Distillate is to contain 90 mol benzene yd 09 at a

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Unformatted text preview: moles of feed. The relative volatility of benzene with respect to toluene = = 2.5. Find: Moles of vapor generated in the reboiler per 100 moles of feed by analytical and graphical methods. Analysis: First compute overall material balance. The total condenser need not be considered. Basis: 100 moles of feed. Overall total material balance: F = 100 = D + B = 25 + B (1) Solving Eq. (1), B = 75 moles Overall benzene material balance: FxF = 69.4 = DyD + BxB = 25(0.9) + 75xB (2) Solving Eq. (2), xB = 0.625 Analytical Method: Write material balances around the partial reboiler and partial condenser, using subscripts B for streams leaving the reboiler and D for streams leaving the partial condenser. Partial reboiler: Total material balance: F + LD = B + VB or 100 + LD = 75 + VB (3) Benzene material balance: FxF + LDxD = BxB + VByB (4) or 69.4 + LDxD = 75(0.625) + VByB = 46.9 + VByB Partial condenser: Total material balance: VB = D + LD = 75 + LD (5) Benzene material balance: VByB = DyD + LDxD = 75(0.9) + LDxD = 67.5 + LDxD (6) Assume equilibrium in the partial condenser and partial...
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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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