Dissolution mechanism of liquid CO2 with hydrate film at the interface in high pressurized water and its thermodynamic consideration

Yutaka Tabe, Shuichiro Hirai, Ken Okazaki, Katsuyuki Kawamura, Kunio Hijikata

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Dissolution of liquid CO2 accompanied by CO2 clathrate-hydrate film into sea water is observed at CO2 sequestration in ocean, which is considered to be an effective strategy of CO2 mitigation. The dissolution mechanism was experimentally investigated by considering the relation between measured CO2 surface concentration of hydrate-covered C02 droplets and C02 solubility. It was made clear that, in the temperature range of hydrate formation, the measured surface concentration decreases with the decrease of temperature and it exactly corresponds to CO2 solubility. This fact indicates that the dissolution rate of a CO2 droplet with hydrate film is controlled by the mass transfer rate of dissolved CO2 at the droplet surface into water and the decrease of dissolution rate is caused by the decrease of CO2 solubility in the hydrate formation region. Further, in order to clarify the decreasing mechanism of CO2 solubility, a thermodynamic method was employed. CO2 solubility was estimated from the relationship between the molar Gibbs free energy of water-liquid CO 2 mixture and that of hydrate and it has shown that the present method could predict the decrease of CO2 solubility in hydrate formation region fairly well.

Original languageEnglish
Pages (from-to)2189-2195
Number of pages7
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume64
Issue number623
DOIs
Publication statusPublished - Jul 1998

Keywords

  • CO Sequestration in Ocean
  • Clathrate-hydrate
  • Dissolution rate
  • Environmental Engineering
  • Global Warming
  • Mass transfer
  • Solubility
  • Thermodynamics

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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