Acetic acid is continuously 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/k, respectively. Assuming a residence time of 1.5 min in the mixer and a settling vessel capacity of 4 gal/min-ft2, estimate:
(a) Diameter and height of the mixing vessel, assuming H / DT = 1,
(b) Agitator horsepower for the mixing vessel,
(c) Diameter and length of the settling vessel, assuming L / DT = 4, and
(d) Residence time in minutes in the settling vessel.