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desired pressure is reached. The sorbent bed is then opened to allow the sorbate to bleed off the sorbent at a constant pressure by the continuous addition of heat in the production step. Delivery is achieved at the expense of sorbate loading within the bed. The sorbent bed is then closed off again and cooled, representing the regener- ation step of the cycle. As the energy within the bed dissipates, the internal pressure falls and the residual sorbate is then readsorbed. When the bed reaches the original temperature, it is ready to initiate the cycle again. 2.2 Theory We examine mass and energy transport for TSA as outlined by the generalized equationsfoundinBirdetal.2 withthefollowingassumptions.Thegasphasecanbe described by the ideal gas law. N2 and O2 are inert and can be modeled as a single component, i.e., air. Heat 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 2.1. Pure-component adsorption of CO2 onto 5A was modeled by the multi-temperature Toth isotherm Taqvi et al.1 developed and given by b −1/m n=ns 1+Pm (2.1) where P is 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 ) (2.2) with λ representing the isosteric heat of adsorption. The Toth parameters used in our finite element models are listed in Table 2.1. 9PDF Image | TEMPERATURE SWING ADSORPTION COMPRESSION AND MEMBRANE SEPARATIONS
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