S-I thermochemical cycle: A thermodynamic analysis of the HI-H

M. Lanchi, A. Ceroli, R. Liberatore, L. Marrelli, M. Maschietti, A. Spadoni, P. Tarquini

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It is widely agreed that the most energy consuming part of the Sulphur-Iodine (S-I) thermochemical cycle for hydrogen production is represented by separation processes, especially for the HI decomposition section (HIxsection). Therefore, the assessment of the real potential of the S-I cycle requires an optimization of the separation sections and, hence, a deep knowledge of the thermodynamic behaviour of the systems to be separated. In this paper, a new thermodynamic model for the electrolyte system HI-H2O-I2is proposed and validated on vapour-liquid (V-L) equilibrium data at atmospheric pressure. The model provides a reliable description of the phase equilibria of the ternary system and is applied for the flow-sheeting of the HIxsection at atmospheric pressure along with the energy assessment of the proposed scheme. © 2008 International Association for Hydrogen Energy.
Original languageEnglish
Pages (from-to)2121 - 2132
Number of pages12
JournalInternational Journal of Hydrogen Energy
Issue number5
Publication statusPublished - Mar 2009


All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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