Supercritical CO2 (scCO2) depollution

Supercritical CO2 (scCO2) is a fluid with interesting properties for the depollution of polymers and the disassembly of composites. This fluid has intermediate properties between those of a gas and a liquid, enabling contaminants to be extracted efficiently from polymers, while preserving their initial appearance. As a result, the depolluted polymers can be reintroduced into a production cycle along with virgin materials.

We are currently using this fluid in two experimental set-ups:

This instrument ensures that the sample remains in contact with the same volume of scCO2 throughout the experiment. In addition, a stirrer enables uniform contact between the sample and the scCO2.

scCO2 static extraction autoclave
Diagram of scCO2 static extraction autoclave assembly*
Comparison of GCMS curves where the PP treated with CO2 has a depollution of -86% and where the PP treated with CO2 and co-solvent has a depollution of -99%.
Comparison of GCMS curves for static depollution

This instrument allows a continuous flow of scCO2 to pass through the sample during the entire course of the experiment. As it passes through the sample, the flow of scCO2 extracts contaminants, which are evacuated from the cell and collected in the separators, avoiding saturation of the scCO2 and maximising extraction efficiency.

scCO2 dynamic extraction cell
Diagram of scCO2 dynamic extraction cell assembly*
Comparison of GCMS curves where the PP treated with CO2 has a depollution of -98%.
Comparison of GCMS curves in dynamic depollution

In addition to the experimental set-ups already in place, our team regularly develops and invests in new set-ups and instruments to meet specific needs.
So do not hesitate to contact us to discuss your specific requirements.