Optical Interpretation of the Chemical Process of CH4-CO2 Exchange and Its Application to Gas Hydrate Production

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The guest-exchange method (or replacement) for methane production from gas hydrates has recently received attention because it can be used for both carbon dioxide sequestration and methane production. The structure of gas hydrates is maintained as a structure I (sI) hydrate while methane molecules are exchanged with carbon dioxide. In this study, CH4 + CO2 mixed gas hydrates were examined under terahertz light at various temperatures to simulate CH4-CO2 exchange reactions. Each gas hydrate composition examined was a representative composition at each step of the exchange reaction. The molecular composition was also accurately analyzed by gas chromatography. Refractive indices calculated by the terahertz time-domain spectroscopy (THz-TDS) of gas hydrate samples were correlated to the guest composition, and this novel method was proven to be used to quantify the extent of replacement via optical constant. Furthermore, changes in the water framework from the sI hydrate to ice using THz-TDS were investigated with an increasing temperature. Overall, this study reveals the process of guest exchange and phase transition from a gas hydrate to ice via the optical properties in the terahertz region, and it offers a powerful tool in gas hydrate production.
Publisher
AMER CHEMICAL SOC
Issue Date
2015-09
Language
English
Article Type
Article
Keywords

DIFFERENTIAL SCANNING CALORIMETER; CARBON-DIOXIDE; METHANE; SPECTROSCOPY; CO2; RECOVERY

Citation

JOURNAL OF PHYSICAL CHEMISTRY C, v.119, no.37, pp.21353 - 21357

ISSN
1932-7447
DOI
10.1021/acs.jpcc.5b05827
URI
http://hdl.handle.net/10203/205343
Appears in Collection
CBE-Journal Papers(저널논문)
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