2 g since nre 5 use eq 6 101 0 0 ah a 085ch n re25

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Unformatted text preview: ate of the diffusivity of benzene in toluene at high concentrations of benzene. Because these two components form a nearly ideal solution, assume that this diffusivity is equal to that of toluene (A) at infinite dilution in benzene (B), as estimated from the Eq. (3-42), using Table 3.3 and Table 3.2. In this equation, T = 180oF = 356 K, B = 205.3, A = 245.5, = 0.32 cP, and = 6(14.8)+6(3.7) -15 = 96 DL = DAB = 155 10-8 . T 1.29 (PB0.5 / PA0.5 ) 3551.29 (205.30.5 / 24550.42 ) . = 155 10-8 . = 4.28 10-5 cm2/s 0.92 0.23 0.92 0.23 B B 0.32 96 Analysis: (c) top of the column (continued) From Eq. (6-132), 1 1 HL = CL 12 = 0.24 a aPh 1/ 6 Exercise 7.53 (continued) 4hL DL au L m 1/ 2 uL a a 1 1 = aPh 1.168 12 1/ 6 4(0.0294)(0.977) (4.28 10 -9 )(92.3)(0.00512) 1/ 2 0.00512 92.3 a aPh To compute (aPh /a), we need for the liquid phase, the Reynolds, Weber, and Froude numbers from equations (6-138), (6-139), and (6-140), respectively, based on the packing hydraulic diameter from (6-137). d h = packing h...
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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 .

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