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Chemical visualization of asphaltenes aggregation processes studied in situ with ATR-FTIR spectroscopic imaging and NMR imaging / A. A. Gabrienko [et al.] // J. Phys. Chem. C. - 2015. - Vol. 119, Is. 5. - P. 2646-2660, DOI 10.1021/jp511891f. - Cited References:78. - This research was performed under the UNIHEAT project. The authors wish to acknowledge the Skolkovo Foundation and BP for financial support. The authors thank BP for providing samples of crude oil . - ISSN 1932-7447

РУБ Chemistry, Physical + Nanoscience & Nanotechnology + Materials Science, Multidisciplinary
Рубрики:
MEXICAN CRUDE OILS
   X-RAY-DIFFRACTION
   INFRARED-SPECTROSCOPY
   PETROLEUM ASPHALTENES
   MOLECULAR-DYNAMICS
   VARIABLE SELECTION
   ORGANIC-SOLVENTS
   LIGHT-SCATTERING
   N-HEPTANE
   NEAR-IR
Аннотация: Crude oil phase behavior and asphaltene precipitation have been studied by two complementary chemical imaging methods for the first time. ATR-FTIR spectroscopic imaging approach has revealed the chemical composition of agglomerated and precipitated asphaltenes upon dilution with a flocculant. Asphaltenes, containing oxygen and nitrogen heteroatomic functional groups, have been detected to be least stable. Aromatic abundant asphaltenes have been observed to have relatively high solubility in crude oil/heptane blends. NMR imaging approach, capable of imaging in the bulk of crude oil samples, has demonstrated that n-heptane causes aggregation which can lead to the stable suspension or to the sedimentation followed by the formation of deposits, depending on flocculant concentration. These processes have been monitored for small and large amounts of heptane added to crude oil. The data obtained by ATR-FTIR spectroscopic imaging and NMR imaging have been correlated to propose a possible link between the chemical structure of asphaltenes and a mechanism of the formation of deposits.

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Держатели документа:
Univ London Imperial Coll Sci Technol & Med, Dept Chem Engn, London SW7 2AZ, England.
Russian Acad Sci, Siberian Branch, Boreskov Inst Catalysis, Novosibirsk 630090, Russia.
Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
UNICAT Ltd, Novosibirsk 630090, Russia.
BP Prod North Amer Inc, Refining & Logist Technol, Naperville, IL 60563 USA.
Novosibirsk State Univ, Novosibirsk 630090, Russia.

Доп.точки доступа:
Gabrienko, A. A.; Morozov, E. V.; Морозов, Евгений Владимирович; Subramani, V.; Martyanov, O. N.; Kazarian, S. G.; Skolkovo Foundation; BP
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In-situ studies of crude oil stability and direct visualization of asphaltenes aggregation processes via some spectroscopy techniques / E. V. Morozov [et al.] // Abstr. Pap. Am. Chem. Soc. - 2014. - Vol. 248. - P. 531-ENFL. - Cited References:0 . - ISSN 0065-7727

РУБ Chemistry, Multidisciplinary

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Доп.точки доступа:
Morozov, E. V.; Морозов, Евгений Владимирович; Trukhan, S. N.; Трухан С. Н.; Larichev, Y. V.; Subramani, V.; Gabrienko, A. A.; Kazarian, S. G.; Martyanov, O. N.; National Meeting of the American-Chemical-Society (ACS)(San Francisco, CA)(248 ; Aug. 10-14, 2014)
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Morozov, E. V.
Probing flocculant-induced asphaltene precipitation via NMR imaging: from model toluene-asphaltene systems to natural crude oils / E. V. Morozov, O. N. Martyanov // Appl. Magn. Reson. - 2016. - Vol. 47, Is. 2. - P. 223-235, DOI 10.1007/s00723-015-0741-9. - Cited References:46. - This research was performed with the financial support of Russian Science Foundation (project no. 15-19-00119). . - ISSN 0937-9347. - ISSN 1613-7507

