Air separation by modified molecular sieving carbon
In this paper, the Langmuir kinetics rate expression, which has gained currency in modeling O2/N2 mass transfer in carbon molecular sieve adsorbents, is derived, starting from “surface barrier” model of diffusion under a chemical potential gradient; this provides a physical basis for the use of mass-action rate laws to describe diffusion processes.
Pressure gradients were generated during counter-diffusion of adsorbing gases within pelletized activated carbon pellets and modified molecular-sieving carbon pellets even though external isobaric conditions were maintained. Such non-isobaric phenomena were analysed with a zone reaction model which incorporated a flow equation, adsorption equilibrium relationships of gases, and adsorption rates. It was found that pressure gradients are induced within the porous solids by differences in diffusion rates, adsorptivities and adsorption rates of the counter-diffusing gases.
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