Referring to Tables 6.1 and 6.2, determine the approximate height ...

[olgavictoria]

Referring to Tables 6.1 and 6.2, determine the approximate height of Vigreux columns needed
  to separate binary mixtures of compounds with the following boiling-point differences.
  (a) 50
  (b) 25
  (c) 5

Question 2

Explain why flooding in the fractionation column can lead to a poor separation of distilling
  components.

[snackralk]

Answer to Question 1

(a) With a Vigreux column, a 50 boiling difference requires three theoretical plates (TP).
Therefore, a column of (8 cm/TP x 3) or 24 cm would be required.
(b) About eight theoretical plates would be needed (extrapolating from the data given in the
table); therefore, a 64 cm column would be needed.
(c) About 45 theoretical plates would be needed; therefore, a 360 cm column would be
needed.

Answer to Question 2

With flooding, the vapor and liqid are not inequilibrium. Therefore, the column is less efficient
(few theoretical plates).

[olgavictoria]

Thanks for the timely response, appreciate it

[helenmarkerine]

Gracias!