Clathrate-hydrate formation from a hydrocarbon gas mixture: Compositional evolution of formed hydrate during an isobaric semi-batch hydrate-forming operation

Wataru Kondo, Kaoru Ohtsuka, Ryo Ohmura, Satoshi Takeya, Yasuhiko H. Mori

研究成果: Article査読

47 被引用数 (Scopus)

抄録

The clathrate hydrate formation from a model natural gas, i.e., a mixture of methane, ethane, and propane in a 90:7:3. molar ratio, under a constant pressure was experimentally investigated, focusing on the compositional evolution of hydrate crystals formed inside a gas-bubbling-type reactor during each semi-batch hydrate-forming operation. The experimental system used in this study was specially designed for obtaining several hydrate samples formed at different, arbitrarily selected stages during each hydrate-forming operation. Each hydrate sample was analyzed by a gas-chromatograph to determine the mole fractions of methane, ethane and propane encaged in the hydrate. These analyses revealed a monotonic increase in the methane fraction and decreases in the ethane and propane fractions during each operation until a quasi-steady state was established. Powder X-ray diffraction analyses showed that both structure-I and structure-II crystals were simultaneously formed during the quasi-steady period. The compositional evolution of the hydrates formed during the early stages before the quasi-steady state was reached deviated from corresponding predictions based on the thermodynamic-simulation scheme previously reported. A hypothetical explanation for the discrepancy between the experimental and simulation-based results was provided.

本文言語English
ページ(範囲)864-871
ページ数8
ジャーナルApplied Energy
113
DOI
出版ステータスPublished - 2014 1月

ASJC Scopus subject areas

  • 建築および建設
  • エネルギー(全般)
  • 機械工学
  • 管理、モニタリング、政策と法律

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