https://dspace.kpfu.ru/xmlui/handle/net/6048 2026-09-29T01:04:18Z https://dspace.kpfu.ru/xmlui/handle/net/186144 Study of Heavy Crude Oil Upgrading in Supercritical Water Using Diverse Kinetic Approaches Tirado Kota Aleksis; Felix Lugo Jose Guillermo; Chzhou Syaodun; Varfolomeev Mikhail Alekseevich; Ancheyta Juarez Jorge Heavy crude oil upgrading under a supercritical water environment has demonstrated to have diverse advantages. For commercial applications, it is necessary to develop mathematical models that can predict the reactive behavior of the different components of crude oil under these operating conditions. However, the consideration of different experimental and modeling approaches can significantly influence the determination and evaluation of reaction rates, which complicates providing essential insights into the reaction system and thus generates numerical simulations and strategies that allow for increasing the efficiency of these processes. Therefore, this study analyzes the effect of the supercritical water atmosphere on the diverse reactions among oil components as well as different kinetic modeling approaches reported in the literature to predict the yields of reactive compounds. Complex kinetic models were developed using proposed reaction schemes and experimental data obtained during the upgrading of heavy crude oil under supercritical water conditions. The predictions with the models show good agreement concerning the experimental data. In addition, it was shown that the conversion of asphaltenes to resins and gas compounds under supercritical conditions presents a significant increase in reaction rates compared with experiments under non-catalytic and catalytic thermal cracking conditions. 2024-01-01T00:00:00Z https://dspace.kpfu.ru/xmlui/handle/net/186143 Kinetic model for Boca de Jaruco heavy crude oil catalytic aquathermolysis using NiSO4 catalyst Felix Lugo Jose Guillermo; Tirado Kota Aleksis; Varfolomeev Mikhail Alekseevich; Suwaid Muneer; Al-Muntaser Ameen Ahmed; Mukhamatdinov Irek Izailovich; Sitnov Sergey Andreevich; Vakhin Aleksey Vladimirovich; Kudryashov Sergey I.; Ancheyta Juarez Jorge In recent times, water-soluble catalysts have exhibited good results for reducing the viscosity during the catalytic aquathermolysis of heavy oils, being a good alternative to enhance steam injection technologies. Nonetheless, currently there is no kinetic model with these types of catalysts for such reaction. This work reports the development of a kinetic model based on SARA fractions for the aquathermolysis of Boca de Jaruco heavy oil using NiSO4 as water-soluble catalyst. Asphaltenes conversion into smaller fractions prevails as the easiest reaction at catalytic aquathermolysis conditions followed by the condensation reactions of SARA fractions (saturates - aromatics - resins - asphaltenes). This complex fraction is also the main producer of gases since their generation from other fractions is less likely to be carried out. The kinetic parameters were correctly estimated and their optimal values were confirmed based on sensitivity and statistical analyses. The accuracy of experimental data prediction was demonstrated with 6.9 % of average absolute error. It was concluded that the water-soluble catalyst promotes the conversion of asphaltenes and hinders the over-cracking reactions of light fractions. 2024-01-01T00:00:00Z https://dspace.kpfu.ru/xmlui/handle/net/186142 Kinetics of Non-Catalytic Aquathermolysis of Heavy Crude Oil in the Presence of a Hydrogen Donor Tirado Kota Aleksis; Felix Lugo Jose Guillermo; Al-Muntaser Ameen Ahmed; Suwaid Muneer; Varfolomeev Mikhail Alekseevich; Ancheyta Juarez Jorge The research for increasing the performance of novel technologies for the production and upgrading of heavy crude oil reserves through the development and selection of adequate catalyst precursors and hydrogen donors has been raised to address the growing energy demand. Studies based on complex kinetic models are required to achieve a better understanding of the effect of hydrogen donors and their reaction mechanisms for the aquathermolysis of heavy crude oil. In this study, the kinetic effect of decalin as a hydrogen donor on aquathermolysis of heavy crude oil was analyzed under a temperature range of 250-300 ?C, a water/oil ratio of 3:7, and reaction periods of up to 72 h. A five-lump kinetic model was developed to study the reaction behavior of the SARA fractions and gas production, where the calculated kinetic parameters provided an adequate agreement with average absolute error values lower than 5% concerning experimental data. The model results indicated that in experiments in the presence of decalin, the conversion of asphaltenes presents a higher selectivity toward resins and aromatic compounds. On the other hand, the formation of secondary asphaltenes produced from resins is inhibited, showing an improvement in the selectivity of aromatic compounds from this fraction. 2024-01-01T00:00:00Z https://dspace.kpfu.ru/xmlui/handle/net/186141 Comparison of Traditional and Sequential Approaches for Estimation of Kinetic Parameters of Heavy Oil Upgrading Felix Lugo Jose Guillermo; Tirado Kota Aleksis; Varfolomeev Mikhail Alekseevich; Soto-Robles Carlos A.; Lugo-Medina Eder; Ancheyta Juarez Jorge During the kinetic modeling of reactions with complex feeds, the proposal of reaction schemes is a crucial step, especially when the number of pathways considered is high, since it influences the estimation of kinetic parameters. In this work, the complexity of the reaction scheme and the methodology followed for the estimation of parameters of the kinetic models for heavy oil upgrading were studied. Experimental data reported in the literature for the aquathermolysis of Xinjiang heavy oil were employed. The obtained kinetic parameters exhibited predictions that were more accurate than those reported in the original work. The number of pathways considered in the reaction scheme and the obtained kinetic parameters do not significantly affect the accuracy of the model, but different main reaction routes of SARA and gas fractions were derived. The most appropriate reaction scheme was that obtained with more pathways and a sequential parameter estimation approach. The results showed that the main reactions are in series (asphaltenes ↔ resins ↔ aromatics), and asphaltenes are the main generator for all gas compounds. Being resins the fraction with higher conversion (25.41%) even higher than asphaltenes (14.15%), CO2 and H2 exhibited the highest production among all gases. The methodology employed for the estimation of parameters considerably influences the accuracy of the kinetic model. The sequential approach exhibited lower average absolute error values than the traditional method for all of the lumps, especially for resins and aromatics. 2024-01-01T00:00:00Z