Digging Into Asphaltenes

Arnaud, Celia

doi:10.1021/cen-v087n038.p012

Cited by 15 publications

(20 citation statements)

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“…According to [8], for a given volume of precipitant, the amount of the heavy organic precipitate decreases as the carbon number of n-alkane precipitants increases. According to [22],the molecular weight distribution of nC 5 ,nC 7 and nC 9 are different since solubility properties of the precipitated asphaltenes vary according to the solvent used for their precipitation. The resin content in the precipitates increases as the number of carbons in the precipitating solvent decreases.…”

Section: Resultsmentioning

confidence: 99%

“…It shows that the compositional differential analysis of nC 5 :nC 7 will be quite large and different compared to nC 5 :nC 6 and nC 6 :nC 7 depending on their method of precipitation. It equally gives an ideal why the maxima were observed at 1:1 ratios of the different binary mixtures.…”

Section: Discussionmentioning

confidence: 99%

“…Boiling increases from hexane to cyclohexane, benzene to pyridine and to aromatic amine. High boiling doesn't show heavy molecules but big aromaticity relative to the other species in crude oil [5,3]. It has been reported that three transition (phases) stages was observed using both single and binary mixture of n-alkanes which shows a decrease in quantity of the precipitate as the carbon number of nalkanes solvents increases [8] but failed to mention that phase envelope can be used in their relationship.…”

Section: Comparison Of the Phase Changes Of Binary Mixtures N-alkanesmentioning

confidence: 99%

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Comparison of the Phase Changes of Binary Mixtures n-Alkanes of Lower Carbon Numbers

Utin¹,

Ofodile²,

Osuji³

et al. 2016

IOSR

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Comparison Of the Phase Changes Of Binary Mixtures N-alkanesmentioning

confidence: 99%

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Comparison of the Phase Changes of Binary Mixtures n-Alkanes of Lower Carbon Numbers

Utin¹,

Ofodile²,

Osuji³

et al. 2016

IOSR

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“…The formation and deposition of asphaltene-rich, solidlike material during oil recovery operations have been well documented in the literature (7,9,17). Asphaltenes are often considered troublemakers because of their tendency to flocculation (2).…”

Section: Introductionmentioning

confidence: 99%

An Investigation into the Precipitation of Asphaltene from Maltenes Using Binary Mixtures of N-Paraffin

2017

International Journal of Petroleum and Petrochemical Engineerin

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“…With its ability to provide molecular formulas through ultrahigh resolution, Fourier-transform ion cyclotron resonance mass spectrometry (FTICR-MS) has contributed significant information on the total numbers of individual structures, carbon number and molecular weight ranges, and heteroatom compound classes in asphaltenes [ 3 , 19 – 21 ]. Asphaltenes may contain up to 10,000 individual structures, compared to the largest number of total structures reported for a whole crude oil thusfar of approximately 85,000 [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

Probing the Carbonyl Functionality of a Petroleum Resin and Asphaltene through Oximation and Schiff Base Formation in Conjunction with N-15 NMR

Thorn

Cox

2015

PLoS ONE

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Despite recent advances in spectroscopic techniques, there is uncertainty regarding the nature of the carbonyl groups in the asphaltene and resin fractions of crude oil, information necessary for an understanding of the physical properties and environmental fate of these materials. Carbonyl and hydroxyl group functionalities are not observed in natural abundance 13C nuclear magnetic resonance (NMR) spectra of asphaltenes and resins and therefore require spin labeling techniques for detection. In this study, the carbonyl functionalities of the resin and asphaltene fractions from a light aliphatic crude oil that is the source of groundwater contamination at the long term USGS study site near Bemidji, Minnesota, have been examined through reaction with 15N-labeled hydroxylamine and aniline in conjunction with analysis by solid and liquid state 15N NMR. Ketone groups were revealed through 15N NMR detection of their oxime and Schiff base derivatives, and esters through their hydroxamic acid derivatives. Anilinohydroquinone adducts provided evidence for quinones. Some possible configurations of the ketone groups in the resin and asphaltene fractions can be inferred from a consideration of the likely reactions that lead to heterocyclic condensation products with aniline and to the Beckmann reaction products from the initially formed oximes. These include aromatic ketones and ketones adjacent to quaternary carbon centers, β-hydroxyketones, β-diketones, and β-ketoesters. In a solid state cross polarization/magic angle spinning (CP/MAS) 15N NMR spectrum recorded on the underivatized asphaltene as a control, carbazole and pyrrole-like nitrogens were the major naturally abundant nitrogens detected.

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Digging Into Asphaltenes

Cited by 15 publications

References 0 publications

Comparison of the Phase Changes of Binary Mixtures n-Alkanes of Lower Carbon Numbers

Comparison of the Phase Changes of Binary Mixtures n-Alkanes of Lower Carbon Numbers

An Investigation into the Precipitation of Asphaltene from Maltenes Using Binary Mixtures of N-Paraffin

Probing the Carbonyl Functionality of a Petroleum Resin and Asphaltene through Oximation and Schiff Base Formation in Conjunction with N-15 NMR

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