An absorber packed with 1-in. Intalox saddles operates at 50°C and 10 atm with a liquid mass velocity 5 times the gas mass velocity. Assuming the gas and liquid are similar to air and water, what gas mass velocity will give a pressure drop of 0.5 in. H₂O/ft packing? Use the generalized correlations to get the effect of changed physical properties, and apply a correction to the data of Fig. 18.4.

Fig. 18.4

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AP, inches water/ft packing 2.0 1.0 0.8 0.6 0.4 0.2 10.-36,000 0-30,000 G-25,000 G-20,000 G.-15,000 - 12,000 G-9,000 LOG 000'9-0 000'E-'o Dry Column dia. 30 in. Packing height 10 ft 0.1 100 200 300 400 600 1,000 F-92 Liquid rate, lb/ft2-h, as parameter 2,000 Air mass velocity, Gy, lb/ft2.h 5,000 FIGURE 18.4 Pressure drop in a packed tower for air-water system with 1-in. Intalox saddles. (1,000 lb/ft h=1.356 kg/m²-s: 1 in. H₂O/ft=817 Pa/m)