Study on reaction equations of heavy oil aquathermolysis with superheated steam

Huang, Shijun; Cao, Meng; Huang, Qian; Liu, B.; Jiang, Jun

doi:10.1007/s13762-018-1799-3

Cited by 18 publications

(9 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Asphaltenes and aromatics exhibited similar values of reaction rate coefficients for the generation of H 2 and CO 2 , which may indicate a high content of oxygenated and saturated compounds in these fractions that can undergo deoxygenation and dehydrogenation reactions. Among these oxygenated compounds, petroleum acids, sulfoxides, mono- and dioxygenated are the main producers of CO 2 by decarboxylation reactions. , However, the content of this gas is partly attributed to these reactions since it also comes from the cleavage of C–S bonds, which is a source of CO, and afterward CO 2 through WGSR. ,,, Although CO was not reported, which agrees with other aquathermolysis studies, ,,,, it is believed that all CO produced reacts with the high amount of H 2 O by WGSR to produce CO 2 and H 2 . This is because the generation of CO 2 has shown an increasing correlation with the increase of water content at aquathermolysis conditions, promoting hydrogen production .…”

Section: Resultssupporting

confidence: 66%

“…36,68 However, the content of this gas is partly attributed to these reactions since it also comes from the cleavage of C−S bonds, which is a source of CO, and afterward CO 2 through WGSR. 7,36,46,68 Although CO was not reported, which agrees with other aquathermolysis studies, 23,24,55,69,70 it is believed that all CO produced reacts with the high amount of H 2 O by WGSR to produce CO 2 and H 2 . This is because the generation of CO 2 has shown an increasing correlation with the increase of water content at aquathermolysis conditions, promoting hydrogen production.…”

Section: Estimated Kinetic Model With 29supporting

confidence: 81%

“…In consequence, the obtained activation energies for the reactions between lumps represent the average value of individual activation energies for the transformation of each molecule. Therefore, the dependence on temperature may not be representative of the same reactions at other temperature ranges. , It should be noted that sometimes this average activation energy does not represent the distribution of activation energies of the diverse reactions that the proposed reaction route includes. When this issue arises, it is not possible to calculate the kinetic parameters in a temperature range out of that employed for generating the kinetics.…”

Section: Final Commentsmentioning

confidence: 99%

See 2 more Smart Citations

Comparison of Traditional and Sequential Approaches for Estimation of Kinetic Parameters of Heavy Oil Upgrading

Félix,

Tirado,

Varfolomeev

et al. 2024

Energy Fuels

View full text Add to dashboard Cite

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%), CO 2 and H 2 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.

show abstract

Section: Resultssupporting

confidence: 66%

Section: Estimated Kinetic Model With 29supporting

confidence: 81%

Section: Final Commentsmentioning

confidence: 99%

See 1 more Smart Citation

Comparison of Traditional and Sequential Approaches for Estimation of Kinetic Parameters of Heavy Oil Upgrading

Félix,

Tirado,

Varfolomeev

et al. 2024

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…For experiments in the presence of decalin in the reaction system at 300 °C and 24 h, the yield of H 2 was increased up to 0.187 wt % compared with 0.0034 wt % for experiments without a hydrogen donor. 21,35,36 Similarly, CO 2 production was increased using decalin from 0.0881 to 0.2509 wt %, which can be attributed to the presence of the water−gas shift reaction. However, CO was not detected in the reaction gases.…”

Section: Resultsmentioning

confidence: 91%

Kinetics of Non-Catalytic Aquathermolysis of Heavy Crude Oil in the Presence of a Hydrogen Donor

Tirado,

Félix,

Al-Muntaser

et al. 2024

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

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 fivelump 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.

show abstract

“…A series of complex chemical reactions occurred, such as the rupture of the C−S bond, hydrolysis, elimination reaction, isomerization, aromatization, condensation, addition reaction, hydrodesulfurization, dehydrogenation, and cyclization of alkanes, and water−gas shift reaction (WGSR), thus various kinds of complex gas-phase and liquid-phase products were generated. Based on the theory of aquathermolysis reaction, 18 reaction pathways for tetrahydrothiophene aquathermolysis was described, as shown in Figure 2.…”

Section: Resultsmentioning

confidence: 99%

Reaction Mechanism of H₂S Generation during Tetrahydrothiophene Aquathermolysis Reaction

et al. 2020

View full text Add to dashboard Cite

The generation of H2S causes many problems during steam injection thermal recovery. To make clear the formation rule of H2S under the condition of steam injection thermal recovery, tetrahydrothiophene was selected as a model compound, and then reaction mechanism and kinetics were explored based on indoor thermal simulation. The results showed that tetrahydrothiophene aquathermolysis reaction can generate a large amount of H2S. The C–S bond formed by heteroatom S broke at first and then opening-ring occurred, which produced small molecular alkanes or alkenes. The decarbonylation of aldehydes and other organic compounds resulted in the formation of CO, hydrocarbons, and other related compounds. High-temperature water played a key role in the process of tetrahydrothiophene aquathermolysis reaction and would directly participate in the elementary reactions such as hydrolysis and water–gas shift reaction (WGSR). These elementary reactions would finally lead to the migration of hydrogen from water to gas-phase or liquid-phase products. In addition, a kinetic model of H2S formation during tetrahydrothiophene aquathermolysis reaction was established through kinetic experiments, the activation energy is 54.55 kJ/mol, and the frequency factor is 166.47 day–1.

show abstract

Study on reaction equations of heavy oil aquathermolysis with superheated steam

Cited by 18 publications

References 11 publications

Comparison of Traditional and Sequential Approaches for Estimation of Kinetic Parameters of Heavy Oil Upgrading

Comparison of Traditional and Sequential Approaches for Estimation of Kinetic Parameters of Heavy Oil Upgrading

Kinetics of Non-Catalytic Aquathermolysis of Heavy Crude Oil in the Presence of a Hydrogen Donor

Reaction Mechanism of H₂S Generation during Tetrahydrothiophene Aquathermolysis Reaction

Contact Info

Product

Resources

About

Study on reaction equations of heavy oil aquathermolysis with superheated steam

Cited by 18 publications

References 11 publications

Comparison of Traditional and Sequential Approaches for Estimation of Kinetic Parameters of Heavy Oil Upgrading

Comparison of Traditional and Sequential Approaches for Estimation of Kinetic Parameters of Heavy Oil Upgrading

Kinetics of Non-Catalytic Aquathermolysis of Heavy Crude Oil in the Presence of a Hydrogen Donor

Reaction Mechanism of H2S Generation during Tetrahydrothiophene Aquathermolysis Reaction

Contact Info

Product

Resources

About

Reaction Mechanism of H₂S Generation during Tetrahydrothiophene Aquathermolysis Reaction