Question: an equimolar mixture of benzene and toluene is fed into...

 An equimolar mixture of benzene and toluene is fed into a distillation tower with a flow rate of 150 mol/s.  

The vapor leaving the top of the column (stream A) contains 95% benzene.

The stream leaving the condenser is fed to a valve, and 1/3 of this stream is returned to the column (stream B)  and the remainder is withdrawn as the distillate stream (stream C).

The distillate stream (stream C) contains 80% of the benzene that is fed to the column in stream F.

The liquid stream leaving the bottom of the tower (stream D) is fed to a reboiler, where 40% of the  reboiler feed is vaporized and recycled to the column (Stream E), while the other 60% is withdrawn as the bottoms product (Stream G).  

The ratio of the mole fraction of benzene in the vapor stream E to that in stream G is given is 1.50.  
Calculate the following;  show all your work on the next page.

Stream A:  molar flow rate:___________mole/s

    Stream B:  molar flow rate:___________mole/s

   

Stream C:  molar flow rate:___________mole/s

Stream D:  molar flow rate:___________mole/s;   mole fraction of benzene:___________

Stream E:  molar flow rate:___________mole/s;    mole fraction of benzene:___________

Stream G:  molar flow rate:___________mole/s;    mole fraction of benzene:___________

When writing equations, identify the unit operation, and species that is being balanced, or the name of the type of equation.

a)  Completely label the flow chart.