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Morozov, E. V.
New insight into the wax precipitation process: in situ NMR imaging study in a cold finger cell / E. V. Morozov, O. V. Falaleev, O. N. Martyanov // Energy Fuels. - 2016. - Vol. 30, Is. 11. - P. 9003-9013, DOI 10.1021/acs.energyfuels.6b01535. - Cited References: 69. - This research was performed with the financial support of the Russian Science Foundation (Project No. 15-19-00119). . - ISSN 0887-0624
Кл.слова (ненормированные):
Cells -- Crude oil -- Cytology -- Deposits -- Diffusion -- Gelation -- Magnetic resonance imaging -- Ostwald ripening -- Phase separation -- Polymer blends -- Deposit formation -- Deposit structures -- Diffusion controlled growth -- Dominant mechanism -- Lower temperatures -- Morphology and dynamics -- Phase-separation process -- Temperature regimes -- Image processing
Аннотация: A cold finger cell intended for the wax deposition measurements was fabricated and integrated into an NMR imaging probe for the noninvasive study of wax precipitation processes in situ. The cell was first tested with a model system; then, a series of experiments with different thermal gradients applied to the cell were performed for a waxy crude oil. NMR imaging of the operating cell revealed the formation of a deposit with the morphology and dynamics strongly correlating with the temperature regime. At higher temperatures of cold finger, the incipient wax gel ages uniformly, giving rise to the hard and thin inner layer of deposit accompanied by a branched loosely consolidated outer layer. Conversely, the lower temperatures facilitate formation of a thick deposit which no longer ages uniformly and slow down the diffusion-controlled growth of the branched deposit structure. The results obtained are consistent with the majority of the data previously reported. Thus, gelation of the wax at temperatures below the cloud point and subsequent thermal-driven diffusion processes are considered to be the dominant mechanisms of the deposit formation. The counter diffusion and Ostwald ripening aging concepts were found to be relevant in the case of the cold finger study and account for the phenomena observed in this work. The information obtained via NMR imaging is highly complementary to the results obtained by other techniques that can aid in understanding the essential processes behind the wax precipitation phenomena. The approach developed can be effectively extended to study any thermal-driven phase separation process. © 2016 American Chemical Society.

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

Доп.точки доступа:
Falaleev, O. V.; Martyanov, O. N.; Морозов, Евгений Владимирович
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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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Influence of different organic fuels on the phase composition, structure parameters and magnetic properties of hexaferrites BaFe12O19 synthesized by the sol-gel combustion / V. A. Zhuravlev [et al.] // J. Alloys Compd. - 2019. - Vol. 771. - P. 686-698, DOI 10.1016/j.jallcom.2018.08.294. - Cited References: 56. - This work was performed under the Program for Improving Tomsk State University Competitiveness among the World's Leading Scientific and Educational Centers. Part of the work related to the synthesis of the materials was carried out within the framework of the state task of the FASO (Project No 0365-2018-0003 ) for the Tomsk Scientific Center, SB RAS. Part of the work related to the study of magnetization curves was partially funded by RFBR Grant No 16-02-00563. . - ISSN 0925-8388
Кл.слова (ненормированные):
Sol-gel combustion -- Nanocrystalline hexaferrites -- Magnetization curve -- Ferromagnetic resonance -- Magnetocrystalline anisotropy
Аннотация: Phase composition, structure parameters, morphology and basic magnetic characteristics – the specific saturation magnetization values and the magnetic anisotropy fields of the nanostructured BaFe12O19 powders prepared by the sol-gel combustion with the following annealing at 850°С for six hours are investigated. As organic fuels the following materials are used: carbamide (CON2H4), sucrose (C12H22O11), glycine (C2H5NO2) and citric acid (C6H8O7). The influences of the type of the organic fuels on the properties of synthesized materials are analysed. It is shown that in the powders obtained the distribution of particles on the size, the values of saturation magnetizations and the anisotropy fields depend on the fuel type. The sample synthesized using carbamide has the smallest content of the target phase BaFe12O19, the widest particle size distribution and the lowest value of the saturation magnetization in comparison with the other samples. The narrowest distribution of the particles on the size and the highest value of the specific saturation magnetization are observed in the material synthesized with the use of citric acid as an organic fuel. A comparison of the experimental hysteresis loops with the calculated magnetization curves is made. It is shown that the paraprocess plays a significant role in the magnetization processes of the synthesized materials (χpara. ≈ 0.125*10−3 cm3/g). A technique for determining the values of the anisotropy fields and the magnetomechanical ratios from experiments on FMR is also described. Calculations of the magnetization curve and the ferromagnetic resonance line of hexaferrites powders with uniaxial anisotropy were carried out in the independent grains approach.

