4500 kg/h of a solution that is 1/3 K2CrO4 by mass is joined by a recycle stream containing 36.4 % K2CrO4, and the combined stream is fed into an evaporator. The concentrated stream leaving the evaporator contains 49.4% K2CrO4, and is in turn fed into a crystallizer in which it is cooled. The cooling causes crystals of K2CrO4 to precipitate. The crystals are then filtered out of the solution. The “filter cake” consists of K2CrO4 crystals and a solution that contains 36.4 % K2CrO4 by mass, such that the crystals account for 95% of the total mass of the filter cake. The “filtrate” solution that passes through the filter also contains 36.4 % K2CrO4, and is recycled. Determine the following: a) Mass rate of evaporation b) Mass rate of production of K2CrO4 crystals c) Mass feed rates that the evaporator and the crystallizer must handle
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1. 4500 kg/h of a solution that is 1/3 K2CrO4 by mass is joined by a recycle stream containing 36.4 % K2CrO4, and the combined stream is fed into an evaporator. The concentrated stream leaving the evaporator contains 49.4% K2CrO4, and is in turn fed into a crystallizer in which it is cooled. The cooling causes crystals of K2CrO4 to precipitate. The crystals are then filtered out of the solution. The “filter cake” consists of K2CrO4 crystals and a solution that contains 36.4 % K2CrO4 by mass, such that the crystals account for 95% of the total mass of the filter cake. The “filtrate” solution that passes through the filter also contains 36.4 % K2CrO4, and is recycled. Determine the following:
a) Mass rate of evaporation
b) Mass rate of production of K2CrO4 crystals
c) Mass feed rates that the evaporator and the crystallizer must handle
d) Recycle ratio. The recycle ratio = (mass of recycle)/(mass of fresh feed).
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