# Calculate Rate Of Water Evaporation In The Evaporator

Question

Amino-Fluorescein (AF, molecular weight=347g/mol) is to be recovered from a 20wt% aqueous solution in a continuous crystallization operation. The solution is joined by a recycle stream and fed to a vacuum evaporator where water is removed and the remaining solution is cooled to 30°C, at which temperature the solubility of the fluorescein is 0.15 kg AF/kg H2O. The solution and suspended AP crystals flow to a centrifuge. The crystals and 4.0% of the solution (that entered the centrifuge) constitute the solid effluent from the centrifuge, and the remaining solution is recycled to the evaporator. The solid effluent, which contains 92 wt% crystals and 8% entrained solution, is fed to a dryer, where it is contacted with dry hot air. The remaining water in the effluent is evaporated, leaving pure AF. The air leaves the dryer at 95C and 1atm with a dew point of 39°C. For a production rate of 1000 kg solid AF/h, calculate: The rate of evaporation of water in the evaporator (kg/h)

Summary

The question belongs to Chemistry and it discusses about calculating the rate of evaporation of water in the evaporator. This has been discussed in the solution detail.

Total Word Count 33

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