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5 Validation of the mathematical model 58 At experimentally investigated conditions, the application of a cutting step is particularly advantageous for the generation of product at the higher purity level of 10 ppm O2, since the air demand can be reduced whereas the productivity remains rather unaffected. It indicates that the oxygen desorption occurs in the initial phase of the blow-down and the purge steps, respectively, so the packed-bed with a narrow mass transfer zone is regenerated sufficiently. Moreover, the tail-gas becomes less diluted by nitrogen. It signifies that the desorption of nitrogen progresses during the cutting step, which ensures lower oxygen concentration in the adsorber at the beginning of the subsequent production. Furthermore, higher initial pressure in the system is obtained. Fig. 5.2.3-2 PSA performance at different cutting time: (a, b) productivity; (c, d) air demand; (a, c) as a function of product purity; (b, d) as a function of cutting time When nitrogen of a lower purity (1000 ppm O2) is required, cutting should not be considered in the PSA cycle as a slight decline in productivity occurs. It indicates that an insufficient amount of time was provided for a desorption of oxygen, which forms a wide MTZ along the adsorber. Consequently, the packed-bed is not properly regenerated before the following production step, and the premature oxygen breakthrough occurs. Since the air demand remainsPDF Image | Modelling and Simulation of Twin-Bed Pressure Swing Adsorption Plants
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