Fractionation of resins and asphaltenes and investigation of their composition and structure using heavy oil from the Usa field as an example

Гринько, А. А.; Головко, А. К.

doi:10.1134/s0965544111030066

Cited by 28 publications

(21 citation statements)

References 10 publications

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“…The content of resins and asphaltenes in the initial and biodegraded bitumen samples was analyzed by standard methods [17]. Asphaltenes were isolated by diluting the sample with n-hexane in a volume ratio of 1:40.…”

Section: Methodsmentioning

confidence: 99%

“…The structural-group analysis (SGA) of resins, asphaltenes, and oils extracted from the initial and biodegraded bitumens was performed by the method developed at the IPC SB RAS. This method is based on the use of combined results of determination of elemental composition, average molecular weights, and PMR spectroscopy data [17,18].…”

Section: Methodsmentioning

confidence: 99%

“…Proton magnetic resonance spectra were registered using an AVANCE-AV-300 NMR Fourier spectrometer at concentration of the substances under study 1 wt.% using deuterochloroform as solvent and hexamethyldisiloxane as internal standard. The data of structural-group analysis (SGA) were represented by the same symbols of the structural parameters, which were used in previous studies [17,18]. Namely, C a , C n , C α , C p , C γ are the numbers of carbon atoms in the aromatic, naphthenic, and paraffinic structures of molecules, α-positions to heterofunсtions and aromatic rings, and in terminal methyl groups (С γ ) not bounded with the latter, respectively; f а , f н and f п are the fractions of carbon atoms in the corresponding structural fragments; R t is the total number of rings, R a and R n are the numbers of aromatic and naphthenic cycles per mean molecule; ma is the average number of structural units per molecule.…”

Section: Methodsmentioning

confidence: 99%

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Microbiological Oxidation of High Viscosity Bitumen in Soil

Filatov

Kopytov

Ovsyannikova

et al. 2018

Eurasian Chem. Tech. J.

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This paper presents the results of an investigation of microbiological oxidation in the model soil system of high viscosity bitumen from the Bayan-Erkhet deposit (Mongolia) with a high content of heteroelements. It is shown that bitumen, being a mixture of high molecular weight components, has no inhibitory effect on the indigenous soil microflora. Its active growth in the presence of oil products starts without adaptation and lasts for a good part of experiment resulting in 15-30 fold excess of microorganisms over its reference number. The enzymatic activity of the contaminated soil increases by a factor of 1.5-2.0, which indicates an assimilation of various hydrocarbon compounds. The weight analysis revealed that the biodegradation of oil products after 180 days of the experiment was 50% of the initial contamination at initial waste oil concentration 50 g/kg (5%). The analysis by IR spectroscopy revealed an accumulation of oxygen-containing compounds which are intermediate products of bio-oxidation of bitumen components. The method of chromatography-mass spectrometry (GC-MS) revealed the ability of aboriginal soil microflora to mineralize virtually all hydrocarbons contained in the bitumen under study. Their biodegradation ranges from 18 to 97%. It was shown by the GC-MS method that high-molecular heteroatomic components of bitumen (resins and asphaltenes) also undergo a microbial degradation, since their molecular structure changed after the destruction. Thus, the number of structural units in a hypothetical molecule and that of heteroatoms increased due to the high content of oxygen-containing structures. In addition, the ratio of hydrocarbons (oils), resins, and asphaltenes contained in the sample is also changed.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Microbiological Oxidation of High Viscosity Bitumen in Soil

Filatov

Kopytov

Ovsyannikova

et al. 2018

Eurasian Chem. Tech. J.

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“…Zhang et al 10 analyzed the composition and structure of gums in crude oil from the South China Sea and pointed out that it is a molecule with an aromatic ring connected by an alkyl chain. Grin’Ko et al 11 found that the average molecular weight of Usa heavy oil gum is between 558 and 845 through fractionation and pointed out that this kind of gum molecular paraffin chain has a small length and a slightly branched block structure. Collell et al 12 analysis showed that the average molecular formula of gum in American shale oil is C 26 H 32 O, which is composed of condensed aromatic rings with alkyl side chains and several naphthenic rings.…”

Section: Introductionmentioning

confidence: 99%

Structure Characterization and Solubility Analysis of the Existent Gum of the Fischer–Tropsch Synthetic Crude

et al. 2020

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The existent gum content of the Fisher–Tropsch synthetic crude exceeded the standard seriously, affecting its transportation and use. To determine the structure of the existent gum extracted from the Fisher–Tropsch synthetic crude, elemental analysis, Fourier transform infrared (FT-IR) spectroscopy, nuclear magnetic resonance (NMR), and X-ray photoelectron spectroscopy (XPS) were employed to determine the chemical structure of the gum. The Brown–Ladner method is used to calculate the average structural parameters and the average molecular formula of the existent gum. The results show that the existent gum of the Fisher–Tropsch synthetic crude is composed of heterocyclic aromatic hydrocarbons and short-carbon paraffins. Compared with petroleum gums and coal tar gums, the existent gum content of the Fisher–Tropsch synthetic crude has the characteristics of high aromaticity, short side chains, and nitrogen-containing heterocycles. After being oxidized, its aromaticity further increases, more closed loops are formed, and the side chain is further shortened. This is caused by a complex oxidation reaction during the oxidation process. Molecular dynamics simulation calculations were performed to reveal the T-stacked morphology of the existent gum of the Fisher–Tropsch synthetic crude in a mixed solvent of acetone and toluene.

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“…Heavy fractions of crude oil and distillation residues contain more amounts of resins and asphaltenes [11]. However, there is a trend towards the use of heavier feedstock, which requires additional processes based on the destruction of heavy petroleum compounds and lead to an increase in the portion of light fractions in feedstock [12].…”

Section: Introductionmentioning

confidence: 99%

Bioconversion of Heavy Hydrocarbon Cuts Containing High Amounts of Resins by Microbial Consortia

Ghollami¹,

M²,

Ghavipanjeh³

et al. 2013

J Pet Environ Biotechnol

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Microbial conversion of petroleum resins existing in a heavy fraction of crude oil was investigated by native isolated consortia. The heavy oil fraction was taken from an end cut of distillation tower of Abadan refinery in Iran. Several Soil samples were taken from different oil contaminated sites of Abadan oil refinery in Khuzestan province. Seven bacterial consortia were then prepared by enrichment method and were examined for their ability to convert resins. Amongst them, consortium AB6 reduced 37.3% of resins while, aliphatic and aromatic compounds increased by 86.8% and 6.7%, respectively. Three pure cultures were isolated from consortium AB6 which were identified as Serratia sp., Raoultella sp. and Ochrobactrum sp.

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Fractionation of resins and asphaltenes and investigation of their composition and structure using heavy oil from the Usa field as an example

Cited by 28 publications

References 10 publications

Microbiological Oxidation of High Viscosity Bitumen in Soil

Microbiological Oxidation of High Viscosity Bitumen in Soil

Structure Characterization and Solubility Analysis of the Existent Gum of the Fischer–Tropsch Synthetic Crude

Bioconversion of Heavy Hydrocarbon Cuts Containing High Amounts of Resins by Microbial Consortia

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