Column has a total condenser and a partial reboiler

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Unformatted text preview: h a reflux ratio of L/D = R = 1.0. Vapor-liquid equilibrium data in Exercise of 7.19. Assumptions: Constant molar overflow. Find: Feed stage location and number of equilibrium stages. Analysis: First, determine feed composition in mol%. Using molecular weights of 32.04 for methanol and 18.02 for water, Component Methanol Water Total: kg/h 14,460 10,440 24,900 kmol/h 451.3 579.4 1,030.7 Mol% 43.79 56.21 100.00 Using the vapor-liquid equilibrium data, a y-x plot for the McCabe-Thiele method is made and smoothed with a spreadsheet, noting that methanol is the more volatile. Therefore, xF = 0.4379, xD = 0.99, xB = 0.01. From Eq. (7-26), slope of q-line = q/(q - 1) = 1.12/(1.12 - 1) = 9.333. Therefore, on the McCabeThiele diagram, a line is drawn with a slope of 9.333 that intersects the point {0.438,0.438}. From Eq. (7-7), the slope of the rectifying section operating line = L/V = R/(R + 1) = 1/(1 + 1) = 0.5. This line is drawn on the McCabe-Thiele diagram with a slope of 0.5 that intersects the point {0.99,0.99}. The stripping section operating line...
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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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