oa South African Journal of Chemical Engineering - Pilot-scale experiments for nitrogen separation from air by pressure swing adsorption



A two-bed pressure swing adsorption (PSA) system for nitrogen separation from air using carbon molecular sieve is studied. The effects of feed flow rate, purge-to-feed ratio (P/F), and adsorption step pressure as well as adsorption step time on the product purity and recovery are also investigated. The energy, mass and momentum balances are included in the model. The coupled PDEs are solved using fourth order Runge-Kutta scheme. Results showed that nitrogen purity decreases with feed flow rate. As the P/F and adsorption pressure are increased the nitrogen purity also increases. The simulation results also have very good agreement with the experimental data.


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