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2. Two hundred kilograms of wet leather is to be dried by heating. The wet leather enters the drier with 60% moisture and 90% of the water is removed. Draw the process flow sheet (2 marks) and then determine the mass fraction of the moisture content of the dried leather. (4 marks) Solution: Water, W = ? DL is dry leather 90% of the water is removed 3 unknowns (W, B,x) - 2 independent mass Feed, F-200 P-2 P-3 Dried leather, B kg balances kg wet leather Water I relation (90% of water is 60% Moisture (1-x) DL removed) 40% DL P-1 DF -0.0 Relation: 0.9(0.6* 200) = W W108 Kg Total balance: F-W+B 200 - 108 + B Water balance (moisture is water): 0.6(200) = 108 + x (92) B =92 Kg x = 0.13