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Держатели документа:
Tomsk State University, Tomsk, 634050, Russian Federation
Tomsk Scientific Center, SB RAS, Tomsk, 634021, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Zhuravlev, V. A.; Itin, V. I.; Minin, R. V.; Lopushnyak, Y. M.; Svetlichnyi, V. A.; Lapin, I. N.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Lilenko, I. Y.
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The impact of cavitation-activated water on combustion dynamics and environmental characteristics of coal-water slurry fuel / O. P. Stebeleva [et al.] // IOP Conf. Ser.: Mater. Sci. Eng. - 2019. - Vol. 537: International Workshop on Advanced Technologies in Material Science, Mechanical and Automation Engineering - MIP: Engineering-2019 (4 April 2019 through 6 April 2019) Conference code: 149243, Is. 6. - Ст. 062056, DOI 10.1088/1757-899X/537/6/062056. - Cited References: 8
Рубрики:
Chemical, Ecological and Power Engineering
Кл.слова (ненормированные):
Angular velocity -- Cavitation -- Coal -- Conservation -- Dynamics -- Ecology -- Fuels -- Ignition -- Water treatment
Аннотация: Among the new coal technologies the burning of low-grade coal in the form of coal-water slurry fuel (CWSF) is of a great interest. The basis of CWSF is a highly concentrated coal-water slurry consisting of finely ground coal, water or other liquid and plasticizing agents. The development of CWSF technology is highly relevant for solving global problems of resource conservation and ecology. The study is dedicated to CWSF properties with respect to Kansk-Achinsk coal and water. This paper presents the results of the influence of CWSF's preliminary cavitation water treatment on the combustion dynamics of fuel, (including the features of the combustion temperature trends, delayed ignition time and time of complete combustion) and on its environmental characteristics. A rotary-type hydrodynamic oscillator at high angular velocity (10000 rpm) was used in supercavitation mode. It is shown that the technology of cavitation water treatment leads to a change in the dynamics of CWSF's combustion and to an additional decrease in NOx emissions by 1.6 times, CO2 by 1.3 times.

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Держатели документа:
Siberian Federal University, 79, Svobodnyy Ave, Krasnoyarsk, 660049, Russian Federation
Federal Research Center, Krasnoyarsk Scientific Center, Siberian Branch of the Russian Academy of Sciences, L.V. Kirensky Institute of Physics, SB RAS, 50 Akademgorodok, Krasnoyarsk, 660021, Russian Federation
National Research Tomsk Polytechnic University, Tomsk, 634050, Russian Federation

Доп.точки доступа:
Stebeleva, O. P.; Kashkina, L. V.; Petrakovskaya, E. A.; Петраковская, Элеонора Анатольевна; Nikitin, S. L.; Valiullin, T. R.; International Workshop on Advanced Technologies in Material Science, Mechanical and Automation Engineering(2019 ; April ; 4-6 ; Krasnoyarsk, Russian Federation)
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Morozov, E. V.
Temperature-Triggered Rearrangement of Asphaltene Aggregates as Revealed by Pulsed-Field Gradient NMR / E. V. Morozov, P. V. Yushmanov, O. N. Martyanov // Energy Fuels. - 2019. - Vol. 33, Is. 8. - P. 6934-6945, DOI 10.1021/acs.energyfuels.9b00600. - Cited References: 119. - This research was performed using 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. - ISSN 1520-5029

