. A spray-drying operation similar to that described in Problem 5.23 is used by the pharmaceutical industry. Acetaminophen is an active pharmaceutical ingredient (API) that can be produced in powdered form by spray drying. A mixture of the API containing 75 wt% water is fed to an atomizer in a dryer where it is brought into contact with hot air that enters the dryer at 220°C and 6.0 bar. All of the water is evaporated. The outlet gas contains 8.1 mole% water and leaves the dryer chamber at 80°C and 1.0 atm absolute with a flow rate of 513:6 m3 /h. Calculate the production rate of powdered API and the volumetric flow rate of inlet air.