Question: Solid calcium carbonate (CaCO 3 ) is obtained by an evaporation and crystallization process from the aqueous solution of its salt. The fresh feed to
Solid calcium carbonate (CaCO3) is obtained by an evaporation and crystallization process from the aqueous solution of its salt. The fresh feed to the process contains 17.8 wt. % CaCO3. The output of the crystallizer consists of solid CaCO3 crystals and 35 wt. % CaCO3 solution. The ratio of the crystal weight to solution weight at the crystallizer outlet is 12. The filtrate of the crystallizer which is also a 35 wt. % CaCO3 solution is recycled to join fresh feed to the evaporator. In the evaporator, 53 % of the water in the feed to the evaporator is evaporated and the maximum capacity of the evaporator is 192 kg water/min. Calculate the steady-state molar flow rate (kmol/min) and molar composition of the outlet stream from the evaporator which contains CaCO3 and water together when the evaporator is working at 85 % of its maximum capacity.
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