Green Hydrogen Recovery from Natural Gas Grids by Vacuum Pressure Swing Adsorption
Résumé
This study focuses on the development of a conceptual vacuum pressure swing adsorption process (VPSA) for green hydrogen (GH) recovery from natural gas grids (NGG). Accordingly, the kinetic-based separation of H 2 from NGG was achieved by Page 1 of 41
Industrial & Engineering Chemistry Research using a commercial carbon molecular sieve (CMS-3K-172) adsorbent. To develop the VPSA cycle, the CMS-3K-172 was characterized, single and multicomponent breakthrough curves for H 2 and CH 4 were performed, and adsorption isotherms were collected between 195 and 273 K, and pressures up to 18 bar. To separate H 2 (20%) from CH 4 (80%), three different VPSA cycle configurations were designed and simulated using Aspen Adsorption. The operational variables, such as step times, intermediate-to-high pressure ratio, purge-to-feed ratio, and H 2 initial concentration were evaluated for maximum values of purity, recovery, and adsorbent productivity. The results show that the VPSA processes can enrich H 2 in the product stream up to 68% with a recovery of 92%.
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