Design and Operation of Pressure Swing Adsorption Processes

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Design and Operation of Pressure Swing Adsorption Processes ( design-and-operation-pressure-swing-adsorption-processes )

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Mwi Mw Nc P Pi Pads Pdes PH PL Qf eed,i qi qi∗ R Rp T Tw TRi ta tp UA u0 uL ua uf eed ureg v Wtotal yi yf,i molecular weight of ith component (kg gmol−1) average molecular weight of the gas mixture (kg gmol−1) number of components in the mixture total bed pressure (kPa) partial pressure of ith component (kPa) pressure at the light end of the co-current bed (kPa) pressure at the heavy end of the counter-current bed (kPa) adsorption pressure for Skarstrom cycle (same as Ph, Phigh) (kPa) desorption pressure for Skarstrom cycle (same as Pl, Plow) (kPa) flux of ith component in the feed stream (gmol m−2 sec−1) solid-phase concentration of ith component (gmol kg−1) equilibrium solid-phase concentration of ith component (gmol kg−1) universal gas constant (J gmol−1 K−1 ) adsorbent particle radius (m) gas-phase temperature in the bed (K) wall/ambient temperature (K) flux of ith component in the top reflux stream (gmol m−2 sec−1) adsorption step time (same as desorption time) (sec) pressurization step time (same as depressurization time) (sec) effective heat transfer coefficient (J m−3 sec−1 K−1) bed inlet superficial velocity at x = 0 (m sec−1) bed exit superficial velocity at x = L (m sec−1) feed velocity for the adsorption step (m sec−1) feed velocity (m sec−1) exhaust velocity (m sec−1) gas superficial velocity (m sec−1) total work done by the compressors and the vacuum generator (J m−2 sec−1) mole fraction of ith component feed mole fraction of ith component Chapter A. Nomenclature 207

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