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3.2.5 Pressurization Step The final step i n th e Four-Step cycle is pressurization with product, during which some more of the pure product (at P = PH) is throttled back into the bed to raise the pressure from PL to PH. No work is required for pressurization, but we must keep track of the flows during this step in order to calculate the final amount of product. The number of moles used to pressurize the bed is found by subtractingthe number of moles in the bed at low pressure from the number of moles in the bed at high pressure. {PH-PL)SVB (3.52) RT fiB We can now calculate the final number of moles in the product piston and the volume of the product piston required in Section 3.2.6 to calculate the work recovered by expanding the product gas to atmospheric pressure. The final number of moles in the product piston is: Upon substituting we find: Now we can calculate Vp2 using the ideal gas law with P = PH- + J ,0 -IW-I)^B )PA (3.55) [P„(y0-1) RT + PL CMeV,B (3.54) PA PR (3.53) 64PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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