Journal of Applied Electrochemistry

, Volume 24, Issue 11, pp 1092–1101 | Cite as

Electrochemical polishing of hydrogen sulfide from coal synthesis gas

  • S. R. Alexander
  • J. Winnick
Papers
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Revised:

Abstract

An advanced process has been developed for the separation of H2S from coal gasification product streams through an electrochemical membrane. This technology is developed for use in coal gasification facilities providing fuel for cogeneration coal fired electrical power facilities and molten carbonate fuel cell (MCFC) electrical power facilities. H2S is removed from the syn-gas by reduction to the sulfide ion and hydrogen gas at the cathode. The sulfide ion migrates to the anode through a molten salt electrolyte suspended in an inert ceramic matrix. Once at the anode it is oxidized to elemental sulfur and swept away for condensation in an inert gas stream. The syn-gas is enriched with the hydrogen. Order of magnitude reductions in H2S have been repeatedly recorded (100 ppm to 10 ppm H2S) on a single pass through the cell. This process allows removal of H2S without cooling the gas stream and with negligible pressure loss through the separator. Since there are no absorbents used, there is no absorption/regeneration step as with conventional technology. Elemental sulfur is produced as a byproduct directly, so there is no need for a Claus process for sulfur recovery. This makes the process economically attractive since it is much less equipment intensive than conventional technology.

Keywords

Hydrogen Sulfide Cogeneration Coal Gasification Conventional Technology Electrochemical Polishing 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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References

  1. [1]
    J. Winnick, ‘Advances in Electrochemical Science and Engineering’, Vol. 1 (edited by H. Gerischer and C. Tobias), VCH Publishers, Weinheim (1990) p. 205.Google Scholar
  2. [2]
    H. Lim and J. Winnick, J. Electrochem. Soc. 131 (1984) 562.Google Scholar
  3. [3]
    D. Weaver and J. Winnick, ibid. 139 (1992) 492.Google Scholar
  4. [4]
    S. Alexander and J. Winnick, AIChE J., 40 (1994) 613.Google Scholar
  5. [5]
    D. McHenry and J. Winnick, ibid., 40 (1994) 143.Google Scholar
  6. [6]
    R. Probstein and R. Hicks, ‘Synthetic Fuels’, McGraw-Hill, New York (1982) p. 124.Google Scholar
  7. [7]
    A. More, ‘Sulfur, Sulfur Dioxide, and Sulfuric Acid’, Verlag Chemie International Inc., Deerfield Beach, FL (1984) p. 30.Google Scholar
  8. [8]
    US Department of Energy, ‘Fuel Cells: A Handbook’, DOE/METC-88/6090, Morgantown, WV (1988) p. 8.Google Scholar
  9. [9]
    E. Banks and J. Winnick, J. Appl. Electrochem. 16 (1986) 583.Google Scholar
  10. [10]
    K. White and J. Winnick, Electrochem. Acta 30 (1985) 511.Google Scholar
  11. [11]
    S. Alexander and J. Winnick, J. Sep'n Sci. Tech. 25 (1990) 2057.Google Scholar
  12. [12]
    D. Weaver and J. Winnick, J. Electrochem. Soc. 134 (1987) 2451.Google Scholar
  13. [13]
    Idem, ibid. 136 (1989) 1679.Google Scholar
  14. [14]
    Oak Ridge National Laboratory, ORNL-5425, ‘Coal Gasification Processes: Energy Technology Review No. 70’, Noyes Data Corp., Park Ridge, NJ (1981) p. 290.Google Scholar
  15. [15]
    Marshall and Swift Publ., Co., Chem. Eng. 94(4) (1987) 7.Google Scholar
  16. [16]
    D. Townley and J. Winnick, IEC Proc. Des. 20 (1981) 435.Google Scholar
  17. [17]
    M. Kang and J. Winnick, J. Appl. Electrochem. 15 (1985) 431.Google Scholar
  18. [18]
    A. Appleby and F. Foulkes, ‘Fuel Cell Handbook’, Van Nostrand Reinhold, New York (1989) p. 574.Google Scholar
  19. [19]
    R. Petri and T. Benjamin, Proc. 21st Intersociety Energy Conversion Engineering Conference, Vol. 2, ACS, Washington, DC (1986) 1156.Google Scholar
  20. [20]
    R. Maddox, ‘Gas and Liquid Sweetening’, 2nd edn, Campbell Petroleum Series, Norman, OK (1977) p. 235.Google Scholar
  21. [21]
    Fluor Technology Inc., ‘Fluor Contract 842304’, personal communication with D. Borio, ABB/Combustion Engineering, Windsor, CT (1990).Google Scholar
  22. [22]
    F. Incropera and D. DeWitt, ‘Fundamentals of Heat and Mass Transfer’, 2nd edn, Wiley and Sons, New York (1985) p. 277.Google Scholar
  23. [23]
    G. Prentice, ‘Electrochemical Engineering Principles’, Prentice Hall, Englewood Cliffs, NJ (1991).Google Scholar

Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • S. R. Alexander
    • 1
  • J. Winnick
    • 1
  1. 1.School of Chemical EngineeringGeorgia Institute of TechnologyAtlantaUSA

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