Question 5

A spent dye sample obtained from a soap-making unit contains 7.6% glycerol and 9.3% salt. It is concentrated at a rate of 5000 kg/h in a double effect evaporator until the solution contains 85% glycerol and 5% salt. Assume that 5% glycerol is lost by entrainment. Find:
(a) the amount of salt crystallized out in the salt box of the evaporator
(b) the evaporation taken place in the system