LIMITS OF SMALL SCALE PRESSURE SWING ADSORPTION

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LIMITS OF SMALL SCALE PRESSURE SWING ADSORPTION ( limits-small-scale-pressure-swing-adsorption )

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correspond to feed end measurements. The pressure ratio on the product end of the column is lower when pressure drop is significant. The superficial production step velocities cited in Table 5.5 and 5.6 are at the production step pressure. Cycle times were decreased until the apparatus could no longer maintain the desired pressure ratio at the feed end of the process (combination of flow, valve CV, and pressure limitations). Table 5.4 Experimental column specifications for pressure drop study Short Long Column diameter (cm) Column length (cm) Amount of adsorbent per column (g) columns columns 1.09 0.77 9.8 19.6 5.7 5.7 Table 5.5 Cycle specifications for short column cycles in pressure drop study Cycle 1 Cycle 2 Cycle 3 Production step superficial velocity (cm/s) 7.5 10.9 15.8 Feed Press./Production (s) 6.75 4.3 2.9 Blowdown (s) 4.75 3.3 1.9 1.1 Purge (s) 2 1 1 0.3 Eq. (s) 0.5 0.5 0.5 0.5 Total cycle time (s) 14.5 9.6 6.8 3.8 Cycle 4 Pressure ratio 4.5, P/F ratio 0.4, product purity: 96% oxygen , production step pressure ~195 kPa, synthetic air 28.8 1.4 95

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