Sunday, September 8, 2019

Gas Hydrate

Methane hydrates is a resource in which a large amount of methane is trapped within a crystal structure of water, forming a solid similar to ice (Kvenvolden, 1995).. 

Natural gas hydrates are solids that form from a combination of water and one or more hydrocarbon or non-hydrocarbon gases. In physical appearance, gas hydrates resemble packed snow or ice. In a gas hydrate, the gas molecules (such as methane, hence the methane hydrates) are trapped within a cage-like crystal structure composed of water molecules. Gas hydrates are stable only under spesific conditions of pressure and temperature. Under the appropriate pressure, they can exist at temperatures significantly above the freezing point of water.  The maximum temperature at which gas hydrate can exist depends on pressure and gas composition. For example, methane plus water at 600 psia forms hydrate at 5 degree C, while at the same pressure, methane with 1% v/v propane forms a gas hydrate at 9.4 degree C. Hydrate stability can also be influenced by other factors, such as salinity (Edmonds et al, 1996).


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