Question

Evaporator – Crystallizer

Fresh feed containing 20% by weight KNO3 in H2O is combined with a recycle stream and fed
to an evaporator. The concentrated solution leaving the evaporator, containing 50% KNO3, is
fed to a crystallizer. The crystals obtained from the crystallizer are 96% KNO3 and 4% water.
The supernatant liquid from the crystallizer constitutes the recycle stream and contains 0.6 kg
KNO3 per 1.0 kg of H2O. Complete the mass balance showing all stream values and
compositions.

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