In this problem set you are given ternary systems (translation: three chemicals) that form two immiscible liquids phases. One phase (the solvent) will be used to extract a third chemical (the solute) from the other phase (the diluent) in a multi-stage column.

19.1 100 mol/min of methanol with 15 mol% benzene is extracted with 100 mol/min of pure heptane at 20^{o}C. The benzene composition should be reduced to about 1.5 mol%.

a. You may have already done this part in problem 17.1 or 18.1. If so, skip to part b. Construct an LLE graph with benzene mole fraction on the ordinate (y-axis) and methanol on the abscissa (x-axis). For your convenience, the data and a formatted graph are found in Excel "MBH Data" below.

b. Find the number of required stages and compositions of all streams using the Hunter-Nash method. You should find that two stages is sufficient.

c. Use mole balances to find the amounts of each stream.

d. Your results should be similar to problem 18.1. Compare the methods.

Why this system? See problem 17.1.

^{o}C in an extraction column. The benzene composition should be increased to about 94.8 mol%. How many stages are required?

a. You may have already done this part in problem 17.2 or 18.2. If so, skip to part b. Construct an LLE graph with ethanol mole fraction on the ordinate (y-axis) and benzene mole fraction on the abscissa (x-axis). For your convenience, the data and a formatted graph are found in Excel "BEG Data" below.

b. Find the number of required stages and compositions of all streams using the Hunter-Nash method. You should find that three stages is sufficient.

c. Use mole balances to find the amounts of each stream.

d. Your results should be similar to problem 18.2. Compare the methods.