РУБ Energy & Fuels + Engineering, Chemical
Рубрики:
CRITICAL NANOAGGREGATE CONCENTRATION
ELECTRON-SPIN-RESONANCE
Аннотация: The tendency of asphaltenes for aggregation followed by precipitation and deposition plays a crucial role in the petroleum industry since these processes present severe problems during the production, recovery, and processing of crude oils and fossil hydrocarbon feedstocks. The dynamics of oil asphaltene aggregates dissolved in chloroform at different concentrations varied in a wide range that was investigated at temperatures from 0 to 55 °C using the Pulsed-Field Gradient NMR technique. The components attributed to nanoaggregates and macroaggregates were successfully resolved, which allowed us to measure their diffusion coefficients. The diffusion coefficients for all types of aggregates grow as the asphaltene concentration decreases, whereas the partial weight of the aggregates increases with the increase of asphaltene concentration. The difference in diffusion behavior of the aggregates of different types was registered when passing the critical concentration range 10–20 g/L. The nano- and macroaggregates behave independently when the asphaltene concentration is higher than 20 g/L (concentrated regime), while below 20 g/L (semidiluted regime) the components related to the different types of aggregates cannot be properly resolved. It was found that regardless of the asphaltene concentration, the diffusion coefficients for nano- and macroaggregates demonstrate similar temperature behavior giving the straight lines in the Arrhenius coordinates which change their slopes when passing the temperature range 20–30 °C. The phenomenon evidences the thermally induced cleavage of noncovalent bonds with subsequent rearrangement of asphaltene aggregates that is observed for all concentration regimes covering the existence of asphaltene aggregates of all types. The data obtained are well consistent with the modern concept of asphaltene aggregate structure and fairly agree with the data obtained earlier. We believe these results will contribute essentially to a better understanding of the fundamental behavior of asphaltenes and their aggregates, providing a deep insight into aggregate transformation triggered by the temperature.

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Держатели документа:
SB RAS, Inst Chem & Chem Technol, Fed Res Ctr, Krasnoyarsk Sci Ctr, Akademgorodok 50-24, Krasnoyarsk 660036, Russia.
SB RAS, Kirensky Inst Phys, Fed Res Ctr, Krasnoyarsk Sci Ctr, Akademgorodok 50-38, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Siberian Branch, Boreskov Inst Catalysis, Ak Lavrentieva 5, Novosibirsk 630090, Russia.
P&L Sci Instrument Serv, Box 1241, S-18124 Lidingo, Sweden.
Novosibirsk State Univ, Pirogova Str 2, Novosibirsk 630090, Russia.

Доп.точки доступа:
Yushmanov, Pavel, V; Martyanov, Oleg N.; Морозов, Евгений Владимирович; Russian Science FoundationRussian Science Foundation (RSF) [15-19-00119]
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Effect of cavitational conditioning of water on stability of coal-water slurry / O. P. Stebeleva, L. V. Kashkina, T. V. Rubleva [et al.] // J. Phys. Conf. Ser. - 2020. - Vol. 1679, Is. 5. - Ст. 052045DOI 10.1088/1742-6596/1679/5/052045. - Cited References: 13
Кл.слова (ненормированные):
Computerized tomography -- Fuels -- Magnetic resonance -- Coal water fuel -- Coal water slurry -- Distilled water -- Kansk-Achinsk coals -- Local density -- Magnetic resonance tomography -- Rheological characteristics -- Vertical axis -- Coal
Аннотация: Coal-water slurry (CWS) is the basis of modern alternative fuel - coal-water fuel (CWF). To produce stable coal-water slurry, i.e. coagulation and separation is an important technological problem. The paper studies CWS the disperse part of which is fine brown Kansk-Achinsk coal, the dispersive part is distilled water. Effect of cavitational conditioning on CWS stability has been studied. The efficiency was for the first time studied by magnetic resonance tomography (MRT). In the experiment spin-lattice relaxation time profiles T1 were recorded along the central vertical axis of the samples. T1 dynamics correlates well with the local density of CWS solid phase. MRT data was sequentially interpreted with rheological characteristics of CWS. Feasibility of applying MRT method to find out time and space evolution of CWS has been estimated. The MRT methods has been shown to be efficient in resolution of technological problems to improve consumer properties of the coal-water fuel.

