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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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B Where: NF A = n u m b e r o f m o l e s o f s p e c i e s A i n t h e f e e d g a s { m o l } NFB = n u m b e r o f m o l e s o f s p e c i e s B i n t h e f e e d g a s { m o l } (l -yo)p H sv (3.U) NFB = RT BA We can also calculate the volume of the feed piston at point 1 in Figure 3.3,by using the ideal gas law with N = NF and P = P0 . 1H 1H, (3.22) v yP0J PA In order to calculate the number of moles of product, w e use Equation (3.2) which relates U2to ui, along with the cross-sectional area and the time length of the feed step. Then we multiply this by the molar density, PH / RT: N =u -eA-t -^- (3-13> np. 2 2 F RT Where: Npi = number of product moles delivered during the feed step {mol} Substituting in Equations (3.2) and (3.6), we find: As can be seen in Figure 3.3, not all of these moles enter the product piston. A t some point during the feed step, the product piston volume freezes and some of the vP„y 49

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Energy Efficiency of Gas Separation Pressure Swing Adsorption

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