Importance

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Abstract

Cryogenic removal of carbon dioxide from the atmosphere, or CryoDAC (Cryogenic Direct Air Capture), uses extremely low temperatures to convert atmospheric CO₂ into a frozen solid while other components of air such as oxygen and nitrogen remain as gases. Air from the atmosphere is passed through a recuperative heat exchanger to cool the air to a temperature slightly above the deposition point of CO₂. The cooled air is then passed over a deposition surface chilled to a temperature below the deposition point of CO₂. Carbon dioxide in the air transitions from gas to solid form upon contact with the deposition surface. The frozen CO₂ is collected and stored. The cold air with CO₂ removed is passed back through the recuperative heat exchanger to cool incoming air and is then returned to the atmosphere. The deposition surface may be cooled by a cryogenic refrigerator.

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First Claim