Benchmarking selective capture of trace CO₂ from C₂H₂ using an amine-functionalized adsorbent.

ABSTRACT: Purifying C₂H₂ by removing trace CO₂ is critically needed yet challenged by their analogous physical properties. Herein, we report a commercial resin adsorbent HP20 (Diaion® HP-20 Resin) loaded with polyethyleneimine (PEI@HP20) which selectively captures trace CO₂ and excludes C₂H₂. PEI@HP20 possesses a high CO₂ adsorption capacity (4.35 mmol/g) at 100 kPa and 298 K and a record CO₂/C₂H₂ uptake ratio compared with all reported CO₂-selective adsorbents. The ideal adsorbed solution theory selectivity reaches 1.33×10⁷. The pilot-scale pressure-temperature swing adsorption on 2 kg PEI@HP20 further validated that it can obtain >99.99% purity C₂H₂

SUBMITTER: Zou JS 

PROVIDER: S-EPMC11911411 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature