CAPTACO2 – Absortion testing

22 October 2021

CAPTACO2 project begins a new testing phase.

Firstly because it uses a new module, designed to be easily assembled and with a higher capacity than older modules. And secondly because it uses a migrogc, a small gas chromatograph, to analyze the absorption capacity.

The image shows the module connected on one side to the pump that recirculates the absorbent solution and on the other to the chromatograph.

The module is composed of different stages. The lower stage contains the absorbing liquid that circulates with the impulse of the pump, while the upper stage contains the atmospheric air from which the carbon dioxide is absorbed.

The membrane is then placed between the two stages, and is then in contact with the liquid on its bottom side and with the air on its top side.

The experiment works as follows. The ambient air is introduced into the upper stage with a very low flow, coming into contact with the absorbent liquid through the membrane. When the air comes out, the amount of CO2 it contains is continuously measured by the gas chromatograph.

By knowing the amount of CO2 in the ambient air, it is possible to determine how much of it has passed through the membrane and has been absorbed by the absorbent liquid.

This absorbed amount will depend on how efficient the liquid and the membrane are, thus it will be possible to determine the optimal combination in order to obtain the maximum absorption value.