Changes in the subfractional composition of heavy oil asphaltenes under aquathermolysis with oil-soluble CO-based catalyst

Mukhamatdinov, Irek I.; Salih, I. Sh. S.; Vakhin, Аlexey V.

doi:10.1080/10916466.2019.1594287

Cited by 17 publications

(6 citation statements)

References 24 publications

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“…One of the main issues known about the combustion front is the lack of stability and an earlier breakthrough even in the early stages of the process . Moreover, few pilot tests have been successfully applied since its first invention in the beginning of the last century. − To solve this problem, most studies have tended to focus on the application of transition-metal catalysts because they are widely used in petroleum industry, in addition to their particular electrical, physical, and chemical properties. − The catalysts used for enhancing heavy-oil recovery are generally classified as water soluble; oil soluble; amphiphilic; minerals; and zeolites, solid superacids, and dispersed nanoparticles. − Oil-soluble catalysts showed significant efficiency in different works. For example, in the work of Ramirez-Garnica et al, organometallic precursors of iron-, nickel-, molybdenum-, and cobalt-containing catalysts were used in the combustion of Gulf-Mexican heavy oil using combustion tubes.…”

Section: Introductionmentioning

confidence: 99%

Impact of Iron Tallate on the Kinetic Behavior of the Oxidation Process of Heavy Oils

et al. 2019

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Oxidation of heavy and extra-heavy oils is recognized as a complicated process due to the heterogeneous nature of its reaction medium and the lack of knowledge concerning its reaction mechanisms. The next decade is likely to witness a considerable rise in the use of in situ combustion to extract heavy and extra-heavy oils. However, a major issue of the in situ combustion is the instability of the combustion front. For this reason, application of catalysts was viewed as a way to initiate the process early and stabilize the resultant combustion front. In this study, we have synthesized an efficient precursor of ironcontaining catalyst, studied its effect on heavy-oil oxidation by estimating the heat-flow-rate changes occurring during the oxidation process as a function of heating at different rates using differential scanning calorimetry, and investigated its transformation throughout the oxidation process by estimating its mass loss with heating at the rate of 10 °C min −1 using thermogravimetric analysis. In addition, we studied the morphology and size of the final product of oxidation obtained at 500 °C using scanning electron microscopy. At the end of the study, we compared its effect to that of the previously studied manganese tallate on heavy-oil oxidation. The kinetic parameters of the processes have been obtained by means of applying Kissinger method (isoconversional principle). Interestingly, iron tallate has been found to decrease the activation energy of both low-temperature and high-temperature oxidation regions. In addition, the values of effective reaction rate constants of both regions (low-temperature oxidation and high-temperature oxidation) increased in the presence of iron tallate as well. Moreover, it has been suggested that the iron oxide nanoparticles formed in situ are responsible for the resulting catalytic effect.

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Section: Introductionmentioning

confidence: 99%

Impact of Iron Tallate on the Kinetic Behavior of the Oxidation Process of Heavy Oils

et al. 2019

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“…the presence of a hydrogen donor, the viscosity of heavy oil after the reaction does not increase [24]. The method of fractionation of complex mixtures of high molecular mass compounds has been widely used for a long time [27].This method is intended for the separation of multicomponent mixtures into narrow fractions with a homogeneous composition to reveal the physicochemical characteristics and their differences [28].…”

Section: Resultsmentioning

confidence: 99%

Transformation of Resinous Components of the Ashalcha Field Oil during Catalytic Aquathermolysis in the Presence of a Cobalt-Containing Catalyst Precursor

et al. 2021

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The aim of this work was to study the fractional composition of super-viscous oil resins from the Ashalcha field, as well as the catalytic aquathermolysis product in the presence of a cobalt-containing catalyst precursor and a hydrogen donor. The study was conducted at various durations of thermal steam exposure. In this regard, the work enabled the identification of the distribution of resin fractions. These fractions, obtained by liquid adsorption chromatography, were extracted with individual solvents and their binary mixtures in various ratios. The results of MALDI spectroscopy revealed a decrease in the molecular mass of all resin fractions after catalytic treatment, mainly with a hydrogen donor. However, the elemental analysis data indicated a decrease in the H/C ratio for resin fractions as a result of removing alkyl substituents in resins and asphaltenes. Moreover, the data of 1H NMR spectroscopy of resin fractions indicated an increase in the aliphatic hydrogen index during catalytic aquathermolysis at the high molecular parts of the resins R3 and R4. Finally, a structural group analysis was carried out in this study, and hypothetical structures of the initial oil resin molecules and aquathermolysis products were constructed as well.

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“…52 Analysis of subfractions of asphaltenes is a method to provide detailed insight into the structure and composition of these high-molecular components and attain a better understanding of the average molecular mass. Mukhamatdinov et al 53,54 investigated the chemical changes in the structure of asphaltene subfractions of Ashal'cha heavy crude oil under the influence of an oil-soluble Co-based catalyst at 250 °C. The initial and upgraded oil samples were divided into fractions of maltenes, five asphaltene subfractions (A1−A5), and an insoluble carbenes−carboids subfraction using different solvents and proportions.…”

Section: Average Molecular Weightmentioning

confidence: 99%

Molecular Asphaltene Transformations during Aquathermolysis of Heavy Crude Oil: Analysis of the Literature Data

Tirado,

Félix,

Al-Muntaser

et al. 2023

Energy Fuels

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Despite the remarkable effort performed to understand the reaction mechanism of asphaltenes during aquathermolysis reaction, the knowledge level about their molecular structures and reaction pathways is still limited. This work thoroughly reviews and discusses experimental results reported from different samples of asphaltenes during the aquathermolysis reaction to obtain information about the elemental composition, functional groups, and average structural parameters using analytical characterization techniques, including elemental analysis, Fourier transform infrared spectroscopy, synchronous fluorescence spectroscopy, X-ray diffraction analysis, electron paramagnetic resonance spectroscopy, and nuclear magnetic resonance spectroscopy. By studying the structural changes of asphaltenes, theoretical support is provided for future research on the aquathermolysis of heavy crude oils in the presence and absence of various catalysts such as water-soluble, ionic liquids-based, mineral, and heterogeneous. Characterization analyses show that the changes in asphaltenes are strongly influenced by the operating conditions, catalyst type, and asphaltene structure. Certain catalysts and hydrogen donors provide a higher effect on asphaltenes and their functional groups that have been observed through changes in the molecular weight, aromaticity, and condensation as well as representative parameters of the aggregation state of asphaltene molecules.

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Changes in the subfractional composition of heavy oil asphaltenes under aquathermolysis with oil-soluble CO-based catalyst

Cited by 17 publications

References 24 publications

Impact of Iron Tallate on the Kinetic Behavior of the Oxidation Process of Heavy Oils

Impact of Iron Tallate on the Kinetic Behavior of the Oxidation Process of Heavy Oils

Transformation of Resinous Components of the Ashalcha Field Oil during Catalytic Aquathermolysis in the Presence of a Cobalt-Containing Catalyst Precursor

Molecular Asphaltene Transformations during Aquathermolysis of Heavy Crude Oil: Analysis of the Literature Data

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