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phase; there is a higher fraction of the heavy component in the adsorbed phase than in the gas phase. To express Equations (2.26) and (2.27) in terms of the total pressure P, we again define the mole fraction of a gas to be the mole fraction of species A in the gas phase (y = yA). This implies that yB= 1-y, and: BBRT To find the absolute number of adsorbed moles we multiply Equations (2.28) and (2.29) by the volume of adsorbent, which is related to the total volume of the adsorbent bed by the non-dimensional fraction porosity (denoted by e). Porosity is the fraction of the adsorbent bed that is empty space. Therefore, the fraction of the adsorbent bed filled with adsorbent is (1 - s), and the number of moles in the adsorbed phase is: Where: N — Jr yP(\-e)VB (2.30) (2.31) J V A,adsorbed ~ A RT „ = k (l-yW~e)VB ^ B,adsorbed KB rp R NA . adsorbed = number of adsorbed moles of species A in the bed {mol} NB , adsorbed = number of adsorbed moles of species B in the bed {mol} 22PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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