2-3-4 二酸化炭素ハイドレートのガス包蔵量の生成温度圧力依存性(2-3 ガスハイドレート,Session 2 天然ガス・メタンハイドレート等)

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This paper reports an experimental investigation of cage occupancy for simple clathrate hydrates of carbon dioxide. Clathrate hydrates are the guest-host compounds that consist of water (host) and the other molecules (guest). They are known as nonstoichiometric substances, because the capacity of guest substances could be varied corresponding to the formation condition. The technology using clathrate hydrates of carbon dioxide are expected to be the one for the carbon capture and storage. Therefore, the capacity of carbon dioxide in clathrate hydrates, i.e., cage occupancy, is important property for industrial use. We investigated the cage occupancy of CO_2 hydrates formed in several different formation conditions. The hydrate samples were formed at the pressure over or nearly equal to the phase equilibrium pressure. The formation conditions were ranged in the temperatures from 274 K to 280 K and the pressures from 1.5 MPa to 3 MPa. The powder X-ray diffraction measurement technique was applied to measure the cage occupancies with the aid of the direct space method for clathrate hydrates. The method allows to determine cage occupancies considering the effect of guest molecule disorder. The pressure dependence for the small cage occupancy was clearly shown. The obtained cage-occupancy data were compared with the experimental data and thermodynamic models reported in the literature.
一般社団法人日本エネルギー学会の論文
2013-07-29