Asphaltene induced changes in rheological properties: A review

Moud, Aref Abbasi

doi:10.1016/j.fuel.2022.123372

Cited by 52 publications

(24 citation statements)

References 200 publications

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“…In the case of petroleum asphaltenes, their solubility properties impact many aspects of reservoir evaluation, production, transportation, refining, and paving and coatings. ,,, Petroleum asphaltenes’ interfacial activity with rocks affects wettability , with potential applications in enhanced oil recovery. Reservoir fluid geodynamics and reservoir evaluation use new asphaltene thermodynamics to evaluate fluid equilibrium and connectivity. ,, Furthermore, understanding the chemical processes that occur in oil reservoirs is enhanced by asphaltenes’ precise structural characterization. ,,, …”

Section: Introductionmentioning

confidence: 99%

Application of the Y-Rule and Theoretical Study to Understand the Topological and Electronic Structures of Polycyclic Aromatic Hydrocarbons from Atomic Force Microscopy Images of Soot, Coal Asphaltenes, and Petroleum Asphaltenes

Ruiz‐Morales

2022

Energy Fuels

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The molecular structures of polycyclic aromatic hydrocarbons (PAHs) from different sources (coal-derived asphaltenes (CA), petroleum-derived asphaltenes (PA) and soot (S)), that were obtained from noncontact atomic force microscopy (nc-AFM) studies published in the literature, are systematically analyzed to understand the electronic and topological structures of PAHs from different sources. The topological characterization is accomplished by obtaining the distributions of the number of fused aromatic rings (nFAR), the type and abundance of aromatic pentagonal rings, and the degree of pericondensation. Electronic characterization is carried out by obtaining the π-electron distribution in resonant sextets and localized double bonds in Clar structures using the Y-rule, and by calculating the HOMO− LUMO gap (optical transition) by means of the ZINDO/S approximation. In addition, the carbon ratio (the ratio of carbon atoms in isolated double bonds (IDB) and in aromatic sextet rings, C R = IDB/sextet carbon) is analyzed for all the structures to conclude the stability and reactivity. It is found that the PAHs from petroleum asphaltenes contain between four fused aromatic rings (4FAR) and 10FAR, with a prevalence of 6FAR−7FAR. PAHs from coal asphaltenes present structures in the range of 4FAR−11FAR, with abundant structures with 7FAR−8FAR. PAHs from soot present structures in the range of 6FAR−11FAR with a major abundance of 8FAR and 9FAR. In general, S, CA, and PA structures present one single PAH per molecule; however, a fraction of the structures in the CA and PA groups possess a single conjugated aryl-linked aromatic core, in the order CA > PA. Pentagonal rings re present in S, CA, and PA PAHs; nevertheless, these are more predominant in the soot PAHs, and the most abundant is the acenaphthylene-type pentagonal ring. For the more abundant FAR families in PAHs from S, CA, and PA, the number of Y-carbons (triple bridgehead aromatic carbons) are 7 and 8 for PAHs from soot, and PAHs from coal asphaltenes present six Y-carbons as the most abundant. These numbers are a measure of high pericondensation, which is higher in soot PAHs than in PAHs from coal asphaltenes. The PA PAHs tend to be more extended, which is reflected in low values of Y-carbons. The carbon ratios for the PAHs from S, CA, and PA show an intermediate stability and intermediate reactivity. The most abundant FAR families for PAHs in soot, coal asphaltenes, and petroleum asphaltenes present a molecular weight of 300−700 g/mol and a HOMO−LUMO gap in the range of 400−550 nm.