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Держатели документа:
Siberian Federal University, Svobodnyy Ave 79, Krasnoyarsk, 660049, Russian Federation
Federal Research Center "krasnoyarsk Scientific Center, The Siberian Branch of the Russian Academy of Sciences, L.V. Kirensky Institute of Physics SB RAS, Krasnoyarsk 50, Akademgorodok, 660021, Russian Federation
Federal Research Center, "Krasnoyarsk Scientific Center of the Siberian Branch of the Russian Academy of Sciences", Akademgorodok, 50, Krasnoyarsk, 660021, Russian Federation

Доп.точки доступа:
Stebeleva, O. P.; Kashkina, L. V.; Rubleva, T. V.; Dobrosmyslov, S. S.; Добросмыслов, С. С.; Vshivkova, O. A.; International Scientific Conference on Applied Physics, Information Technologies and Engineering(2nd ; 25 September - 4 October 2020 ; Krasnoyarsk, Russian Federation)
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Morozov, E. V.
From components to phase-dependent dynamics of diffusivity in wax solutions subjected to fluid-solid phase transition: Insights from Pulsed Field Gradient NMR / E. V. Morozov, P. V. Nizovtseva, O. N. Martyanov // Energy Fuels. - 2022. - Vol. 36, Is. 24. - P. 14696-14709, DOI 10.1021/acs.energyfuels.2c02943. - Cited References: 76. - The present research was performed with the financial support of the Russian Science Foundation (project no. 21-13-00171, http://rscf.ru/project/21-13-00171/) . - ISSN 0887-0624. - ISSN 1520-5029
Кл.слова (ненормированные):
Concentration ranges -- Crystal networks -- Diffusion components -- Fluid-solid phase transition -- N-dodecane -- Phase dependent -- Pulsed field gradient NMR -- Supplementary information -- Wax appearance temperature -- Wax crystals
Аннотация: The evolution of solvent and solute diffusivity during fluid-solid phase transition was studied in model wax in n-dodecane solutions in a wide concentration range. Studied systems were characterized using viscosity measurements to provide supplementary information related to wax precipitation onset, while diffusion coefficients of n-dodecane and paraffin molecules were quantified using Pulsed Field Gradient (PFG) NMR. It was revealed that above the wax appearance temperature (WAT), the Hayduk-Minhas equation adequately predicts the solute and solvent diffusivity. At lower temperatures (below the WAT), three distinct diffusive components appear, which no longer originate from individual molecular components but correspond to a liquid phase differing in terms of association to the wax crystal network. These diffusion components were concluded to contain dodecane and the residual dissolved wax; the major components among them correspond to fluid, which relatively freely diffuses between the wax microcrystals and experiences the hindrance due to the wax gel network, and the minor components correspond to the fluid closely associated with the wax crystals. Unlike at high temperatures, the Hayduk-Minhas equation was found to be unable to predict adequately the diffusivity below the WAT. Using Singh's approach, the aspect ratio of wax crystals was calculated for different temperatures and concentrations and its complex nonlinear behavior was observed. It turned out that none of the models available differentiate the fluids with respect to the wax crystal network that leaves out of modeling the diffusion components with reduced mobility. The results indicate that the intuitive paradigm of component-dependent dynamics of solvent and solute diffusivity should be changed to phase-dependent dynamics once the system turns into wax gel since the diffusion of separate components becomes the diffusion of separate phases. This understanding shows a new route to improving the wax deposition modeling, which will facilitate an increase of effectiveness of the remedial strategies in the petroleum industry.

