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 journalArticle

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
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume64
Issue number623
Publication statusPublished - Jul 1998
Externally publishedYes

Fingerprint

Hydrates
hydrates
dissolving
Dissolution
Thermodynamics
solubility
Solubility
thermodynamics
Liquids
liquids
water
Water
sea water
clathrates
Gibbs free energy
surface water
Surface waters
mass transfer
oceans
Mass transfer

Keywords

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

ASJC Scopus subject areas

  • Mechanical Engineering
  • Condensed Matter Physics

Cite this

Dissolution mechanism of liquid CO2 with hydrate film at the interface in high pressurized water and its thermodynamic consideration. / Tabe, Yutaka; Hirai, Shuichiro; Okazaki, Ken; Kawamura, Katsuyuki; Hijikata, Kunio.

In: Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 64, No. 623, 07.1998, p. 2189-2195.

Research output: Contribution to journalArticle

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AU - Hirai, Shuichiro

AU - Okazaki, Ken

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AU - Hijikata, Kunio

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AB - 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.

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