Question $1$:

Consider the four$-$unit separation train shown in the figure below. The process has been designed to separate a hydrocarbon feed containing $20\%C{H}_4,25\%C_{2}H,40\%C_{3}Hs.$ and the rest all in mol$\%)$ into five fractions. The process is designed so that the recycle to unit $1$ is $50\%$ of the bottoms from unit II$.$

$1\mathrm{.}1)$ Draw the block diagram for the above process and then do a degree of

$[15]$

froedom analysis to determine if the problem is correctly defined.

$2\mathrm{.}2)$ From your DFA results, show that if you assume a flowrate associated

$[5]$

with the spitter $($unit V$),$ then one can start solving the problem at this unit. Using this information, propose a plausible sequence for detormining all the uniknowns associated with the system.

$3\mathrm{.}3)$ Using the sequence of solving the problem derived in $(2\mathrm{.}2),$ determine all

$20$

flow rates and compositions of all streams associated with unit III.