Question $,$ C$4]$

An evaporator$-$crystallizer system is designed to produce $20k\frac{g}{h}$ of salt crystals. A fresh feed mixes with a recycle stream and the combined stream, which is $30wt\%$ salt, is fed to an evaporator. Leaving the evaporator is a solution that is $45$ wt$\%$ salt. This stream is fed to a crystallizer which produces a filter cake. The filter cake consists of some of the solution $($which is $35$ wt$\%$ salt$)$ from the crystallizer as well as pure crystals. The rest of the solution is recycled back to join the fresh feed. If $25\%$ of the solution from the crystallizer exits with the filter cake:

a$)$ Draw and completely label the block diagram for the process

$[2$ marks$]$

b$)$ the ratio of the crystals to solution in the exiting stream

$[10$ marks$]$