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Table 3.1: Table of adsorbent physical properties and finite element parameters. ns m ∆H bo ρb χ-particle porosity ε-void fraction of packing ε′-total bed voidage k Cps Cp,air Cp,CO2 D feed flow rate air mole fraction in feed CO2 mole fraction in feed feed temperature 4.07 mol/kg sorbent 0.518 41.8 kJ/mol 1.74×105 700 kg/m3 0.5 0.4 0.7 0.135 W/m K 960 kJ/kg K 40.3 J/mol K 29.25 J/mol K 0.05 m2/s 0.02633 m3/s 0.9974 0.0026 298 K capacities of air and CO2 are constant, which is consistent with the thermodynamic path, developed by Walton and LeVan,10 used in writing the energy balance. The isosteric heat of adsorption is constant. Adsorption of N2 and O2 are negligible, and therefore adsorption of CO2 on 5A zeolite is described by a pure component isotherm with the adsorbent properties listed in Table 3.1. The isotherm chosen to model CO2 adsorption is the multi-temperature Toth isotherm given by Taqvi and LeVan12 b −1/m n=ns 1+Pm (3.1) where the partial pressure of CO2 is in Pa, ns is the saturation capacity, and b and m are Toth parameters appearing in b = b0 exp(−mλ/RT ) (3.2) with λ representing the isosteric heat of adsorption. The Toth parameters used in the finite element modeling are listed in Table 3.1. 29PDF Image | TEMPERATURE SWING ADSORPTION COMPRESSION AND MEMBRANE SEPARATIONS
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