Study Questions for
“Separation Process Principles” by
J. D. Seader and Ernest J. Henley
Chapter 13
1. How does batch distillation differ from continuous distillation?
2. When should the use of batch distillation be considered?
Section 13.1:
3. What is differential (Rayleigh) distillation?
4. Is differential distillation modeled by an algebraic or differential equation?
5. For what kinds of mixtures is differential distillation adequate?
6. What assumptions are made to derive (13-5)?
Section 13.2:
7. What is a batch rectifier?
8. What assumption is necessary to permit the application of the McCabe-Thiele diagram to a batch rectifier operating at a constant reflux ratio?
9. What is the easy way to determine the average composition of the distillate from a batch rectifier?
Section 13.3:
10. Which is easier to implement: (1) the constant reflux policy or (2) the constant distillate composition policy? Why?
11. Is the McCabe-Thiele method easily applied to a batch rectifier operating at a constant distillate composition? Why?
Section 13.4:
12. What is a batch stripper?
Section 13.5:
14. What effects does liquid holdup have on batch rectification?
Section 13.6:
15. What method developed for continuous distillation is used by shortcut methods for multicomponent batch rectification?
16. Do the shortcut methods account for liquid holdup?
Section 13.7:
17. What are the assumptions of the rigorous model of Distefano?
18. Why is the model referred to as a differential-algebraic system?
19. What is the difference between truncation error and stability?
20. How does the explicit Euler method differ from the implicit method?
21. What is stiffness and how does it arise. What criterion can be used to determine the degree of stiffness, if any?
22. What is meant by a quasi-steady-state procedure? How is it applied to the rigorous model?
