Probing Flocculant-Induced Asphaltene Precipitation via NMR Imaging: from Model Toluene-Asphaltene Systems to Natural Crude Oils

Morozov, Evgeny V.; Martyanov, Oleg N.

doi:10.1007/s00723-015-0741-9

Cited by 18 publications

(25 citation statements)

References 41 publications

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“…NMR methods [23,24] have proven to be extremely useful for defining the average molecular parameters of asphaltene fractions. Through the application of 1H-NMR [89][90][91], 13C-NMR [89,[92][93][94], distorsionless enhancement by polarization transfer (DEPT) [95,96], solid-state (SS) NMR [94,97,98], and magnetic resonance imaging (MRI) [99][100][101], the hydrocarbon skeleton could be described in much detail. Although the chemical structure of asphaltene samples depends on geographical origin and even wells in the same crude oil production region, the deduced picture of asphaltenes from these studies is that of aromatic polycyclic clusters variably substituted with alkyl chains that may be quite long (up to C 10 -C 12 ), and connected by alkyl and heteroatom bridges.…”

Section: Sequential Extractionmentioning

confidence: 99%

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 Extractionmentioning

confidence: 99%

Fractionation and Characterization of Petroleum Asphaltene: Focus on Metalopetroleomics

et al. 2020

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“…We have so far addressed the application of solution and solid-state high- and low-field NMR on the characterization of asphaltenes chemical and molecular structure, interactions, morphology of association and aggregation. Magnetic resonance imaging (MRI) has also been applied, ,, albeit a few to study asphaltenes for understanding the process of association, aggregation, and precipitation in bulk. This technique has been widely employed to many areas of research and development , because of its nondestructive visualization of various processes occurring in optically opaque systems.…”

Section: Application Of Nmr Spectrocopy On Asphaltenesmentioning

confidence: 99%

“…T 2 maps of n -heptane/toluene-asphaltenes blends (flocculant to sample volume ratio of 2:1) at different times after stirring (Reprinted with permission from ref . Copyright 2016 American Chemical Society).…”

Section: Application Of Nmr Spectrocopy On Asphaltenesmentioning

confidence: 99%

NMR Spectroscopy Analysis of Asphaltenes

Mal

2019

Energy Fuels

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In crude oil production and processing, asphaltene aggregation followed by precipitation is a major problem for the oil industry as it causes deactivation of catalysts, blocking pipelines, and deposition on the internal surface of the reservoirs, etc. Asphaltenes, a complex mixture of a broad distribution of molecules, consisting of aromatic cores bonded to aliphatics and porphyrin type molecules with heavy metals, are defined based on solubility. Molecular complexity along with varying molecular weight distribution makes asphaltenes a difficult scientific problem to characterize. Over several decades, many researchers have contributed to characterization, analysis, and determination of structural properties of asphaltenes by various analytical techniques. Nuclear magnetic resonance (NMR) spectroscopy and relaxometry are widely applied for characterizing the chemical structures of asphaltenes, interactions between asphaltenes and maltenes, and dynamical behaviors of asphaltenes in bulk and in confined states. The goal of the current review article is to give an insight into various aspects of asphaltene analysis by NMR spectroscopy and relaxometry. Following a short introduction on asphaltenes and theory of NMR technique, recent contributions on asphaltenes by NMR techniques are summarized and presented. Lessons learned and suggestions on possible future work conclude the present review article.

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“…MRI provides spatial resolution of 10 μm, which allows the study of the systems at the micrometer level to obtain unique in situ data on the phase stability and physico-chemical processes in real oil samples under different external conditions at different space and time scales. MRI has been used in the studies of aggregation [24], precipitation [25], and segregation [26] of asphaltenes; formation of gas voids [27] and multilayer deposits of paraffin [24] in paraffinrich oil; rheology of heavy oils and model systems [26]; reversibility of certain processes involving asphaltenes depending on their local environment [24].…”

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confidence: 99%

Chemical Heterogeneity of Deposits Formed in the Flocculant Flow From Crude Oil, According to FTIR Microscopy and Chemical Imaging

et al. 2021

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Asphaltene-containing deposits formed on the CaF2 window induced by n-heptane flow in a microfluidic device have been investigated using an IR microscope and an imaging macro chamber (IMAC) with FPA detection. This is the first example of the ex situ infrared imaging of the deposits from crude oil formed under dynamic conditions of flocculant flow. It has been shown that fast aggregation of asphaltenes in n-heptane flow leads to the formation of deposit rich in heteroatom-containing functional groups: (О–Н, N–H, C=O, C–O, and S=O).

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Probing Flocculant-Induced Asphaltene Precipitation via NMR Imaging: from Model Toluene-Asphaltene Systems to Natural Crude Oils

Cited by 18 publications

References 41 publications

Fractionation and Characterization of Petroleum Asphaltene: Focus on Metalopetroleomics

Fractionation and Characterization of Petroleum Asphaltene: Focus on Metalopetroleomics

NMR Spectroscopy Analysis of Asphaltenes

Chemical Heterogeneity of Deposits Formed in the Flocculant Flow From Crude Oil, According to FTIR Microscopy and Chemical Imaging

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