New carbon capture system has 99% efficiency, and is twice as fast

A study on the new carbon capture method titled "Direct Air Capture of CO₂ Using a Liquid Amine-Solid Carbamic Acid Phase-Separation System Using Diamines Bearing an Aminocyclohexyl Group" has been published in the journal ACS Environmental Au.

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Researchers from the Tokyo Metropolitan University have developed a new direct air capture (DAC) system for removing carbon dioxide (CO₂) from the atmosphere. The system passes atmospheric air with relatively low concentrations of CO₂ through an aqueous solution of isophorone diamine (IPDA), causing the carbon dioxide to react rapidly and create a solid product.

The solution can also be mildly heated to release the CO₂, allowing it to be collected and concentrated for storage or other applications. Heating the system to release the CO₂ enables it to be reused to capture more CO₂. The IPDA solution can capture 99% of the CO₂ in air and turn it into a solid carbamic acid precipitate.

Compared to leading DAC lab systems, the new system is at least twice as fast at capturing carbon dioxide from atmospheric air with a low concentration of CO₂ (~400 parts per million, or ppm).

You can read more from the study here.

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