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Держатели документа:
Institute of Chemistry and Chemical Technology, Federal Research Center, Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50/24, Krasnoyarsk, 660036, Russian Federation
Kirensky Institute of Physics, Federal Research Center, Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50/38, Krasnoyarsk, 660036, Russian Federation
Reshetnev Siberian State University of Science and Technology, Krasnoyarsky Rabochy Ave. 31, Krasnoyarsk, 660037, Russian Federation
Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Ak. Lavrentieva 5, Novosibirsk, 630090, Russian Federation

Доп.точки доступа:
Nizovtseva, P. V.; Martyanov, O. N.; Морозов, Евгений Владимирович
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Dynamics of asphaltene aggregates under high-pressure CO2 revealed by pulsed-field gradient NMR / E. V. Morozov, S. N. Trukhan, I. V. Kozhevnikov [et al.] // Energy & Fuels. - 2023. - Vol. 37, Is. 22. - P. 17215-17226, DOI 10.1021/acs.energyfuels.3c02862. - Cited References: 90. - The present research was performed with the financial support of the Russian Science Foundation (project no. 21-13-00171, http://rscf.ru/project/21-13-00171/) using the equipment of the Krasnoyarsk Regional Center of Research Equipment of the Federal Research Center “Krasnoyarsk Science Center SB RAS” . - ISSN 0887-0624. - ISSN 1520-5029
Аннотация: The work demonstrates the results of the first experimental PFG NMR study in situ of the complex phase behavior of asphaltenes in the presence of high-pressure CO2. To perform the experiments, a series of sealed, thick-walled quartz capillaries were prepared with a mixture of CO2 and asphaltenes dissolved either in chloroform or benzene at different initial concentrations. Then, the temperature dependence of the diffusion coefficients of the asphaltene aggregates was measured for each sample after the mixture reached its equilibrium state, at which, in accordance with the solubility limit, only part of the initial asphaltenes remained dissolved. Despite quite low residual asphaltene concentrations in solution, experimental data clearly demonstrated the presence of aggregated structures (up to 70–80 wt %) attributed solely to nanoaggregates, with no signs of the presence of macroaggregates in the samples. Temperature dependencies of aggregate diffusivity clearly showed that the scenario, according to which the evolution of the asphaltene aggregates will develop, strongly depends on the initial asphaltene concentration, mass fraction of CO2 loaded into the system, and chemical nature of the solvent used. In particular, the most diluted asphaltene solution, expected to be the most resistive to the aggregation processes in a high-pressure CO2 environment, revealed the most pronounced aggregation-dependent translational dynamics as compared to those with a moderate initial asphaltene concentration. Contrarily, the concentrated asphaltene solution may not show drastic aggregation processes if the mass fraction of the CO2 loaded will not appear to be so high. Finally, the experimental results provide evidence that the temperature-triggered structural transformation of asphaltene aggregates due to the noncovalent bond breakup is not hindered under high-pressure CO2, but instead becomes more emphasized. The results obtained shed new light on asphaltene aggregate dynamics and brought new knowledge about the fundamental behavior of asphaltene in high-pressure CO2 conditions.

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Держатели документа:
Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, Akademgorodok 50/24, Krasnoyarsk 660036, Russia
Kirensky Institute of Physics, Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, Akademgorodok 50/38, Krasnoyarsk 660036, Russia
Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, Akademgorodok 50, Krasnoyarsk 660036, Russia
Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Ak. Lavrentieva 5, Novosibirsk 630090, Russia

Доп.точки доступа:
Morozov, E. V.; Морозов, Евгений Владимирович; Trukhan, Sergey N.; Kozhevnikov, Ivan V.; Peterson, Ivan V.; Martyanov, Oleg N.
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