Principles Of Nitrogen Generation Via Carbon Molecular Sieve Air Separation

Carbon molecular sieves are carbon-based adsorbents-porous materials characterized by a disordered carbon structure. As non-stoichiometric compounds, their key properties derive from their microporous structure. Their ability to separate air relies on the differing diffusion rates of various gases within the micropores, differing adsorption affinities, or a combination of both effects. Under equilibrium conditions, the adsorption capacities for oxygen and nitrogen are quite similar; however, oxygen molecules diffuse much more rapidly than nitrogen molecules through the narrow voids of the microporous network. Nitrogen generation via carbon molecular sieve air separation exploits this kinetic difference, utilizing the Pressure Swing Adsorption (PSA) process to isolate nitrogen from the air well before equilibrium is reached.