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3 PSA dynamic model 28 Fig. 3.3-1 Experimental adsorption isotherms of (a) oxygen and (b) nitrogen on the CMS represented by the Sips model As presented in Fig. 3.3-2, nitrogen exhibits a slightly enhanced equilibrium affinity to the CMS adsorbent at low pressures (< 2 bar abs), whereas the opposite effect is observed at higher pressures, regardless of the adsorption temperature. Tab. 3.3-1 Sips isotherm parameters of oxygen and nitrogen adsorption on CMS w* kmol/kg − b 1/bar QkJ /kmol n − − s0 0 0 O2 3.384 × 10-3 1.104 9.436 × 10-2 1.205 × 10-1 N2 Fig. 3.3-2 Comparison of adsorption isotherms of oxygen and nitrogen on the CMS represented by the Sips model 1.222 × 104 3.341 × 10-1 2.707 × 10-3 1.187 × 104 1.120 2.263 × 10-1 1.146 1.185 In this work, the ideal adsorption solution theory (IAST) is selected since it is one of the most reliable, respected, and frequently-used methods for predicting multicomponent adsorption equilibrium using only adsorption isotherms of pure components [61]. The method is thermodynamically consistent as an adsorption analog to Raoult’s law applies. However, the IAST is not a universal method of predicting multi-component adsorption equilibria and should be carefully validated for systems with molecules that vary significantly in size, polarity, or adsorption interactions. Moreover, the method could also not provide accurate predictions for adsorbents with heterogeneous surfaces [61]. For those reasons, the adsorption of a syntheticPDF Image | Modelling and Simulation of Twin-Bed Pressure Swing Adsorption Plants
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