We want to remove acetic acid from water with 1-butanol, with LLE data given in the graph on the next page. The inlet water again contains 2.0 wt% acetic acid with a total flowrate of 250 kg/h. The inlet 1-butanol contains 0.05 wt% acetic acid with a flowrate of 200 kg/h. We again want the outlet water stream to have less than 0.05 wt% acetic acid. Assume dilute streams with negligible flowrate changes.

a. What is the minimum 1-butanol mass flowrate?

b. How many stages are needed?

c. What is the outlet weight percent of acetic acid in the 1-butanol stream?

d. If we contact these two flowrates in a single stage instead of a multistage cascade, what will be the outlet weight percent of acetic acid in the 1-butanol and water streams?