3 same as 1 except two equilibrium stages between the

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Unformatted text preview: two equilibrium stages between the condenser and reboiler. 4. Same as 3 except that reflux bypasses the top equilibrium stage. 5. Same as 2 except that feed is sent to the stage between the condenser and the reboiler. Assumptions: Constant molar overflow. Constant relative volatility = , = 2.5. Find: For each procedure, determine: (a) Moles of distillate per 100 moles of feed. (b) Moles of total vapor generated per mole of distillate. (c) Mole percent of benzene in the bottoms (residue). (d) y-x diagram, indicating compositions of distillate, reflux, and residue. Also, (e) For maximization of benzene recovery (in the distillate), which procedure is preferred. Analysis: For each procedure, the partial condenser and the partial reboiler are equilibrium stages. Benzene is the more volatile component, so the y-x diagram is based on benzene. Because the relative volatility = constant = 2.5, the equilibrium relationship is given by Eq. (7-3), x 2.5x = (1) 1 + x ( - 1) 1 + 15x . Take as a basis, 1...
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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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