Characterisation of aliphatic chains in vacuum residues (VRs) of asphaltenes and resins using molecular modelling and FTIR techniques

Coelho, Roberto Rodrigues; Hovell, Ian; Monte, Marisa Bezerra de Mello; Middea, Antonieta; Souza, André Lopes de

doi:10.1016/j.fuproc.2005.10.010

Cited by 84 publications

(57 citation statements)

References 42 publications

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“…The peaks at frequencies of 3 400-3 200 cm -1 represented the stretching of the carboxylic -OH and N -H groups, while peaks at frequencies of 1 640-1 550 cm -1 corresponded to N-H bending in amide groups [27,34,36]. Also, absorption peaks at 2 920 and 2 865 cm -1 corresponded to methyl and methylene groups (i.e., the stretching in aliphatic groups) [27,37,38]. Methylene and methyl groups have characteristic absorptions of approximately 1 450 and 1 375 cm -1 , respectively (Fig.…”

Section: Ftir Analysismentioning

confidence: 99%

Structural Study of Asphaltenes from Iranian Heavy Crude Oil

Davarpanah

Vahabzadeh

Dermanaki

2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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and available online here Cet article fait partie du dossier thématique ci-dessous publié dans la revue OGST, Vol. 70, n°6, pp. 909-1132 et téléchargeable ici D o s s i e rOil & Gas Science and Technology -Rev. IFP Energies nouvelles, Vol. 70 (2015), No. 6, pp. 909-1132 Copyright © 2015, IFP Energies nouvelles > Editorial -Enhanced Oil Recovery (EOR), Asphaltenes and HydratesÉditorial -EOR «récupération assistée du pétrole», Asphaltènes et Hydrates D. Langevin and F. Baudin ENHANCED OIL RECOVERY (EOR) > HP-HT Drilling Mud Based on Environmently-Friendly Fluorinated ChemicalsBoues de forage HP/HT à base de composés fluorés respectueux de l'environnement Résumé -Étude structurale d'asphaltènes de pétrole brut lourd iranien -Dans la présente étude, la précipitation d'asphaltènes du pétrole brut lourd iranien (au large du golfe Persique) a été effectuée au moyen de n-pentane (n-C 5 ) et de n-heptane (n-C 7 ) comme alcanes légers précipitants. Plusieurs techniques analytiques, chacune utilisant différents principes, ont ensuite été utilisées pour caractériser la structure des asphaltènes précipités. Le rendement en asphaltènes obtenu par l'utilisation du précipitant n-pentane était plus élevé que pour les asphaltènes précipités à l'aide du n-heptane. L'extraction des asphaltènes a affecté les fractions de maltènes n-C 5 et n-C 7 à des températures inférieures à 204 °C, comme l'indiquent les données obtenues par la technique de distillation simulée. La viscosité du pétrole lourd est influencée par la teneur et le comportement des asphaltènes. La dépendance de la viscosité du pétrole lourd testé avec le taux de cisaillement appliqué a été déterminée et l'écoulement était faible à γ. supérieur à 25 s -1 . Les échantillons de pétrole lourd reconstitués ont été préparés en ajoutant différentes quantités d'asphaltènes aux maltènes (pétrole lourd désasphalté) et les effets des asphaltènes ont été plus prononcés à la basse température de 25 °C, comparés à ceux obtenus à des températures plus élevées. Selon le modèle de loi de puissance utilisé dans cette étude, la fluidité du pétrole lourd testé a révélé un caractère pseudoplastique. Les résultats structuraux obtenus à partir de la spectroscopie InfraRouge à Transformée de Fourier (IRTF) ont montré la présence de différents groupes fonctionnels dans les asphaltènes précipités. Par exemple, la présence de différents hydrocarbures (aliphatique, aromatique et alicyclique), basée sur leurs caractéristiques dans le spectre IRTF, a été confirmée. Les résines sont des dispersants efficaces et le retrait de cette fraction du pétrole brut perturbe la nature colloïdale du pétrole lourd, la floculation et la précipitation des asphaltènes finissant par se produire. L'apparition de pores sur les images SEM (Scanning Electron Microscopy) a été utilisée comme indicateur du détachement de la résine. A l'aide de la spectroscopie de Résonance Magnétique Nucléaire (RMN) 1 H et 13 C, deux paramètres structuraux importants des asphaltènes ont été déterminés. A savoir, l'aromaticité (f a ) et...

