1.9b. Water balance around a soap dryer.
It is desired to dry 10 kg/min of soap continuously from 17% moisture by weight to 4% moisture in a countercourrent stream of hot air. The air enters the dryer at the rate of 30.0 m3/min at 350 K, 101.3 kPa, and initial water-vapor partial pressure of 1.6 kPa. The dryer operates at constant temperature and pressure.
a) Calculate the moisture content of the entering air, in kg of water/kg of dry air.
Solution
b) Calculate the flow rate of dry air, in kg/min.
Solution
c) Calculate the water-vapor partial pressure and relative humidity in the air leaving the dryer.
Solution
Calculate water vapor pressure at 350 K
Antoine equation for water vapor: