Structure-Related Properties of Athabasca Asphaltenes and Resins as Indicated by Chromatographic Separation

Selucky, Milan L.; Kim, S. S.; Skinner, F. A.; Strausz, O. P.

doi:10.1021/ba-1981-0195.ch006

Cited by 22 publications

(24 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Column chromatography is an important method to study petroleum and its components, and it has been used to study petroleum asphaltenes for a long time. This work was initiated on chromatographic separations of asphaltenes in various chromatographic systems, adsorption on silica or clays [104,105], ion exchange [105,106], and gel-permeation chromatography (GPC) [107] to achieve the gradual separation of asphaltenes. The adsorption method is based on the difference in component polarity; with increasing polarity and power of the solvent, that of the eluted fraction increased, and gradient separation was achieved [26].…”

Section: Column Chromatographic Fractionationmentioning

confidence: 99%

Fractionation and Characterization of Petroleum Asphaltene: Focus on Metalopetroleomics

et al. 2020

View full text Add to dashboard Cite

Asphaltenes, as the heaviest and most polar fraction of petroleum, have been characterized by various analytical techniques. A variety of fractionation methods have been carried out to separate asphaltenes into multiple subfractions for further investigation, and some of them have important reference significance. The goal of the current review article is to offer insight into the multitudinous analytical techniques and fractionation methods of asphaltene analysis, following an introduction with regard to the morphologies of metals and heteroatoms in asphaltenes, as well their functions on asphaltene aggregation. Learned lessons and suggestions on possible future work conclude the present review article.

show abstract

Section: Column Chromatographic Fractionationmentioning

confidence: 99%

Fractionation and Characterization of Petroleum Asphaltene: Focus on Metalopetroleomics

et al. 2020

View full text Add to dashboard Cite

show abstract

“…There is no sudden transition in the molecular structural properties between resins and asphaltenes (Groenzin et al, 1999). Due to the complexity of the material and the interactions between high molecular weight molecules, the commonly used methods for fraction separation of asphalt cannot provide well-defined chemical fractions (Selucky et al, 1981). If part of the material is removed from the system during the separation, the molecular distribution and interaction are affected.…”

Section: Molecular Continuitymentioning

confidence: 99%

Glass Transition and Phase Stability in Asphalt Binders

Kříž

Stastna

Zanzotto

2008

Road Materials and Pavement Design

View full text Add to dashboard Cite

Major aspects of the glass transition of asphalt binders are described and an extensive literature review of the phenomenon and its relation to chemical composition is presented. The glass transition of asphalt binders was studied by modulated differential scanning calorimetry and also via dynamic mechanical analysis. A certain analogy between the glass transition of amorphous polymers and asphalts is suggested. The overall transition was found to be very broad on the temperature scale. The effects of evaporation of light-end components and oxidation on asphalt phase stability and glass transition were studied. It was suggested that phase incompatibility may exist in asphalts; however, the phase separation is observable after long-term isothermal conditioning at a temperature within the glass transition range. Based on the presented results, it is suggested that phase incompatibility develops if there is a discontinuity in the molecular distribution. Such discontinuity may be present in some neat binders as well as in severely oxidized or aged asphalt binders.

show abstract

“…Repeatedly, experimental results have shown that molecular-level understanding of asphaltenes is hindered by nanoaggregation. , Initial works on MW, by vapor pressure osmometry (VPO) and gel permeation chromatography (GPC), suggested that petroleum asphaltenes exhibited high masses in the range of ∼4 × 10 3 –1 × 10 5 g/mol. − Petroleum scientists soon realized that MW results, apart from being sample-dependent, varied based on the analytical technique(s) and analysis conditions (e.g., solvents, eluents, temperature). Thus, concerns about the innate, self-aggregation nature of asphaltenes and its impact on MW results ignited discussion about their plausible low MW.…”

Section: Introductionmentioning

confidence: 99%

Lessons Learned from a Decade-Long Assessment of Asphaltenes by Ultrahigh-Resolution Mass Spectrometry and Implications for Complex Mixture Analysis

et al. 2021

View full text Add to dashboard Cite

Recent advances in instrumentation for high-field Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) have enabled access to ∼70 000 unique molecular formulas in broadband mass spectral characterization of unfractionated/whole asphaltenes. The results accumulated over a decade highlight the need for an asphaltene molecular model that acknowledges the coexistence of (1) monofunctional and polyfunctional species; (2) island and archipelago structural motifs; and (3) heteroatom-depleted/highly aromatic compounds, as well as atypical species with low aromaticity but increased heteroatom content. Collectively, results from FT-ICR MS, preparatory-scale separations (extrography/interfacial material), gel permeation chromatography, precipitation behavior in heptane:toluene, thermal decomposition, and aggregate microstructure by atomic force microscopy (among other techniques), suggest that the strong aggregation of asphaltenes results from the synergy between several intermolecular forces: π-stacking, hydrogen bonding, London forces, and acid/base interactions. This review presents general features of asphaltene molecular composition reported over the past five decades. We focus on mass spectrometry characterization and expose the reasons why early results supported the dominance of single-core motifs. Then, the discussion shifts to recent advances in instrumentation for high-field FT-ICR MS, which have enabled the detection of thousands of species in asphaltene samples, whose molecular composition and fragmentation behavior in ultrahigh vacuum agree with the coexistence of single-core and multicore structural motifs. Furthermore, evidence that highlights the limitations of commercially available/custom-built ion sources and selective ionization effects is presented. Consequently, the limitations require separations (e.g., chromatography, extrography) to gain more-comprehensive molecular-level insights into the composition of these complex organic mixtures. The final sections present evidence for the role of aggregation in selective ionization and suggest that advanced characterization by both thermal desorption/decomposition and liquid chromatography with online FT-ICR MS detection can be employed to mitigate the effects of aggregation and provide unique insights in molecular composition/structure.

show abstract

Structure-Related Properties of Athabasca Asphaltenes and Resins as Indicated by Chromatographic Separation

Cited by 22 publications

References 0 publications

Fractionation and Characterization of Petroleum Asphaltene: Focus on Metalopetroleomics

Fractionation and Characterization of Petroleum Asphaltene: Focus on Metalopetroleomics

Glass Transition and Phase Stability in Asphalt Binders

Lessons Learned from a Decade-Long Assessment of Asphaltenes by Ultrahigh-Resolution Mass Spectrometry and Implications for Complex Mixture Analysis

Contact Info

Product

Resources

About