D212 TRANSITION OF CO_2 HYDRATE FILM THICKNESS WITH TIME PROGRESS(Environmental Protection-2)

概要

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The objective of the present study is to measure the CO_2 hydrate film thickness experimentally and predict the time transition of the hydrate film thickness by the analysis. In the experiment, the hydrate film thickness which forms at the interface between water and liquid CO_2 was measured by laser interference method. The hydrate film thickness was about 8 μm at 6 MPa and 7.1 ℃ with water flow adjacent to the hydrate film. The hydrate film thickness was about 13 pm at 6 MPa and 4.6 ℃ without water flow. In the analysis model, hydrate formation occurs at the interface between the liquid CO_2 and the hydrate due to the penetration of H_2O molecules through the hydrate film. Meanwhile hydrate dissolution occurs at the interface between the water and the hydrate due to the diffusion of CO_2 molecules to the water phase. The results indicate the film thickness decreases within several minutes, then increases.
2009-11-16