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Arabian Journal for Science and Engineering

, Volume 43, Issue 11, pp 5733–5743 | Cite as

Modeling and Kinetic Study of an Ebullated Bed Reactor in the H-Oil process

  • Mohammad F. AbidEmail author
  • Shakir M. Ahmed
  • Halah H. Hassan
  • Salah M. Ali
Research Article - Chemical Engineering

Abstract

The present work was devoted to investigate the kinetic behavior of an industrial-scale ebullated bed reactor, licensed by Axens Co., in Lukoil refinery at Bourgas, Bulgaria. Another objective of the present work is to formulate a steady state mathematical model to predict the profile of products along the reactor, and to investigate effects of the operating variables [e.g., operating temperature, weight hour space velocity (WHSV), and reaction time] on the kinetic parameters, and performance of the industrial ebullated bed reactor. A five-lump kinetic model was utilized to describe the catalytic hydrocracking of heavy oil and to formulate the reaction rate equations of the main components of heavy oil. The formulated model was validated by comparing its outcome with experimental measurements of fractions of VR, VGO, and N at the effluent of industrial reactor against residence time. Results revealed an opposite relationship of the effectiveness factor with both temperature and WHSV. Results showed that the activation and deactivation energies were approximately equal, indicating that catalyst deactivation has no appreciable effect on the hydrocracking reactions in the ebullated bed reactor. The hydrocracking reactions of vacuum residue to lower molecular weight components are preferentially obtained in the following descending order: VGO; middle distillates; naphtha; gases. WHSV has a negative effect on the yield of the industrial reactor while the trend was different with the operating temperature. Outcomes of the formulated model were compared with the data reported in the literature.

Keywords

Ebullated bed reactor Reaction pathways Mathematical model Heavy oil Hydroprocessing H-oil unit 

Abbreviations

\(C_\mathrm{s,i}\)

Concentration of component i on catalyst surface, kg kg-cat\(^{-1}\)

\(C_\mathrm{b,i}\)

Concentration of component i in the bulk, kg \(\hbox {m}^{-3}\)

\(D_\mathrm{c}\)

Reactor diameter, m

\(D_{\mathrm{e}}\)

Effective diffusivity, \(\hbox {m}^{2 }\,\hbox {s}^{-1}\)

\(E_\mathrm{A}\)

Apparent activation energy, kJ \( \hbox {mol}^{-1}\)

\(g_{\mathrm{i},0}\)

Content of fraction i in the feed flow rate, kg \(\hbox {s}^{-1}\).

\(g_\mathrm{i}\)

Content of the fraction i (gases, naphtha, middle distillates, or vacuum gas oil) in the product, \(\hbox {kg}\,\mathrm{s}^{-1}\)

\(g_{\mathrm{T,o}}\)

Total amount of reactants entering the reactor, kg  \(\hbox {s}^{-1}\)

\(k_\mathrm{c}\)

Fluid-particle mass transfer coefficient, m \(\hbox {s}^{-1}\)

\(k_\mathrm{d}\)

Deactivation rate constant, \(\hbox {s}^{-1}\)

\(k_\mathrm{o}\)

Overall constant of hydrocracking reaction, \(\hbox {s}^{-1}\)

\(k_\mathrm{i}\)

Reaction rate constant of i pathway, \(\hbox {s}^{-1}\)

I

Deactivation rate order

\(m^{\bullet }\)

Initial mass flow rate, kg \(\hbox {h}^{-1}\)

n

Order of reaction rate

\(r_\mathrm{s}\)

Radius of particle, m

\(r_\mathrm{i}\)

Reaction rate of the fraction i (gases, naphtha, middle distillates or vacuum gas oil) \(\hbox {kg}_{\mathrm{reacted}}\,\hbox {kg}^{-1}_{\mathrm{cat}}\) s

R

Universal gas constant (= 1.987), kcal mol\(^{-1}\) K

t

Time, h

T

Temperature, K

W

Weight of catalyst used, kg

Y

Total conversion

\(w_\mathrm{i}\)

Composition of component i in product

\(w_{i,o}\)

Initial composition of component i in feed

Greek letters

\(\lambda \)

Catalyst deactivation function

\(\xi \)

Catalyst effectiveness factor

\(\varepsilon \)

Thiele modulus

\(\sigma \)

Gas–liquid surface tension, kg \(\hbox {s}^{-2}\)

\(\gamma _{0}\)

Specific gravity

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Notes

Acknowledgements

The authors gratefully acknowledge the Petroleum Research and Development Center, Ministry of Oil, Iraq, in sponsoring the work (Grant Number {3721/15-8-2013}). Thanks are also due to the representatives of Axens Co., for their valuable assistance on the field of Lukoil refinery.

