9873

Evaporative Crystallization with Recycle

This Demonstration shows a model for the evaporative crystallization process. A mixture of a fresh feed and recycle stream, both containing potassium chloride (KCl) in water, enter an evaporator. A fraction of the water that enters the evaporator exits as vapor, and the remaining KCl solution enters a crystallizer and filter. A filter cake and a portion of saturated KCl solution are removed from the crystallizer and filter, and the rest of the aqueous KCl solution is recycled by mixing it with the fresh feed. The fraction of crystals out of solution in the stream exiting the crystallizer and filter can be varied. The temperature of the evaporator as well as the temperature of the crystallizer and filter can be varied. The solubility of KCl increases linearly with temperature.

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DETAILS

Overall material balances
= mass flow rate of fresh feed ()
= mass flow rate of water exiting evaporator ()
= mass flow rate of slurry exiting the crystallizer and filter ()
= mass fraction of water in fresh feed
crystals = mass fraction of KCl in saturated solution
= mass fraction of water in solution exiting crystallizer and filter
Material balance around mixing point
= mass flow rate of recycle (kg )
= mass fraction of KCl in fresh feed
= mass fraction of KCl in recycle stream
Material balances around crystallizer and filter
= mass fraction of KCl in solution exiting crystallizer and filter
Material balances around evaporator
= mass flow rate entering evaporator ()
= mass flow rate of solution exiting evaporator ()
= mass fraction of KCl in stream entering evaporator
= mass fraction of KCl in stream exiting evaporator
Dependence of solubility on temperature
= solubility of KCl in 100 kg
= operating temperature of evaporator ()
= solubility of KCl in 100 kg
= operating temperature of crystallizer and filter ()
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