1996 Fiscal Year Final Research Report Summary
Fundamental Study on Natural Gas Exploitation and CO2 Storage under the Deep Sea Bottom
| Project/Area Number |
07650895
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
化学工学一般
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| Research Institution | Osaka University |
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Principal Investigator |
OHGAKI Kazunari Osaka University Dept.of Chem.Eng., Associated Professor, 基礎工学部, 助教授 (80107078)
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| Project Period (FY) |
1995 – 1996
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| Keywords | Natural Gas Hydrate / CO_2 Storage / Energy Resources / Global Greenhouse Effect / High-Pressure Phase Behavior |
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| Research Abstract |
Natural-gas hydrate fields having a large amount of methane deposits have become the object of public attention as a potential natural-gas resource. An idea of methane exploitation in likage with CO_2 isolation has been presented elsewhere.
In the present study, (1) the isothermal phase equilibrium relations of three phase coexisting curves of CH_4 and CO_2 pure gas hydrate system are obtained, (2) the high-pressure phase equilibria of pressure and compositions relations in the gas, liquid, and mixed hydrate phases for CO_2+CH_4 system are measured, (3) the decomposition rates of each pure gas hydrate and CO_2+CH_4 mixed gas hydrate systems are obtained.
The averaged distribution coefficient of CH_4 between gas phase and hydrate phase is about 2.5, that is, methane in the hydrate phase is replaced selectively. Also the decomposition rate of CH_4 hydrate are strongly accelerated (about 3 times), on the other hand, that of CO_2 hydrate are controled (about a half) in the mixed gas-hydrate decompositions.
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