Analysis from a simulation program or handbook the

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Unformatted text preview: bottom of the column, based on the given pressures and product compositions, are determined to be approximately 350 and 380oF. From vapor pressure data, e.g. from CHEMCAD, using Eq. (7-1), P,O at 350o F = PPs 15.65 P s 2316 . = = 1167 and P,O at 380o F = Ps = . = 1159 . s PO 13.41 PO 19.98 Take the average relative volatility as (1.167 + 1.159)/2 = 1.163. From Eq. (7-26), the slope of the q-line = q/(q - 1) = 0.9/(0.9 - 1) = -9. Feed is 10 mol% vaporized. Apply the Fenske-Underwood-Gilliland method to obtain an initial estimate of reflux and stage requirements. Can use the SHOR model in CHEMCAD. The results are: Nmin = 48, Rmin = 9.37 R = 1.15Rmin = 10.77 N = 103 (102 + reboiler) N of feed = stage 50 from the top To construct the equilibrium curve for the McCabe-Thiele method, use Eq. (7-3), yP = P-O xP 1163xP . = 1+ xP P-O - 1 1 + 0163xP . (1) From Eq. (7-9), the slope of the rectifying section operating line is, L/V = R/(R+1) = 10.77/(10.77 + 1) = 0.9150 Analysis: (continued) This line passes through x = 0.98 on the 45o...
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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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