Polar-solvent fractionation of asphaltenes from heavy oil and their characterization

Petrova, L. M.; Abbakumova, N. A.; Zaidullin, I. M.; Borisov, D. N.

doi:10.1134/s0965544113020084

Cited by 20 publications

(8 citation statements)

References 19 publications

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“…Many previous reports have discussed the trends amongst subfractions when using similar binary solvent systems, for example aromaticity was found to monotonically increase across subfractions with decreasing solubility and H/C ratio (Buch et al, 2003;Buenrostro-Gonzalez et al, 2002;Jacobs and Filby, 1983;Kaminski et al, 2000;Ovalles et al, 2012;Petrova et al, 2013;Tojima et al, 1998;Trejo et al, 2004;Yang and Eser, 1999). However effort to compare the subfractions in terms of their structural differences and use this approach to further probe the fractionation/precipitation mechanisms are scarce.…”

Section: Introductionmentioning

confidence: 91%

“…As a complex mixture, the polydispersity of asphaltenes has greatly hampered the progress of its characterisation studies. A great deal of work has been conducted on fractionation of asphaltenes in the past (Andersen et al, 1997;Andreatta et al, 2005;Buch et al, 2003;Buenrostro-Gonzalez et al, 2002;Dickie and Yen, 1967;Groenzin et al, 2003;Jacobs and Filby, 1983;Kaminski et al, 2000;Nalwaya et al, 1999;Ovalles et al, 2012;Petrova et al, 2013;Tojima et al, 1998;Trejo et al, 2004;Wiehe and Liang, 1996;Yang and Eser, 1999). In the literature, binary solvent systems are commonly used to fractionate asphaltenes.…”

Section: Introductionmentioning

confidence: 99%

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Characterisation of subfractions of asphaltenes extracted from an oil sand using NMR, DEPT and MALDI-TOF

Zheng

Zhu

Zareie

et al. 2018

Journal of Petroleum Science and Engineering

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This paper reports the findings of an investigation into molecular structures and properties of an oil sand asphaltene sample and its subfractions. The asphaltene sample extracted from Buton Oil Sand (Indonesia) was fractionated stepwise into four subfractions by precipitation in a binary solvent system made from mixtures of dichloromethane/n-heptane with volumetric ratios of 30/70, 20/80 and 10/90, respectively. The average molecular structural parameters, including the average polycyclic aromatic hydrocarbon size, average side chain length and average molecular weight of the oil sand asphaltene sample and its subfractions, were measured and compared, using characterisation data obtained from nuclear magnetic resonance in combination with distortionless enhancement by polarisation transfer. The molecular weight distributions of the asphaltene samples were measured using a matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry. The results indicated that the island molecular architecture was featured in all the asphaltene samples. The average polycyclic aromatic hydrocarbon size was found to be 7 rings for the least soluble subfraction, 6 rings for the other subfractions and the oil sand asphaltenes. The fractionation mechanism was dictated by polarity difference amongst subfractions as a result of relative luxuriance of the aliphatic parts. The use of 13 C NMR, DEPT and MALDI-TOF was shown to provide a useful means for characterisation and estimation of molecular structures of the asphaltenes.

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Characterisation of subfractions of asphaltenes extracted from an oil sand using NMR, DEPT and MALDI-TOF

Zheng

Zhu

Zareie

et al. 2018

Journal of Petroleum Science and Engineering

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“…The authors of the next papers , proposed a scheme for fractionating asphaltenes when blended with acetone in the ratio of acetone–vacuum residue of 3:1 and then dividing them into two parts, containing mainly high molecular weight (resin–asphaltene concentrate) and low molecular weight (de-asphalted oil). Asphaltenes are isolated from each part with n -heptane (1:40 (v/v)), and then separated in the Soxhlet apparatus in a ratio of 1.85:1 (v/v) (Scheme ).…”

Section: Extraction Methods For the Separation Of Asphaltenes And The...mentioning

confidence: 99%

Simple Methods for the Separation of Various Subfractions from Coal and Petroleum Asphaltenes

et al. 2020

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This review contains some actual information about more interesting and perspective methods of coal and petroleum asphaltenes separation, fractionation, extraction, adsorption, and complexation. These are the most convenient and simple methods for isolating various components of asphaltenes. These methods are based on the electrostatic and donor–acceptor properties of the used reagents and on unique and incompletely understood phenomena. A promising area is the use of ionic liquids as a convenient and mild isolation of asphaltene components. Understanding and identifying the diverse molecular composition of asphaltene components will help one to understand their nature more fully in the future and, more precisely, physicochemical interactions and phenomena.

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“…A notable feature of resin-asphaltene substances, are high molecular weights, presence of poly condensed aromatic structures [6][7][8] and high content of heteroatoms [9,10]. These structural features of the SAR contribute to their tendency to association, aggregation and, as a consequence, the formation of deposits, which leads to complications in the processes of oil production, transportation and preparation [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

The Structural Features of Resins and Asphaltenes of Crude Oils From Udmurtia Oilfields

Miller¹,

Ivanova

Mansur

et al. 2021

IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TE

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Исследованы физико-химические свойства, групповой химический и структурногрупповой состав нефтей месторождений Карсовай и Гремиха, а также состав стабилизационного слоя промысловой водонефтяной эмульсии, образованной нефтью месторождения Гремиха. Выделены и изучены методами ИК Фурье спектроскопии, 13 С и 1 Н ЯМР спектроскопии смолы и асфальтены из исследуемых нефтей и асфальтены из межфазного слоя ВНЭ, и выявлены особенности их элементного и структурно-группового состава. Установлено, что в составе нефти месторождения Гремиха в 3 раза выше содержание асфальтенов, а содержание смол и твердых парафинов, напротив, ниже. Данная нефть характеризуется высокой плотностью и высокой кинематической вязкостью, что позволяет отнести ее к битумозным нефтям. Структурно-групповой анализ асфальтенов и смол, выделенных стандартными методами из исследуемых нефтей, показал, что асфальтены нефти месторождения Гремиха близки по значению молекулярных масс к асфальтенам, выделенным из нефти месторождения Карсовай, но характеризуются более высокой долей конденсированных ароматических и нафтеновых структур. В составе смол исследуемых нефтей наблюдается обратный порядок. Высокая агрегативная устойчивость водонефтяной эмульсии, образованной нефтью месторождения Гремиха, объясняется количественным и качественным составом природных поверхностно-активных соединений, присутствующих в данной нефти. Анализ природных стабилизаторов, выделенных из межфазного слоя ВНЭ, показал значительное преобладание в его составе асфальтенов (92,6%), отличающихся более высокой молекулярной массой и более высокой долей конденсированных циклических структур, с преобладанием ароматических колец и со значительной долей, по сравнению с исходной нефтью, нафтеновых структур. Повышенное содержание гетероатомов (S, N и О) в составе молекул асфальтенов из стабилизационного слоя, также указывает на более высокие поверхностноактивные свойства этих соединений.

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Polar-solvent fractionation of asphaltenes from heavy oil and their characterization

Cited by 20 publications

References 19 publications

Characterisation of subfractions of asphaltenes extracted from an oil sand using NMR, DEPT and MALDI-TOF

Characterisation of subfractions of asphaltenes extracted from an oil sand using NMR, DEPT and MALDI-TOF

Simple Methods for the Separation of Various Subfractions from Coal and Petroleum Asphaltenes

The Structural Features of Resins and Asphaltenes of Crude Oils From Udmurtia Oilfields

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