Acetic acid is extracted from a 3 wt% dilute solution in water with a solvent of isopropyl ether in a mixer-settler unit. The flow rates of the feed and solvent are 12,400 and 24,000 lb/h, respectively. Assuming a residence time of 1.5 minutes in the mixer and a settling vessel capacity of 4 gal/minute-ft², estimate: 

(a) Diameter and height of the mixing vessel, assuming H/DT = 1; 

(b) Agitator horsepower for the mixing vessel; 

(c) Diameter, length, and residence time in minutes of the settling vessel, assuming L / DT = 4.