With the objective to check the scalability of the results of Doctor Adrianna Nogalska’s thesis (which is the base to develop the project as previously explained), testing of a bigger module has started at Eurecat labs in Tarragona.
The module, as shown in the picture, is a 120x120x200mm box with an internal volume of approx 1 liter. On each vertical face there is a housing to place the polisulfone membrane. Inside the module the hydroxide will be in contact with the membrane, being physically separated from the air sorrounding the module.
The membrane should prevent the hydroxide to evaporate while preconcentrating enough carbon dioxide on ints external face to let it pass through its pores.
There are two different hydroxides which may be able to carry out the chemical reaction: potassium hydroxide and barium hydroxide. The first one, once reacted with the CO2, forms potassium carbonate which later can be used to get formic acid. Barium hydroxide, converserly, precipitates into barium carbonate and thus is easier to remove from the module.
Testing results shall give the clues to continue with the development of the module.