1) Can you find out the reflux ratio required for 0.95 purity?
   Follow the procedure I explained just now
   It is approximately 2.067

2) In the previous assignment, include a second dependent variable: benzene mole fraction in the bottoms
   Observe both distillate and bottoms compositions
   Find out how to plot two profiles using Chart

3) Verify if the reflux ratio of 2.067 that we saw in assignment 1 will work
   For this, start with rigorous.dwxml once again
   Change the reflux ratio to 2.067
   Simulate
   What distillate composition do you get?

4) Supposing that I want 0.96 benzene mole fraction in the distillate
   What reflux ratio is required?
   As in the problems we solved, you may change only the reflux ratio
   Solve this first by Sensitivity Analysis
   Check your calculations with Adjust

5) Find the highest distillate purity you can get in this column
   You may vary the reflux ratio only, as in the earlier assignments
   I could go up to a mole fraction of 0.99,by proceeding gradually