NMR Analysis of Asphaltenes Separated from Vacuum Residues by Selected Solvents

Seidl, Peter Rudolf; Chrisman, Erika Christina Ashton Nunes; Carvalho, Cristine Clemente; Leal, Kátia Zaccur; Menezes, Sônia Maria Cabral de

doi:10.1081/dis-120037689

Cited by 17 publications

(16 citation statements)

References 10 publications

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“…Many instrumental analytical techniques were used to investigate asphaltene composition, structure and aggregation properties, such as X-ray diffraction (XRD), [2][3][4] mass spectrometry (MS), [5][6][7][8][9] gas chromatography (GC), [10] fluorescence depolarization (FD), [11] scanning electron microscopy (SEM), [12,13] transmission electron microscopy (TEM), [12] Fourier-transform infrared spectroscopy (FTIR), [14,15] vapor pressure osmometry (VPO), [16] smallangle X-ray scattering (SAXS), [17,18] small-angle neutron scattering (SANS), [19][20][21] nuclear magnetic resonance (NMR) [22][23][24][25] A spectroscopy and others. Despite of all efforts made to understand asphaltene behavior and structural architecture, there are many details still to be resolved.…”

Section: Methods For Asphaltene Analysismentioning

confidence: 99%

“…It has widely been used to study petroleum and asphaltene chemistry for more than 60 years. [22][23][24][25][32][33][34] Molina et al demonstrated that the asphaltene samples isolated from various crude oils at the Colorado oil field had considerably different molecular structures, despite the same geological formation. In that study, asphaltene samples were characterized by 1 H and 13 C NMR spectroscopy.…”

Section: One-dimensional Techniquesmentioning

confidence: 99%

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NMR Spectroscopy as a Tool for Studying Asphaltene Composition

Vuković¹,

Novak

Jednačak

2019

Croat. chem. acta (Online)

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Asphaltenes are the most polar oil components with molecular weights between 500 and 1000 Da, which primarily consist of carbons and hydrogens, some heteroatoms, such as nitrogen, sulphur, oxygen and traces of nickel, vanadium and iron. Owing to their extreme complexity, it is almost impossible to completely identify all the compounds present in asphaltene samples. Various analytical techniques and approaches were used to characterize asphaltenes but their structure and composition are still a matter of thorough investigations. NMR spectroscopy can reveal useful information on asphaltene molecular architecture and aggregation process. In that respect, one- and two-dimensional NMR techniques have widely been employed. Although NMR spectra of these complex mixtures are difficult to interpret, they still can provide valuable data, especially in combination with statistical methods. Some distinctive examples of using NMR spectroscopy to study asphaltenes are given in this review.

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Section: Methods For Asphaltene Analysismentioning

confidence: 99%

Section: One-dimensional Techniquesmentioning

confidence: 99%

NMR Spectroscopy as a Tool for Studying Asphaltene Composition

Vuković¹,

Novak

Jednačak

2019

Croat. chem. acta (Online)

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“…Be that as it may, these nanostructures, representing only a small part of the entire amount of ASPs, may still be stable, and as stated by previous studies [119,124], they would not be increased by association with other molecules around them. In addition, the alkyl substituents present in the aromatic rings of ASP molecules might cause a steric inhibition for stacking [125]. As a matter of fact, steric effects could hinder the growth of aggregates and influence their size, although for those inhibited molecules, other forces may preside over these, and a different mechanism of association would occur.…”

Section: Critical Micelle Critical Nanoaggregation and Critical Clust...mentioning

confidence: 99%

The Structure of Bitumen: Conceptual Models and Experimental Evidences

et al. 2022

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Bitumen, one of the by-products of petroleum industry processes, is the most common binder used in road pavements and in the construction industry in general. It is a complex organic mixture of a broad range of hydrocarbons classified into four chemical families, collectively known with the acronym SARA fractions, which include saturates, aromatics, resins and asphaltenes. Since the 1940s, researchers working on bitumen and the science behind its existence, nature and application have investigated the spatial organization and arrangement of several molecular species present in the binder. Therefore, several models have been proposed in the literature, and they are more or less corroborated by experimental studies, although most of them are model-dependent; for example, the structural investigations based on scattering techniques. One of the most popular models that has met with a wide consensus (both experimentally and of the modeling/computational type) is the one aiming at the colloidal description of bitumen’s microstructure. Other types of models have appeared in the literature that propose alternative views to the colloidal scheme, equally valid and capable of providing results that comply with experimental and theoretical evidence. Spurred by the constant advancement of research in the field of bitumen science, this literature review is aimed at providing a thorough, continuous and adept state of knowledge on the modeling efforts herein elaborated, in order to more precisely describe the intricacy of the bituminous microstructure. In this body of work, experimental evidence, along with details of bitumen’s microstructure (depicting the colloidal state of bitumen), is particularly emphasized. We will also try to shed light on the evolution of the experimental and theoretical results that have focused on the aspect of the association and aggregation properties of asphaltenes in various models and real systems.

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“…Fractionation of asphaltenes obtained from vacuum residues using ethyl acetate, acetone, methyl isobutyl ketone, acetyl acetone, and carbon tetrachloride as single solvents and the extracts were analyzed by different analytical techniques [26]. NMR provides both statistical and structural information on the carbon skeleton, qualitative and quantitative distribution of carbon and hydrogen atoms present in different chemical environments of petroleum matrix.…”

Section: Introductionmentioning

confidence: 99%

Catalytic pyrolysis of Arab Heavy residue and effects on the chemistry of asphaltene

Siddiqui

2010

Journal of Analytical and Applied Pyrolysis

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NMR Analysis of Asphaltenes Separated from Vacuum Residues by Selected Solvents

Cited by 17 publications

References 10 publications

NMR Spectroscopy as a Tool for Studying Asphaltene Composition

NMR Spectroscopy as a Tool for Studying Asphaltene Composition

The Structure of Bitumen: Conceptual Models and Experimental Evidences

Catalytic pyrolysis of Arab Heavy residue and effects on the chemistry of asphaltene

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