Analysis of asphaltenes by carbon and proton nuclear magnetic resonance spectroscopy

Dereppe, Jean-Marie; Moreaux, Claudette; Castex, H.

doi:10.1016/0016-2361(78)90061-3

Cited by 52 publications

(18 citation statements)

References 12 publications

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“…As regards the aromatic carbon distribution, the average aromatic cluster size (i.e., compactness of molecule) and the fractions of substituted and unsubstituted peripheral aromatic carbons are significant parameters which can be estimated. For the determination of the fraction of protonated aromatic carbon, some workers chose 129−130 ppm as the dividing point to distinguish quaternary and tertiary aromatic carbon atoms; ,, however, significant reduction in intensity of unresolved signals between 109 and 130 ppm at DEPT-45° and DEPT-90° spectra indicates the significant contribution of the quaternary aromatic carbon atoms in this region. The combined use of 1 H and 13 C NMR methods and overall hydrogen to carbon atomic ratio (H/C) determined by elemental analysis may provide a more accurate estimation for the fraction of protonated aromatic carbon with respect to the aromatic carbon amount (C arH , 0.304)…”

Section: Resultsmentioning

confidence: 99%

Structure and Reactivity of Petroleum-Derived Asphaltene

et al. 1999

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The structural characteristics of a pentane-insoluble asphaltene isolated from the vacuum residue of an Arabian crude mixture have been investigated by pyrolysis gas chromatography/ mass spectrometry (py/GC/MS), 1 H/ 13 C NMR, gel permeation chromatography (GPC), and matrixassisted laser desorption/ionization time-of-flight (MALDI TOF) mass spectrometry. Assignments of NMR signals of the asphaltene have been discussed briefly on the basis of the information from the literature and compared with those of an aliphatic fraction isolated from the ruthenium ion catalyzed oxidation products of the asphaltene. The comparison data indicated that aliphatic substitution 〉C 1 on aromatics are little; however, most of the chain methylene groups are located within a polymeric-saturated fraction of the asphaltene. The average size of aromatic fused ring systems has been determined to be 4-5 for the sample. Pyrolysis tests implied that the asphaltene sample is constructed with relatively large polycyclic units connected by relatively strong bonds. Our results also support a view that asphaltene is the mixture of complex polydispersed molecules with large variation of molecular sizes.

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Section: Resultsmentioning

confidence: 99%

Structure and Reactivity of Petroleum-Derived Asphaltene

et al. 1999

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“…C 1U is the percent unsubstituted aromatic carbon (8) and C 1 is the percent nonbridge aromatic carbon (9) In the I3C-NMR spectra of all investigated asphaltenes some prominent peaks are present due to long alkyl side-chains. The spectral assignment of these signals is the following: 105 2 -) and methyl group a to an aromatic ring.…”

Section: Nmr Spectroscopymentioning

confidence: 99%

Molecular Structure and Intermolecular Interaction of Asphaltenes by FT-IR, NMR, EPR

Scotti

Montanari

1998

Structures and Dynamics of Asphaltenes

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“…Several studies have been conducted at the IFP on the structure of asphaltenes by proton ( 1 H) and carbon ( 13 C) Nuclear Magnetic Resonance (NMR) (Bouquet et al, 1984;Dereppe et al, 1975). 13 C NMR can be used to characterise the CH 3 , CH 2 and CH molecular groups belonging to aliphatic chains and the CH, CH subsituted , C condensed molecular groups belonging to aromatic rings.…”

Section: Molecular Groupsmentioning

confidence: 99%

Characterisation of Asphaltenes and Modelling of Flocculation – State of the Art

Pina¹,

Mougin²,

Béhar³

2006

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Caractérisation des asphaltènes et modélisation de la floculation -État de l'Art -Ce travail présente un état de l'art concernant la floculation des asphaltènes avec deux grands items : la caractérisation des asphaltènes dans différents milieux et la modélisation de la floculation. Cette revue commence par une caractérisation des asphaltènes proprement dite puis des caractérisations de ces derniers dans des solvants synthétiques ou des bruts. Nous insistons sur les techniques de détermination de masses molaires et de diffraction. L'incidence d'un ajout de bon/mauvais solvant est également discutée. La seconde partie de cette revue concerne la modélisation de la floculation. Elle examine les différents modèles de la littérature avant de présenter celui de Szewczyk et Béhar (1999) et son intégration dans un simulateur de réservoir. Les modèles disponibles requièrent encore des données expérimentales délicates à acquérir et un effort de recherche doit être réalisé pour améliorer cet état de fait. Abstract -Characterisation of Asphaltenes and Modelling of Flocculation -State of the Art -This document describes a state of the art concerning the flocculation of asphaltenes with two major sections: characterisation of asphaltenes in various environments and modelling of flocculation. This review starts with the characterisation of asphaltenes as such, then their characterisation in synthetic solvents or crudes. Emphasis is placed on molar mass determination and diffraction techniques. The impact of adding a good/poor solvent is also discussed. The second part of this review is dedicated to modelling.We first examine the various models in the literature before describing the Szewczyk and Béhar (1999) model and its integration in a reservoir simulator. The models available still require experimental data which is difficult to collect and further research is needed to improve this situation.Petroleum Industry Applications of Thermodynamics Applications de la thermodynamique dans l'industrie pétrolière

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Analysis of asphaltenes by carbon and proton nuclear magnetic resonance spectroscopy

Cited by 52 publications

References 12 publications

Structure and Reactivity of Petroleum-Derived Asphaltene

Structure and Reactivity of Petroleum-Derived Asphaltene

Molecular Structure and Intermolecular Interaction of Asphaltenes by FT-IR, NMR, EPR

Characterisation of Asphaltenes and Modelling of Flocculation – State of the Art

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