Pre and Post Combustion Capture of Carbon Dioxide via Hydrate Formation

One of the new approaches for capturing carbon dioxide from treated flue gases (post- combustion capture) is based on gas hydrate crystallization. The carbon dioxide content of the gas hydrate crystals is different than that of the flue gas. This provides the basis for the separation or capture of the CO₂. Moreover, when a gas mixture of CO₂ and H₂ forms gas hydrates the CO₂ which forms hydrate at lower pressure prefers to partition in the hydrate phase. This provides the basis for the separation of CO₂ (pre- combustion capture). The present study illustrates the concept and provides basic thermodynamic and kinetic data supporting process development.