Episode 2

Desublimation is the direct phase change of a substance from a gas to a solid, without an intermediate liquid state. This phenomenon naturally occurs in the formation of hoarfrost when water vapour from the ambient air freezes on contact with cold surfaces as ice crystals. Frost on the window in winter is a familiar example. Another is the frost formation in home freezers.

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Desublimation is used in industrial processes as a thermodynamic method for separating a certain substance from a gas stream and is an alternative process to adsorption and absorption. The separation is achieved by cooling and heating in batch-operation. In the Desublimator the gas mixture comes into contact with cooled surfaces/ fins.
Here the substance of the gas mixture to be separated desublimates either around or below its triple point and adheres to the cold surface in crystalline form.

 

Kelvion has a long track record in desublimator technology for a wide range of substances in several applications. By extensive theoretical and practical work in recent years Kelvion has transformed this process also for the desublimation of CO₂. In the context of carbon capture, desublimation is an emerging and promising method used to separate carbon dioxide (CO₂) from gas streams without the need of additional media or chemicals.

 

All you need is a cold source, so this is a great solution for CO₂ capture applications.​