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3 A ) . In a process producing crystalline potassium nitrate ( K N O 3 ) salt, 1 0 0 0 k g h

3A). In a process producing crystalline potassium nitrate (KNO3) salt, 1000kgh of a feed solution containing 20wt%
KNO3 is fed to an evaporator which evaporates Wkgh water at 422K to produce a 50wt%KNO3 solution at a mass
flow rate of Sgh. This concentrated (supersaturated)KNO3 solution is then fed to a crystalliser at 311K, where
crystals containing 96wt%KNO3 is removed. The resulting spent solution (R) containing 37.5wt%KNO3 is recycled
to the evaporator. The flow diagram of the entire process is described in Figure 3A below.
Calculate the mass flow rates of the evaporated water W, the concentrated solution S, recycle stream R and the
products stream of crystals P in kgh. State all assumptions made.
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