4 or say 70 from eq 6 37 assuming that the equilibrium

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Unformatted text preview: g [1 + 0.70(0.844 - 1) ] = = 0.68 or 68% log log(0.844) Exercise 7.43 Subject: Estimation of column diameter at top tray of a distillation column separating benzene from monochlorobenzene. Given: Conditions at the top tray in Fig. 7.46. Find: Column diameter for a valve tray at 85% of flooding. Analysis: Use Fig. 6.24, where the value of FLV is needed. V = 336.5 lbmol/h, L = 274.7 lbmol/h Because both the vapor and liquid are almost pure benzene, take MV and ML = 78.1 From Perry's Handbook, the liquid density of benzene at 204oF and 23 psia = L = 52 lb/ft3 From the ideal gas law, V = PMV/RT = (23)(78.1)/[(10.73)(664)] = 0.252 lb/ft3 FLV LM L V = VMV L 1/ 2 = (274.7)(78.1) 0.252 (336.5)(781) 52 . 0.5 = 0.057 Assume 24-inch tray spacing. From Fig. 6.24, CF = 0.37 From below Eq. (6-44), Ad/A = 0.1 From the Handbook of Chemistry and Physics, for benzene under its own vapor, = 30 dyne/cm. From below Eq. (6-42), FST = (30/20)0.2 = 1.084 Assume that the foaming factor, FF = 1.0 and take FHA = 1.0 . From Eq. (6-42), C = 1.0...
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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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