Page 100 - Distillation theory

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74 Trajectories of Distillation in Infinite Columns Under Infinite Reflux

3.9. Questions

1. What is the difference between distillation subregion Reg sub and distillation region
Reg ?
∞
2. What is the difference between product simplex Reg simp and distillation subregion
Reg sub ?
3. What parameters determine separation mode in the finite column with infinite
reflux?
4. What parameter determines separation mode in the infinite column with infinite
reflux?
5. What is the set of feasible points of products of the finite column with infinite
reflux in concentration triangle and tetrahedron?
6. What is the set of feasible points of products of the infinite column with infinite
reflux in concentration triangle and tetrahedron?

7. Where within the concentration simplex can the product points of distillation at
R =∞ and N =∞ be located?
8. Formulate the rule of connectedness.
9. How many parts a distillation trajectory at R =∞ and N =∞ can consist of?
10. Which boundary elements of distillation region Reg or subregion Reg sub do the
∞
product points at R =∞ and N =∞ belong to?
11. How many types of boundary elements can a distillation subregion Reg sub have?
12. Can two boundary elements of distillation subregion to which product points at
R =∞ and N =∞ belong have common stationary points? If the answer is yes,
then how many common stationary points?
13. How many stationary points a distillation trajectory at R =∞ and N =∞ can go
through?
14. How many sharp splits at R =∞ and N =∞ can be?
15. Formulate the rule of product simplex.
16. In which way can the rule of connectedness be checked without structural matrix?
17. Fill up structural matrix for four-component azeotropic mixture the structure of
concentration space of which is shown at Fig. 3.15.
18. Single out all the bonds chains from the structural matrix of question 17.

19. Feed point belongs to product simplex Reg simp ≡ 12 → 1 → 3 → 4 at Fig. 3.15.
Enumerate all the boundary elements of dimensionality 0, 1, and 2 of this product
simplex. Which splits are feasible for this feeding?

3.10. Exercises with Software
1. For a mixture of acetone(1)-benzene(2)-chloroform(3)-toluene(4), determine the
location of the boundary between distillation regions.
2. For a given feed point x F in the product simplex 1-13-2-4 for the mixture of exercise
1, find the bottom point x B for the best direct separation.