Equivalent Distillation: A Path to a Better Understanding of Asphaltene Characteristics and Behavior

Rogel, Estrella; Roye, Michael; Vien, Janie; Witt, Matthias

doi:10.1021/bk-2018-1282.ch003

Cited by 5 publications

(5 citation statements)

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“…This method is sequential elution fractionation (SEF), and it involves the precipitation and dissolution of components in an inert column. Using this method, they demonstrated that nondistillable fractions followed the same patterns as those of distillation cuts, and that solubility could be used to perform equivalent distillation for nondistillable materials [71]. The SEF technique is based on the principle of increasing the power of the used solvent to dissolve the sample.…”

Section: Sequential Elution Fractionation (Sef)mentioning

confidence: 99%

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Fractionation and Characterization of Petroleum Asphaltene: Focus on Metalopetroleomics

et al. 2020

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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.

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Section: Sequential Elution Fractionation (Sef)mentioning

confidence: 99%

“…Generally, the SEF method requires petroleum or asphaltenes to first be loaded on the carrier and then eluted with different solvents. Here, the method of Rogel et al [71] is taken as an example. A sample was deposited on 60 mesh nonporous polytetrafluoroethylene (PTFE) particles.…”

Section: Sequential Elution Fractionation (Sef)mentioning

confidence: 99%

Fractionation and Characterization of Petroleum Asphaltene: Focus on Metalopetroleomics

et al. 2020

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“…These results indicate that the formation of stacked structures is driven mainly by the aromatic moieties present in asphaltenes and that these interactions persist even at considerably high temperatures. , For polyaromatic compounds, it has been shown that an increase in the surface area of the molecule leads to a more pronounced stacking tendency and reduces solubility. , Similarly, it has been shown that the incorporation of aliphatic chains in large polyaromatic molecules increases their solubility. , The increase in solubility depends on the number and volume of the chains. , Also, different chain size and chain number induce different aggregation modes. , These results with analogue polyaromatic molecules agree with experimental data gathered for asphaltene fractions. Separation of asphaltenes in solubility fractions has shown that as the fractions become less soluble in hydrocarbons, their H/C molar ratios decrease and aromaticities increase. − It has been reported that the solubility in toluene of some separated asphaltene fractions is around 1000 times lower than the solubility of the whole asphaltenes . These results, as well as other studies, , point to the presence of molecules with very low solubility in the crude oil.…”

Section: Introductionmentioning

confidence: 76%

“…Separation of asphaltenes in solubility fractions has shown that as the fractions become less soluble in hydrocarbons, their H/C molar ratios decrease and aromaticities increase. − It has been reported that the solubility in toluene of some separated asphaltene fractions is around 1000 times lower than the solubility of the whole asphaltenes . These results, as well as other studies, , point to the presence of molecules with very low solubility in the crude oil. It also indicates that the absence of molecules to act as a material of intermediate solubility between these low solubility asphaltenes and the dispersion medium can induce asphaltene precipitation …”

Section: Introductionmentioning

confidence: 76%

Asphaltene and Maltene Adsorption into Graphene

et al. 2019

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In this work, the mechanism by which insoluble asphaltenes represented by small graphene fragments interact with different components of crude oils is explored. Adsorption isotherms of maltenes and asphaltenes into graphene from toluene were determined by the depletion method. The results indicate that the adsorption of these heavy fractions occurs in two steps: after the initial adsorption, a plateau is reached that seems to follow a Langmuir type adsorption isotherm. In the second step, at higher concentrations, the adsorbed amount starts to increase sharply after an inflection point indicating strong interactions between the adsorbates. A multilayer adsorption model was successful in describing this adsorption behavior. Dispersion of graphene in the solution was observed for some of the samples in the concentration range studied. It was found that asphaltenes can disperse graphene at lower concentrations than maltenes. From the same crude oil, it was observed that heptane-extracted asphaltenes disperse graphene at lower concentrations than the pentane-extracted ones. Mass spectrometry analysis of the species of molecules left in the solution after adsorption shows the preferential adsorption of highly aromatic molecules, high molecular weight molecules, and molecules containing several heteroatoms. A reduction of 92% on the relative abundance of porphyrins points to a great affinity of these species to graphene. These results indicate that graphene-like molecules in hydrocarbons cannot remain in solution unless they are dispersed by other components. Therefore, the existence of a critical nanoaggregate concentration for these crude oil components is unlikely.

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“…While the formation of aggregates poses a problem for determining molecular weights, it is also an opportunity to evaluate aggregation behavior. In fact, from its inception, SEC has provided important insights into the characteristics and interactions of heavy fractions and asphaltenes, distribution of aggregate sizes of asphaltene fractions, , preferential adsorption of asphaltenes on metal surfaces, and metal distribution on asphaltenes ,− among others. These results show that SEC can be a powerful tool for the analysis and better understanding of asphaltene behavior.…”

Section: Introductionmentioning

confidence: 99%

Evaluating Asphaltenes by Size Exclusion Chromatography

Rogel,

Dutta

2023

Energy Fuels

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Size exclusion chromatography (SEC) has been used extensively to characterize asphaltenes, crude oils, and petroleum products. These studies have provided significant insights into the nature and behavior of this material. This work presents a couple of new applications that use this technique. First, a new methodology is presented for determining the asphaltene content based on using a SEC column. This new method shows good repeatability, and the results correlate with the gravimetric standard method ASTM D6560. Second, we explored the SEC behavior of a series of different asphaltenes injected at low concentrations (10−500 ppm) using an evaporative light scattering detector. The analysis of the changes in relative areas of the peaks in the chromatogram revealed a break in the behavior between 50 and 100 ppm which could have been associated with the existence of a critical nanoaggregate concentration (CNAC). However, based on the presence of significant peaks (∼30−40% of the total area) corresponding to asphaltene aggregates even at concentrations as low as 10 ppm, this break cannot correspond to a CNAC, instead it might be associated with a transition to a different aggregation mechanism. This work also explores the SEC behavior of asphaltenes precipitated using different solvents from the same crude oil and shows how the aggregation is correlated to the solvent used to obtain the asphaltenes, while the aggregate sizes are related to the average characteristics of the molecules that precipitate using each solvent.

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Equivalent Distillation: A Path to a Better Understanding of Asphaltene Characteristics and Behavior

Cited by 5 publications

References 58 publications

Fractionation and Characterization of Petroleum Asphaltene: Focus on Metalopetroleomics

Fractionation and Characterization of Petroleum Asphaltene: Focus on Metalopetroleomics

Asphaltene and Maltene Adsorption into Graphene

Evaluating Asphaltenes by Size Exclusion Chromatography

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