CO₂ Capture with Structured Sorbents Containing Multiwalled Carbon Nano Tubes and Polyethyleneimine (PEI)

In this work monolithic adsorbents containing polyethyleneimine (PEI) and multiwalled carbon nanotubes obtained by 3D printing. CO₂ and N2 isotherms were measured using a commercial volumetric apparatus. Breakthrough experiments were carried out with a synthetic flue gas containing 15% CO₂ and the rest N2. The information was used to simulate and optimize a 6-step Vacuum swing Adsorption (VSA) cycle for postcombustion CO₂ capture from a flue gas stream containing 15% CO₂ and 85% N2. Detailed process optimization revealed that it was indeed possible to achieve 95% CO₂ purity and 90% CO₂ recovery targets.