(193q) Carbon Dioxide Clathrate Hydrate Phase Equilibrium

Clathrate hydrates (or gas hydrates) are ice-like crystalline compounds which form through a combination of water “host” and suitably sized “guest” molecules, typically under low temperatures and elevated pressures. In clathrate hydrates, water molecules form hydrogen-bonded cavity structures encapsulating the guest molecules, which generally consist of low molecular diameter gases. Clathrate hydrates have been of interest to the oil and gas industry mainly because their formation can blockage pipelines and production/processing facilities.

On the other hand, the subject of carbon dioxide (CO₂) capture and sequestration is important in many engineering applications, particularly in environmental science. Capturing CO₂ by hydrates is a promising approach because it can trap high volumes of this gas. In this work, we first describe the detail of an experimental setup for measuring the dissociation conditions of CO₂ clathrate hydrates and then we report the dissociation conditions at temperatures between 273 and 283 K and pressures up to 5 MPa, which were measured by an isochoric pressure-search method. The reported experimental data are compared with some selected experimental data from the literature and the agreement is found acceptable.