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Section: Introductionmentioning

confidence: 99%

Application of the Y-Rule and Theoretical Study to Understand the Topological and Electronic Structures of Polycyclic Aromatic Hydrocarbons from Atomic Force Microscopy Images of Soot, Coal Asphaltenes, and Petroleum Asphaltenes

Ruiz‐Morales

2022

Energy Fuels

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“…As explain earlier one way to neutralize this is to use demulsifiers [114][115] that can turn droplet interface from viscoelastic to viscose again. Demuslfication include variety of methods that has been enumerated in our previous publication 22 .…”

Section: Emulsificationmentioning

confidence: 99%

“…Another problem that petroleum business faces; is asphaltene precipitation and aggregation that during process of extraction of oil or moving it into refineries causes various flow issues. To investigate aggregation and precipitation; state of the art characterization tools have been employed including using simulations, model compounds (synthetic and refined ones) and microfluidics among others [22][23][24] . The asphaltene in the oil products will continue to be stable under equilibrium circumstances.…”

Section: Introductionmentioning

confidence: 99%

Asphaltene Modeling, Emulsion, and Aggregation: A Review

Moud¹

2022

Preprint

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Asphaltene is a component of crude oil that, if mishandled, may create substantial transportation and industrial concerns. It is a solid by nature, with a diverse set of molecular compositions. Furthermore, the oil industry has identified emulsion generation and clogging precipitate as key concerns. The emulsified water droplets in the process are just what give the raw oil its increased viscosity; hence, power is squandered to transport the oil around. The information has been separated into sections based on simulation, solubilization, agglomeration, precipitation, and evidence of model chemicals in the literature. We have included research that investigates the bulk rheology and interfacial rheology of asphaltene to describe its interfacial activity more clearly.

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“…The first images of asphaltene molecules were obtained by combining atomic-resolution imaging using atomic force microscopy and molecular orbital imaging using scanning tunneling microscopy . Probing the structure of over 100 species revealed a large molecular polydispersity with a dominant island architecture. − A typical structure consisted of a polycyclic aromatic hydrocarbon (PAH) core and peripheral alkyl chains. − A significant width of the distribution of ring sizes and chain lengths may exist depending on the origin of the asphaltenes, the processing methods they are subjected to, and the solvent used to extract them. Coal asphaltenes, for example, contain smaller polycyclic aromatic cores and much fewer alkane substitutions than petroleum asphaltenes .…”

Section: Introductionmentioning

confidence: 99%

New Insights into Asphaltene Structure and Aggregation by High-Resolution Microscopy

2022

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Transmission electron microscopy was used to probe the structural properties of asphaltenes and their aggregation behavior. Asphaltenes precipitated by different n-alkanes (n-C5, n-C7, and n-C10) were considered in addition to the interfacial material (IM) extracted from n-C7 asphaltenes. Measurements were first performed with powdered samples dispersed in methanol. Analysis of the amorphous layers observed in their segmented micrographs provided important structural parameters such as the edge-to-edge spacing between particles, the average area and shape factor of these particles, and the rugosity of the layer’s boundary. Short-range order was observed in all samples due to the parallel stacking propensity of asphaltenes. Denser packing and lower particle circularity of the higher alkane asphaltenes resulted in the smallest interparticle spacing. On the other hand, disruption of stacking by the aliphatic side chains was more prevalent in the lower alkane asphaltenes as molecular polydispersity increased. The lower shape factor and average area of the n-C7 IM indicated the presence of smaller particles than in the parent asphaltenes. Furthermore, the much smaller edge-to-edge and interlayer spacings suggested much tighter molecular packing due to the π–π stacking of the small aromatic cores and hydrogen bonding between the fatty acid chains. The higher crystallinity of the IM yielded thin nanosheets that were previously observed in liquid samples. Structure–function relations were also established by comparing micrographs of solid n-C10 asphaltenes to those dispersed in heptol solutions. Crystalline structures seen in the solid samples appeared as small globular clusters in the liquid samples. Their shape and average size were consistent with the Yen–Mullins model.

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Asphaltene induced changes in rheological properties: A review

Cited by 52 publications

References 200 publications

Application of the Y-Rule and Theoretical Study to Understand the Topological and Electronic Structures of Polycyclic Aromatic Hydrocarbons from Atomic Force Microscopy Images of Soot, Coal Asphaltenes, and Petroleum Asphaltenes

Application of the Y-Rule and Theoretical Study to Understand the Topological and Electronic Structures of Polycyclic Aromatic Hydrocarbons from Atomic Force Microscopy Images of Soot, Coal Asphaltenes, and Petroleum Asphaltenes

Asphaltene Modeling, Emulsion, and Aggregation: A Review

New Insights into Asphaltene Structure and Aggregation by High-Resolution Microscopy

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