Hydrate growth at the interface between water and CO2/CH4 gas mixtures: influence of pressure, temperature, gas composition and water soluble surfactants
Résumé
Two major bottlenecks must be overcome when exploiting gas hydrate formation to capture CO2 from natural or flue gases: selectivity, i.e., the CO2 content of the enclathrated gas, which should be as high as possible, and kinetics, which is the focus of this paper. Anionic surfactants such as SDS (sodium dodecyl sulfate) are known to be much more efficient at speeding up gas hydrate formation in the case of methane-rich gases than in the case of CO2-rich gases. To assess the kinetic efficiency of a given surfactant additive, a simple experimental method has been devised, in which hydrate formation is triggered at the top of a sessile water drop by contact with the hydrate phase, and the ensuing hydrate growth is visualized. Depending on the surfactant and gas type, very different gas hydrate growth mechanisms are observed.
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