.; Kung, J.; Kingston, David; Kotlyar, L.S.; Sparks, B.D.; McCracken, T.

doi:10.2516/ogst:2007080

Cited by 69 publications

(31 citation statements)

References 18 publications

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“…1 Oil fractions oxidation during routine isolation have been discussed before; 16,71 existence of oxidized forms in Athabasca asphaltenes has also been published based on XPS analysis. 72 The larger aggregation tendency for solvent extracted asphaltenes discussed in the preceding paragraphs, might in part derive from their extended oxidation occurring during additional exposition to air. Since most standard asphaltenes isolation methods 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 routinely practiced during many decades do not contemplate inert atmospheres, 6-13 the present results attempt to make a point in this regard.…”

Section: Preliminary Insights Into Chemical Functionalities Of Selectmentioning

confidence: 98%

Effect of Precipitating Conditions on Asphaltene Properties and Aggregation

et al. 2015

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Asphaltenes, resins and maltenes physical isolation procedures involving different alkane precipitants and solvent/sample ratios were applied in this work to Athabasca bitumen vacuum residue. Samples were characterized by Solubility Profiling, Size Exclusion Chromatography, Fluorescence Spectroscopy, X-ray Photoelectron Spectroscopy and density-viscosity analyses. Isolated fractions were found to display systematic property changes. Thus, it was found that denser, more polar, higher molecular weight (MW), more viscous, red shifted fluorescence materials were sequentially ranked as follows: Solvent extracted asphaltenes -C7 (unwashed) asphaltenes -C5 (unwashed) asphaltenes -resins -maltenes. Intermolecular aggregation for these fractions was determined to follow the same order. Decreasing contents of resins in the same order were found to increase aggregation phenomena.This work further reported on aspects of possible practical interest, i.e., the liquid nature of asphaltenes at 300°C and, possible existence of oxidative reactions affecting fractions isolation that follow standard methods which do not contemplate inert atmospheres. Preliminary assessment of chemical functionalities within isolated fractions highlighted on the possible enrichment of pyrrolic compounds within resins and oxygen functionalities in asphaltenes.

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Section: Preliminary Insights Into Chemical Functionalities Of Selectmentioning

confidence: 98%

Effect of Precipitating Conditions on Asphaltene Properties and Aggregation

et al. 2015

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“…For sulfur existing condition, J. Woods suggested that more thiophenic sulfur than thiols one by HPLC technique [30], so only At-S was selected from D&G model. R-benzo-thino-1s…”

Section: Establishment Of Molecular Modelsmentioning

confidence: 99%

Investigating the Interactions of the Saturate, Aromatic, Resin, and Asphaltene Four Fractions in Asphalt Binders by Molecular Simulations

et al. 2015

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Molecular dynamics provides a powerful tool to understand the elusive structure–performance relationship of asphalts. The combined molecular models were selected to investigate the interactions of the saturate, aromatic, resin, and asphaltene (SARA) four fractions and the correlation between fractions and the “bee-like structures” by atomic force microscopy in asphalts. The results showed that van der Waals was the main force to control intermolecular interactions. The arrangement of SARA fractions largely conformed to the modern colloid theory. However, some alkanes, sulfides, and condensed aromatics had different behaviors. Long-chain alkanes inserted into layers of asphaltenes, and small sulfides without long alkyl chains adhered to large sulfides or asphaltenes; nevertheless, counterpart condensed aromatics became much closer to those molecules. Strong interactions between the dispersed phase and continuous phase generated a larger size and greater number of “bee structures”. Asphaltenes played as a core, and long-chain paraffin played as an inducer, to affect the distribution of “bee structures”.

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“…The hydrocarbons that contain heteroatoms could vary from very simple one such as thiophene to very complex mixtures such as asphaltenes for which the structure is not well understood, but known to contain sulfur, oxygen and nitrogen at different levels, in addition to carbon and hydrogen (Buenrostro-Gonzalez et al, 2002;Woods et al, 2008).…”

Section: Non-hydrocarbonsmentioning

confidence: 99%