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Section: Ftir Analysismentioning

confidence: 99%

Structural Study of Asphaltenes from Iranian Heavy Crude Oil

Davarpanah

Vahabzadeh

Dermanaki

2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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“…The absorbance at 1032 cm 1 may also be present because of SDO groups. Hasan et al (1988), Siddiqui and Ali (1999), Wilt andWelch (1998), andCoelho et al (2006) studied FTIR spectra of asphaltenes and determined similar absorption bands for FTIR spectra of Turkish asphaltenes. 1 H-NMR is used along with information on molecular weight, elemental analysis, and XRD to study the chemical structures of Turkish asphaltenes.…”

Section: Resultsmentioning

confidence: 99%

“…Gel permeation chromatography (GPC) has become the prevalent method for determining asphaltene molecular weights. Hasan et al (1988), Siddiqui and Ali (1999), Wilt and Welch (1998) and Coelho et al (2006) studied FTIR spectra of asphaltenes and determined functional groups of asphaltenes. XRD has been widely used to study the macrostructure of asphaltenes (Yen et al, 1961).…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Molecular Structure of Turkish Asphaltenes

Yaşar

Akmaz

Gürkaynak

2009

Petroleum Science and Technology

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Molecular structure of asphaltenes prepared from four Turkish crude oils with different origin were characterized by elemental analysis, proton nuclear magnetic resonance ( 1 H NMR), gel permeation chromatography (GPC) by X-ray diffraction (XRD) and by Fourier transform infrared spectroscopy (FTIR). The X-ray diffraction method was used to investigate the crystallite and aromaticity parameters of the asphaltenes. Average distance between the aromatic sheets, average distance between the aliphatic chains, average diameter of the cluster, and average number of aromatic sheets per stack parameters were calculated for the asphaltenes. The combined NMR, FTIR, molecular weight, elemental content, and XRD results have been used to calculate hypothetical structure of the Turkish asphaltenes.

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“…Asphaltene is the most difficult to define as till now it was noted by many researchers that it is very difficult to isolate them alone and still their chemical formula can't be established yet. Thus the only way to characterized them based on their insolubility in pentane or heptane [13]. The asphaltene content represented by an insoluble content in n-heptane is presented in Table 1.…”

Section: Asphaltene Content Analysis (Astm D 3279)mentioning

confidence: 99%

Investigation on the effect of phase segregation on the mechanical properties of polymer modified bitumen using analytical and morphological tools

et al. 2017

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Abstract. The mechanical strength of polymer modified bituminous mix which is evaluated in terms of stiffness reflects the deformation behaviour of bituminous mixture. The stiffness of the binder strongly depends on its chemical composition besides aggregate structure of the bituminous mixture. Compatibility of polymer with the base bitumen is considered as major strength enhancing factor in the case of polymer modified bituminous mix. To relate the factors affecting the mechanical strength of the binder a new approach in this research study was adopted in order to relate the compatibility of 80/100 pen bitumen with polymer Polypropylene (PP) using analytical and morphological tools. Morphological tools like Atomic Force Microscopy (AFM) and Transmission Electron Microscope (TEM) were used to study the changes due to the difference in compatibility of polymer with bitumen. It was observed that the presence of phase segregated layer as observed by AFM surface morphology was considered as the main strength enhancing factor of the bituminous mix. While the presence of lamella as observed in TEM scanned images of PP PMB revealed that addition of polymer forms localized network in the phase segregated layer which induces the stiffening effect in PMB. From the chromatographic method (SARA) analytical analysis Saturate, Aromatics, Resin and Asphaltene fractionate were determined in the blend. It was observed that chemical composition of the blend also has a profound effect on the rheological properties and on the morphology of polymer modified bituminous (PMB) blend. It was concluded that PP PMB gets benefited by phase segregated layer in the blend when the polymer concentration was kept below 3% as it sufficiently enhances the mechanical strength of the PMB binder as observed by dynamic creep results.

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Characterisation of aliphatic chains in vacuum residues (VRs) of asphaltenes and resins using molecular modelling and FTIR techniques

Cited by 84 publications

References 42 publications

Structural Study of Asphaltenes from Iranian Heavy Crude Oil

Structural Study of Asphaltenes from Iranian Heavy Crude Oil

Investigation of the Molecular Structure of Turkish Asphaltenes

Investigation on the effect of phase segregation on the mechanical properties of polymer modified bitumen using analytical and morphological tools

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