| Autor: |
Miyatake, Rintaro, Sugahara, Takeshi, Ishikawa, Tasuku, Oshima, Motoi, Jin, Yusuke, Hirai, Takayuki |
| Zdroj: |
Journal of Chemical and Engineering Data; September 2024, Vol. 69 Issue: 9 p3210-3216, 7p |
| Abstrakt: |
Isothermal phase equilibria of methane (CH4) + carbon dioxide (CO2) mixed-gas hydrate were investigated at 281.98, 284.17, 286.02, and 287.17 K for the carbon dioxide capture and storage (CCS) using gas hydrates in a reservoir after CH4hydrate exploitation. At temperatures higher than the upper quadruple point Q2(hydrate + aqueous + CO2-rich liquid + vapor phases) of pure CO2hydrate, the phase behavior in the CH4+ CO2mixed-gas hydrate system becomes very complicated due to two characteristic behaviors. One is the four-phase coexistence curve of hydrate + aqueous + CO2-rich liquid + vapor phases in the CH4+ CO2mixed-gas hydrate system, which originates from Q2and extends to the critical end point, where it intersects with the vapor–liquid critical locus of the CH4+ CO2binary system. The other is the negative azeotropic-like retrograde (local pressure minimum) behavior observed at 286.02 and 287.17 K, where the equilibrium pressure of the CH4+ CO2mixed-gas hydrate is lower than that of either pure CO2hydrate or pure CH4hydrate. When CO2is injected into a CH4-remaining reservoir after CH4hydrate exploitation, the CO2composition in the resulting in CH4+ CO2mixed-gas hydrate phase can increase up to either compositions at the local pressure minimum point (if it exists) or the four-phase equilibrium point at sediment temperatures above Q2temperature. |
| Databáze: |
Supplemental Index |
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