D h packing hydraulic diameter 4 0930 4 00124 m

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Unformatted text preview: e L , h ) (N ) 0.75 FrL , h -0.45 -1/ 2 ( 210 ) ( 0.0433) ( 0.000172 ) -0.2 0.75 -0.45 = 1.25 HL = 0.0595 1 = 0.048 m 1.25 Now estimate the value of HG from Eq. (6-133). Estimate the gas diffusivity from Eq. (3-36), where from Table 3.1, . . . V = 131 for water, and V = 15.9 + 4( 2.31) + 611 = 312 for methanol and molecular weights are 32 for methanol and 18 for water. DV = DAB = 0.00143T 1.75 2 P (1/ M A ) + (1/ M B ) 1/ 2 ( V ) 1/ 3 A +( V ) 1/ 3 B 2 2 1/ 3 1/ 3 2 (13.1) + ( 31.2 ) (1/18) + (1/ 32) Use the following additional properties and parameters, together with V = 1.2 x 10-2 cP and V u = 0.0370 lb/ft3 , where from Eqs. (6-134) and (6-135), N ReV = V V and N ScV = V aV V DV (1) CV uV , m/s (NSc)V (NRe)V From Eq. (6-133), for NOR PAC, = 0.00143(370)1.75 1/ 2 = 0.31 cm 2 /s NOR PAC 0.322 6.10 0.65 3,470 Montz 0.422 3.96 0.65 652 Analysis: (c) at the bottom of the column (continued) From Eq. (6-133), for NOR PAC, using SI units, 1 1/ 2 4 HG = ( - hL ) CV a4 = 1/ 2 Exercise 7.52 (conti...
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