In the commercial production of sugar (sucrose), the product crystals are washed and centrifuged to partial dryness. the crystals are then sent through a rotary dryer where they are contacted with a hot stream of air that reduces the moisture content from 1.10 wt% to 0.100 wt%. the ratio of wet sugar to inlet air fed to the dryer is 3.30 kg wet sugar/kg inlet air. the inlet air contains 1.45 mole% water.

take as a basis 100.0 kg of wet sugar fed to the dryer. calculate the following.

the mole fraction of water in the air leaving the process:

if 1400 tons/day of of sugar containing 0.100 wt% water is to be produced, at what rate (lbm/h) is water evaporated from the feed stream of wet sugar?