A Comparative study of the chemical structure of asphaltenes from Algerian petroleum collected at different stages of extraction and processing

Daaou, Mortada; Larbi, Asma; Martínez–Haya, Bruno; Rogalski, Marek

doi:10.1016/j.petrol.2015.11.040

Cited by 23 publications

(16 citation statements)

References 54 publications

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“…Unfortunately, we could not perform direct analysis of the oxygen content of our samples with the techniques at hand; the values in Table are inferred from mass balance. While such a high oxygen content may seem unusual, similar values, ranging within 10%–14%, have been reported in previous analyses of downstream deposits of crude oil from different wells within the Hassi–Messaoud fields. , The stage of processing or aging mechanism responsible for the oxygenation of the crude oil is under discussion with the engineers of the Sonatrach Company and will be the topic of future research.…”

Section: Resultsmentioning

confidence: 99%

Molecular Characterization of Nonvolatile Fractions of Algerian Petroleum with High-Resolution Mass Spectrometry

et al. 2021

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Algerian crude oil displays a marked propensity for asphaltene precipitation, leading to solid deposits during extraction, transportation, and storage. The relationship between precipitation and chemical composition is unclear; in fact, Algerian crude oil actually features a low asphaltene concentration, despite its relatively large rate of deposit formation. The rationalization of the precipitation process and its remediation should benefit from a molecular characterization of the crude oil. In this study, two unstable asphaltene fractions (A1 and A2) from two different deposits, and two resin crude oil fractions (R1 and R2) from the Hassi-Messaoud Algerian field have been characterized at the molecular level by means of high-resolution mass spectrometry with an Atmospheric Pressure Chemical Ionization (APCI) source. Positively and negatively charged compounds with molecular weights 200−1200 m/z were detected. Several thousand molecular stoichiometries were identified and classified for each sample, in terms of heteroatom content and aromaticity, searching for trends characteristic of the two asphaltenes and of the associated resins. The A2 asphaltene, from a downstream storage tank, displays a higher aromaticity and O-heteroatom content, which correlates with an enhanced aggregation propensity, in comparison to the A1 fraction, collected at the well bore. The resin fractions are found to be abundant in aliphatic hydrocarbons and heteroatomic compounds of moderate aromaticity. The more polar resin fraction, R2, is enriched in N-containing species, with respect to the less polar resin fraction R1, which correlates with the stabilizing function observed in previous works. The results stress the view of crude oil fractions as complex mixtures, rather than in terms of average prototypical compounds, when facing the understanding of asphaltene deposition conditions.

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Section: Resultsmentioning

confidence: 99%

Molecular Characterization of Nonvolatile Fractions of Algerian Petroleum with High-Resolution Mass Spectrometry

et al. 2021

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“…From the 1 H NMR analysis, AMPs, such as the aromaticity factors of hydrogen ( f a ), length of alkyl chains ( n ), and number of substituted rings ( r ), , were obtained via …”

Section: Resultsmentioning

confidence: 99%

“…From the 1 H NMR analysis, AMPs, such as the aromaticity factors of hydrogen (f a ), length of alkyl chains (n), and number of substituted rings (r), 58,59 were obtained via Figure 7 shows the distribution of the AMP's for a set of vacuum residues. The tendency of the results shows that the vacuum residues have significant differences in its aromatic structure and alkyl chains.…”

Section: Resultsmentioning

confidence: 99%

Reactivity of Vacuum Residues by Thermogravimetric Analysis and Nuclear Magnetic Resonance Spectroscopy

León

Picón

et al. 2020

Energy Fuels

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In this work, the thermal cracking process of seventeen (17) vacuum residues from Colombian crude oils is studied. Cracking tests are carried out in a batch microreactor at 390, 410, 420, and 430 °C, during 60 min of reaction and in an inert atmosphere with nitrogen. The quality of the vacuum residues and its products, obtained under thermal cracking conditions, is determined by thermogravimetric analysis and proton nuclear magnetic resonance (1H NMR) spectroscopy, whereas the yield of liquid products is calculated via simulated distillation following the ASTM D7169 standard. The thermogram trends show three zones, one in the range of 100–300 °C, where few chemical changes are observed, one between 300 and 550 °C, where the greatest formation of volatile compounds occurs, and the third, in the range of 550–900 °C, where the mass loss decreases to a constant average weight of 14.8% (±6.3%). In contrast, the fractional conversion curves show two reactivity zones corresponding to the vaporization and thermal cracking stages, with activation energies ranging between 53.9–97.7 and 132.2–192.5 kJ/mol, respectively. It is observed that the activation energy in the cracking zone increases as the vacuum residues become heavier. The tendency of the distillation curves for the liquid products shows a significant increase in the 525 °C fraction yield from each vacuum residue, with the increasing reactivity temperature of the thermal cracking. The analysis of the average molecular parameters via 1H NMR confirms that the reactivity and product yield vary according to the complexity of the molecular structure in the vacuum residues. On the other hand, the results of this research contribute to the development of a methodology of reactivity and compositional characterization by using 1H NMR spectroscopy and multivariate models to evaluate the thermal cracking effect of vacuum residues on a laboratory scale.

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“…Asphaltenes constituents are categorized as the most polar and highest molecular weight fraction of petroleum [26,33] and are considered as the heaviest component in the crude oil [34]. Asphaltenes tend to precipitate and deposit on heat transfer surfaces [35] under changes in pressure and temperature conditions.…”

Section: Asphaltenes Deposition Foulingmentioning

confidence: 99%

CFD Simulations of Crude Oil Fouling on Heat Transfer Surfaces

Gounder¹,

Emani²

2018

Computational Fluid Dynamics - Basic Instruments and Applications in Science

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Advancements in the computational techniques have led to the development of various numerical models and methods to predict the occurrence of crude oil fouling in heat exchangers. Computational fluid dynamics has been employed in the field of crude oil fouling research in the recent past, which led to the concept of investigating the effects of various operating conditions on deposit formations on heat transfer surfaces. Various processes associated with crude oil fouling, such as asphaltenes precipitation and chemical reactions, have been studied through CFD simulations. This chapter provides stateof-the-art review on various CFD approaches and describes the discrete-phase CFD modeling of crude oil fouling through asphaltenes deposition on heat transfer surfaces.

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A Comparative study of the chemical structure of asphaltenes from Algerian petroleum collected at different stages of extraction and processing

Cited by 23 publications

References 54 publications

Molecular Characterization of Nonvolatile Fractions of Algerian Petroleum with High-Resolution Mass Spectrometry

Molecular Characterization of Nonvolatile Fractions of Algerian Petroleum with High-Resolution Mass Spectrometry

Reactivity of Vacuum Residues by Thermogravimetric Analysis and Nuclear Magnetic Resonance Spectroscopy

CFD Simulations of Crude Oil Fouling on Heat Transfer Surfaces

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