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of two components in a fixed bed packed with spherical adsorbent particles. The bed is considered to be adiabatic and diffusional resistance is assumed to be negligible since the diffusion of O2 and N2 in the adsorbents is essentially instantaneous, as observed in this study. Thus, there is local equilibrium between the gas and the solid phase of each gas component. Axial dispersion for mass and heat transfer is assumed but dispersion in the radial direction is taken to be negligible. Axial pressure drop is neglected and ideal gas law is assumed to hold since pressures involved are near atmospheric. Also the gas is assumed to have constant viscosity and heat capacity. The pure component equilibrium amounts adsorbed on the respective adsorbents were fit using the q *k = q m k b k p k k = 1 , 2 1+ m∑bjpj j=1 The temperature dependence of the Langmuir parameters is assumed to be as follows: qm = k1 exp (k2/T) and b = k3 exp (k4/T) The values of the Langmuir equation terms for Li94.5Na1.5-X-1.0 and Li94.2Na0.7Ag1.1-X- 1.0 sorbents, as well as the heats of adsorption are given in Table 3. Simulation Results. The PSA bed characteristics and the operating conditions used are summarized in Table 4. The PSA cycle parameters were chosen as close to industrially acceptable values as possible. The pressure ratio, which is the ratio of the feed pressure (PH) to the desorption pressure (PL), is an important operating characteristic and it has been shown that a value of 3 suffices for an optimal PSA performance using the Li-X-1.0 sorbent.2 The same pressure ratio was employed for the comparison of the ( 9 ) (10) 66 wPDF Image | PSA USING SUPERIOR ADSORBENTS
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