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6 PSA process dynamics 76 The oxygen MTZ during production and regeneration steps is presented in Fig. 6-5 at product purity levels of 1000 and 10 ppm O2. The wave-front of oxygen concentration is self-sharpening during adsorption and self-flattering during desorption, which is a result of the favourable-type isotherm. The roll-up effect can be spotted at the time of production step, indicating the replacement of nitrogen molecules by oxygen inside the CMS; most likely due to much faster oxygen kinetics. An extended MTZ along the adsorber occurs in case of lower purity level, which indicates an enhanced mass dispersion caused by the elevated gas superficial velocity. In contrast, at a high nitrogen purity level the MTZ is situated mostly in the bottom part of the bed, so the top part is occupied almost exclusively by purified nitrogen gas. The corresponding MTZ of nitrogen is presented in Fig. 6-6. Fig. 6-5 Oxygen MTZ along the adsorber length at different time of the PSA reference cycle: (a, c) at product purity of 1000 ppm O2; (b, d) at product purity of 10 ppm O2; (a, b) during the production; (c, d) during the regeneration; here nodes 1 and 70 indicate the bottom and the top of the column, respectivelyPDF Image | Modelling and Simulation of Twin-Bed Pressure Swing Adsorption Plants
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