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The hatched portion of the cell represents the amount of the cell that is composed of adsorbent. This fraction of the cell is 1 - e, as s is the void fraction. This distinguishes two separate phases within the cell. The first is the gas phase; this is composed of all the gas in the void space of the cell. This gas has mole fraction yi and pressure P, and fills the volume eVc, where Vc is the volume of the cell. The second is the adsorbed phase; this is composed of all the gas adsorbed onto the adsorbent (in the adsorbed or solid phase). The amount of gas adsorbed is dependent on the pressure of the gas in the gas phase (quantified by the equilibrium isotherm), and fills the volume 1-8. There are three components to consider when completing a mole balance on cell i: the gas flow entering and leaving the cell, the gas stored in the gas phase, and the gas stored in the adsorbed phase. The number of moles accumulating in the cell due to the flow in and out is described by Equation (5.1). Where: dNm,i = moles accumulated in cell {mol} dt = incremental change in time {s} qu = flow to the left of cell i {m3/s} q, = flow to the right of cell i {m3/s} The number of moles in the gas phase is found using the ideal gas law with the void volume of the cell. 130PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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