Ch07

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Unformatted text preview: kPa or 99.8 torr. The results are tabulated on the next page. Below the table is a McCabe-Thiele plot of yA versus xA for determining the minimum reflux for xD = 0.995 and a horizontal q-line at y = 0.90, which intersects the equilibrium curve at x = 0.572. Therefore, the slope of the rectifying section operating line at minimum reflux is (L/V)min = (0.995 - 0.90)/(0.995 - 0.572) = 0.225. From a rearrangement of Eq. (7-7), Rmin = (L/V)min/[1 - (L/V)min] = 0.225/(1-0.225) = 0.290. Therefore, the reflux ratio for operation = 1.6Rmin = 1.6(0.290) = 0.464. Analysis: (continued) Exercise 7.21 (continued) T, oC Ps of A, torr Ps of B, torr 135.3 99.8 13.1 136.5 104.1 13.8 137.8 108.9 14.6 140.3 118.8 16.3 142.8 129.5 18.2 145.3 140.9 20.3 147.8 153.1 22.6 166.2 25.1 150.3 152.8 180.2 27.9 211.1 34.2 157.8 160.3 228.1 37.8 162.8 246.3 41.8 165.3 265.6 46.2 167.8 286.1 50.9 307.9 56.1 170.3 172.8 331.1 61.8 175.3 355.6 68.0 177.8 381.6 74.7 180.3 409.2 81.9 438.3 89.9 182.8 185.3 469.1 98.5 185.7...
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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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