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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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A. Discussion Problems

A1. Explain why the external mass balances cannot be solved for a ternary distillation system without an additional assumption. Why aren’t the equations for the following useful?

a. External energy balance

b. Energy balance around the condenser

c. Equilibrium expression in the reboiler

A2. If constant relativity is valid for a ternary separation and we choose component A or C as the reference component instead of component B, what are the consequences?

A3. Define the following:

a. Heavy key

b. Heavy non-key

c. Sandwich component (see Problem 5.A6)

d. Optimum feed stage

e. Minimum reflux ratio

A4. We are distilling a mixture with two HNKs, an HK, and an LK. Sketch the expected concentration profiles (xi vs. stage location). ...

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