References

  1. 1.
    Tao, Y.: Research and development of strong ebullated bed residue hydrotreating technology. In: Proceedings of the 4th Japan–China–Korea Petroleum Technology Congress on Feb 22–24, Tokyo (2011)Google Scholar
  2. 2.
    Speight, J.G.: New approaches to hydroprocessing. Catal. Today 98, 55–60 (2004)CrossRefGoogle Scholar
  3. 3.
    Rana, M.S.; Ancheyta, J.; Dı’az, J.A.I.; Sa’mano, V.: A review of recent advances on process technologies for upgrading heavy oils and residua. Fuel 86, 1216–1231 (2007)CrossRefGoogle Scholar
  4. 4.
    Liu, Y. ; Gao, L.; Wen, L.; Zong, B.: Recent advances in heavy oil hydroprocessing technologies. Recent Pat. Chem. Eng. 2, 22–36 (2009)CrossRefGoogle Scholar
  5. 5.
    Kressmann, S.; Boyer, C.; Colyar, J.J.; Schweitzer, J.M.; Viguiè, J.C.: Improvements of ebullated-bed technology for upgrading heavy oils. Oil Gas Sci. Technol. Rev. IFP 55(4), 397–406 (2000)CrossRefGoogle Scholar
  6. 6.
    Ancheyta, J.; Sa’ncheza, S.; Rodrı’guez, M.A.: Kinetic modeling of hydrocracking of heavy oil fractions: a review. Catal. Today 109, 76–92 (2005)CrossRefGoogle Scholar
  7. 7.
    Qader, S.A.; Hill, G.R.: Hydrocracking of gas oil. Ind. Eng. Chem. Process Des. Dev. 8(1), 98–105 (1969)CrossRefGoogle Scholar
  8. 8.
    Callejas, M.A.; Martinez, M.T.: Hydrocracking of a Maya residue. Kinetics and product yield distributions. Ind. Eng. Chem. Res. 38, 3285–3289 (1999)CrossRefGoogle Scholar
  9. 9.
    Sanchez, S.; Rodriguez, M.A.; Ancheyta, J.: Kinetic model for moderate hydrocracking of heavy oils. Ind. Eng. Chem. Res. 44(25), 9409–9413 (2005)CrossRefGoogle Scholar
  10. 10.
    Ancheyta, J.: Modeling of Processes and Reactors for Upgrading of Heavy Petroleum. CRC Press, Boca Raton (2013)CrossRefGoogle Scholar
  11. 11.
    Malladi, M.; Otero-Schipper, P.H.; Gross, B.: Dynamics of ebullated bed reactor following recycle failure. In: American Institute of Chemical Engineers 1982 Fall Meeting, Los Angeles, CA (1982)Google Scholar
  12. 12.
    Matos, E.M.; Guirardello, R.: Modeling and simulation of the hydrocracking of heavy oil fractions. Braz. J. Chem. Eng. 17, 79–90 (2000)CrossRefGoogle Scholar
  13. 13.
    Froment, G.F.; Bischoff, K.B.; De Wilde, J.: Chemical Reactor Analysis and Design, 3rd edn. Wiley, New York (2010)Google Scholar
  14. 14.
    Nalitham, R.V.; Guin, J.A.; Tarrer, A.R.; Curtis, C.W.: Effect of phase behavior on hydrotreater performance: simulation and experimental verification. Ind. Eng. Chem. Proc. Des. Dev. 24, 598–607 (1985)CrossRefGoogle Scholar
  15. 15.
    Muroyama, K.; Fan, L.S.: Fundamentals of gas–liquid–solid fluidization. AIChE J. 31, 1 (1985)CrossRefGoogle Scholar
  16. 16.
    Li, A.; Lin, D.: Scaleup performance and thermal stability analysis of H-oil and H-coal ebullated-bed reactors. In: AIChE Meeting, New Orleans, Louisiana, 8–11 Nov (1981)Google Scholar
  17. 17.
    Levenspiel, O.: Reactions Catalyzed by Solids, Chemical Reaction Engineering, 3rd edn. Wiley, Hoboken (1999)Google Scholar
  18. 18.
    Charles, G.; Hill, J.R.: An Introduction to Chemical Engineering Kinetics and Reactor Design. Wiley, Hoboken (1977)Google Scholar
  19. 19.
    Company, Axens: H-oil process. In: Axens, Operation Training Program, Lukoil Refinery (2014)Google Scholar
  20. 20.
    Sa’nchez, S.; Ancheyta, J.: Effect of pressure on the kinetics of moderate hydrocracking of Maya crude oil. Energy Fuels 21, 653–661 (2007)CrossRefGoogle Scholar
  21. 21.
    Bennett, R.N.; Bourne, K.H.: In: Proceedings of the ACS symposium on advances in distillate and residual oil technology, New York (1972)Google Scholar

Copyright information

© King Fahd University of Petroleum & Minerals 2017

Authors and Affiliations

  • Mohammad F. Abid
    • 1
    Email author
  • Shakir M. Ahmed
    • 2
  • Halah H. Hassan
    • 2
  • Salah M. Ali
    • 3
  1. 1.Department of Chemical EngineeringUniversity of TechnologyBaghdadIraq
  2. 2.SCOPMinistry of OilBaghdadIraq
  3. 3.Petroleum Research and Development CenterMinistry of OilBaghdadIraq

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