РУБ Physics, Atomic, Molecular & Chemical + Spectroscopy
Рубрики:
PETROLEUM ASPHALTENES
   MOLECULAR-DYNAMICS
   AGGREGATION
   MICROSCOPY
   SCATTERING
   RESONANCE
   SEDIMENTATION
   ASSOCIATION
   CALORIMETRY
   RELAXATION
Аннотация: An nuclear magnetic resonance (NMR) imaging approach for studying flocculant-induced asphaltene precipitation processes is introduced in this report. Unlike commonly accepted techniques, which primarily measure aggregation processes on the submicron scale (the level of asphaltene molecules and their aggregates), NMR imaging demonstrates the capability to obtain new useful information about bulk system behavior on the macro scale. To reveal the capabilities of the method, the model toluene-asphaltene system and two samples of natural crude oils with different chemical composition and physical properties (such as asphaltene content and density) were employed for experiments. The process of colloidal suspension formation and two different patterns of its evolution were observed depending on both the asphaltene content and the flocculant concentration. In the first pattern, the flocculant-induced precipitation leads to the slow uniform compacting of the suspension and descent of the sedimentation front, whereas the second pattern is characterized by sediment accumulation and the upwards drift of the front. It was found that the behavior of the precipitated asphaltenes in the model system correlates well with those observed in natural crude oils. The results achieved in this work are in agreement with the data obtained previously via other techniques. Thus, NMR imaging proved to be an efficient method for probing flocculant-induced precipitation in crude oils.

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Держатели документа:
Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Akademgorodok 50-24, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Akademgorodok 50-24, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Siberian Branch, Boreskov Inst Catalysis, Pr Ak Lavrentieva 5, Novosibirsk 630090, Russia.
Novosibirsk State Univ, Pirogova St 2, Novosibirsk 630090, Russia.

Доп.точки доступа:
Martyanov, O. N.; Морозов, Евгений Владимирович; Russian Science Foundation [15-19-00119]
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Morozov, E. V.
Reversibility of asphaltene aggregation as revealed by magnetic resonance imaging in situ / E. V. Morozov, O. N. Martyanov // Energy Fuels. - 2017. - Vol. 31, Is. 10. - P. 10639-10647, DOI 10.1021/acs.energyfuels.7b01755. - Cited References: 56. - This research was performed on the equipment of Krasnoyarsk Regional Research Equipment Centre of Siberian Branch of Russian Academy of Sciences with the financial support of Russian Science Foundation (Project No. 15-19-00119). . - ISSN 0887-0624
Кл.слова (ненормированные):
Aggregates -- Crude oil -- Flocculation -- Heavy oil production -- Magnetic resonance imaging -- Asphaltene aggregates -- Asphaltene aggregation -- Asphaltene precipitation -- Equilibrium compositions -- Flocculant concentrations -- Inhomogeneous distribution -- Mechanical stirring -- Multi-component systems -- Asphaltenes
Аннотация: Aggregation of asphaltenes followed by precipitation presents severe problems for existing technologies in the production, recovery, and processing of heavy oils. Better understanding of asphaltene behavior behind the processes of their precipitation and dissolution is vital to address this issue. While investigating the inhomogeneity of different oil systems, the reversibility of the asphaltene aggregation process initiated by flocculant in either asphaltene solution in toluene or crude heavy oil was revealed and investigated using magnetic resonance imaging methods. It was found that the inhomogeneous distribution of the flocculant initiates local spatial-selective asphaltene aggregation registered in a thin layer around the flocculant/oil sample interface. The local excess of flocculant concentration over the threshold of asphaltene precipitation onset is a driving force of this process. As the flocculant diffuses into the volume of the sample, a decrease of the asphaltene flocculated area is observed until it disappears when the equilibrium composition throughout the whole volume of the system is achieved. Depending on the overall flocculant concentration, the asphaltene aggregation may not be reversible and could be followed by subsequent precipitation of the asphaltene aggregates. The similarity of the phenomena observed for the model asphaltene solutions and crude heavy oil samples was established. Partial mechanical stirring of the multicomponent system comprising flocculant and oil or asphaltene solution does not prevent the formation of the local zones with increased concentration of asphaltene aggregates; those sizes evolve depending on the flocculant concentration. The results obtained in this work are consistent with the generally accepted concept of asphaltene precipitation reversibility depending on the system composition and are compatible with the observations obtained by other methods. The approach presented can provide deeper insight into the asphaltene precipitation reversibility issue and can facilitate the understanding of asphaltene behavior in heavy oils.

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Держатели документа:
Institute of Chemistry and Chemical Technology, Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50/24, Krasnoyarsk, Russian Federation
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50/38, Krasnoyarsk, Russian Federation
Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Pr. Ak. Lavrentieva 5, Novosibirsk, Russian Federation
Novosibirsk State University, Pirogova str. 2, Novosibirsk, Russian Federation

Доп.точки доступа:
Martyanov, O. N.; Морозов, Евгений Владимирович
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