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Energy Efficiency of Gas Separation Pressure Swing Adsorption

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Energy Efficiency of Gas Separation Pressure Swing Adsorption ( energy-efficiency-gas-separation-pressure-swing-adsorption )

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In Figure 5.2 (a) the overall flows between the cells, and the mole fraction in the cells are noted. If we look at Cell 2, the flow of species A to the left side of the cell is yiqi, asyisthemolefractionofspeciesA.TheflowofspeciesAtotherightofCell2is y2q2. If we now look at Figure 5.2 (b), the flow to the right of Cell 2 is negative, so the flow of species A is - y 3 q 2 ; instead of looking to Cell 2 for the mole fraction of species A , we look to Cell 3. A third possibility is in Figure 5.2 (c), in which both flows are negative, and the flow of species A to the left of the cell is - y 2 q i , and the flow of species A to the right of the cell is -y3q2 . The fourth possibility is in Figure 5.2 (d), and has a negative flow to the left of Cell 2 and a positive flow to the right. In this case, both of the flows look to Cell 2 for the "information" regarding the amount of species A in that flow. qA,i-i = qi-iVL {m3/s} Figure 5.3 Cell 'i'ofthe CSTRModel (Species A Mole Balance). Mole Fraction = yi {-} Pressure = P {Pa} Volume = sVc {m3} v qA,i = qiyR {m3/s} Volume = (l-s)Vc {m3} 134

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Energy Efficiency of Gas Separation Pressure Swing Adsorption

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