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Unformatted text preview: OG that are assumed constant over the packed sections, which is not the case because m varies. (e) Compute pressure drops for the packed sections from the correlation of Billet and Schultes. The pressure drop per unit height of packed bed is given by Eq. (6115),
1/ 2 Po  hL P 13300 = exp ( N FrL ) lT lT a 3/ 2 This equation will be used for each packing in each section. 3/ 2 (1) Po a u2 1 = o 3 V V lT 2 g c KW The required packing parameters are as follows from Table 6.8 and above: NOR PAC Montz 2 3 FP , ft /ft 14 33 2 3 a, m /m 86.8 300 0.947 0.930 , m3/m3 Ch 0.651 0.482 0.350 0.295 Cp From Eq. (6110), From Eq. (6112), DP = 6 (2) 1 1  0.947 =6 = 0.00366 m or 0.012 ft for NOR PAC a 86.8 1 1  0.930 DP = 6 =6 = 0.0014 m or 0.00459 ft for Montz a 300 Rectifying section of the column: For NOR PAC , column diameter = DT = 4.3 ft
From Eq. (6111), 1 2 1 DP 2 1 0.012 = 1+ = 1+ = 1035 . KW 3 1  DT 3 1  0.947 4.3 Therefore, KW = 1/1.035 = 0.966 Analysis: (e) (continued) Exercise 7.52 (continued) For Mo...
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This note was uploaded on 09/08/2008 for the course CHE 244 taught by Professor Selebi during the Spring '06 term at Lehigh University .
 Spring '06
 selebi
 Distillation, pH, Mass Transfer

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