Decomposition kinetics and recycle of binary hydrogen-tetrahydrofuran clathrate hydrate

Authors

  • Hiroki Yoshioka,

    1. Research Center of Supercritical Fluid Technology, Tohoku University, Aramaki Aza, Aoba-ku, Sendai 980-8579, Japan
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  • Masaki Ota,

    1. Research Center of Supercritical Fluid Technology, Tohoku University, Aramaki Aza, Aoba-ku, Sendai 980-8579, Japan
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  • Yoshiyuki Sato,

    1. Research Center of Supercritical Fluid Technology, Tohoku University, Aramaki Aza, Aoba-ku, Sendai 980-8579, Japan
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  • Masaru Watanabe,

    1. Research Center of Supercritical Fluid Technology, Tohoku University, Aramaki Aza, Aoba-ku, Sendai 980-8579, Japan
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  • Hiroshi Inomata,

    1. Research Center of Supercritical Fluid Technology, Tohoku University, Aramaki Aza, Aoba-ku, Sendai 980-8579, Japan
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  • Richard L. Smith Jr.,

    Corresponding author
    1. Research Center of Supercritical Fluid Technology, Tohoku University, Aramaki Aza, Aoba-ku, Sendai 980-8579, Japan
    • Research Center of Supercritical Fluid Technology, Tohoku University, Aramaki Aza, Aoba-ku, Sendai 980-8579, Japan
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  • Cor J. Peters

    1. Laboratory of Process Equipment, Dept. of Process and Energy, Faculty of Mechanical, Maritime and Materials Engineering, Delft University of Technology, 2628 CA Delft, The Netherlands
    2. Petroleum Institute, Chemical Engineering Program, Abu Dhabi, United Arab Emirates
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Abstract

Decomposition kinetics and recycle of hydrogen–tetrahydrofuran (H2–THF) clathrate hydrates were investigated with a pressure decay method at temperatures from 265.1 to 273.2 K, at initial pressures from 3.1 to 8.0 MPa, and at stoichiometric THF hydrate concentrations for particle sizes between 250 and 1000 μm. The decomposition was modeled as a two-step process consisting of H2 diffusion in the hydrate phase and desorption from the hydrate cage. The adsorption process occurred at roughly two to three times faster than the desorption process, whereas the diffusion process during formation was slightly higher (ca. 20%) than that during decomposition. Successive formation and decomposition cycles showed that occupancy seemed to decrease only slightly with cycling and that there were no large changes in hydrate structure due to cycling. Results provide evidence that the formation and decomposition of H2 clathrate hydrates occur reversibly and that H2 clathrate hydrates can be recycled with pressure. © 2010 American Institute of Chemical Engineers AIChE J, 2011

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