UNIT OPERATIONS I$/$Midterm Exam

QUESTION ONE: Stripping

For a gas stripping column, the liquid feed enters at $100$kmo$\frac{l}{h}$ and a concentration of $0\mathrm{.}40$mol fraction A$,$ where A is the solute transferred. The liquid concentration on exiting the column is $0\mathrm{.}04$ mol fraction A$.$ The vapour enters the column pure. The equilibrium distribution of A between the vapour and liquid phases $($on mole fraction basis$)$ is given in Figure Q$1.$ You may assume that only one solute $(A)$ is transferred.

a$)$ Draw a sketch of the process including all known and unknown values.

b$)$ What is the minimum vapour mole rate required to achieve separation? Show any construction on Figure Q$1.$

c$)$ If the vapour exits at $0\mathrm{.}055$mol fraction,

i$)$ How many ideal stages are required in the column? Show any construction on Figure Q$1.$

ii$)$ How many real stages are required in the column if the overall efficiency is $50\%?$

iii$)$ If this was a packed column and the HETP was known for this column to be $0\mathrm{.}6m,$ then what height of packing would be required?