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4.3.3 Vacuum Ideal Four-Step Cycle The system analyzed in this section is the same as that in Figure 4.6. Again though, energy is needed to complete the blowdown and compress the purge gas to atmospheric pressure. The Grassman diagram is shown in Figure 4.13. Feed, WF 79,411J/mol 02 (96.20%) Total Work Input 82,549 |J/mol 02 (100%) Blowdown, WBI 40,629J/mol 02 (49.22%) Purge, wpu Blowdown, WB2 733 J / m o l O z (0.89%) Pressurization, WPR 17,089 J/mol 0 2 (20.70%) Expanding Product, WR 5177 (6.27%) Product Availability, i|/P 3816 J/mol 0 2 (4.62%) Exhaust Availability, \\>E Bed Loss 8696J/mol 0 2 (10.53%) Figure 4.13 Grassman Diagram for the Vacuum Ideal Four-Step Cycle. Purge, ww 2405J/mol 02 (2.91%) 333 J/mol 0 2 (0.40%) In comparing this to the Grassman diagram of Figure 4.7, we see again that less total work is required per mole of product for the vacuum cycle. However, as less work is also recovered during blowdown and expansion of the product gas, the net work input for separation is the same as that for the Ideal Four-Step cycle with PL = 1 atm. If 6808 J/mol 0 2 (8.25%) 117PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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