An evaporator is concentrating solutions from the two different sources. The solution from the first source containing 20% NaCl and 15% NaOH, flows at the rate of 40 kg/min. The other solution...

An evaporator is concentrating solutions from the two different sources. The solution from the first
source containing 20% NaCl and 15% NaOH, flows at the rate of 40 kg/min. The other solution
containing 8% NaCl and 12% NaOH flows at the rate of 70 kg/min. The two streams are fed
directly to the evaporator. In this process, 60% of the water evaporated. In order to obtain the
desired concentration, 80% of NaOH and 65% of NaCl were recycled. However, 20% of H2O was
mixed on the recycle stream; to avoid this, purging of H2O must be done. If 30 % of the remaining
water goes to the purge and the rest to the product, calculate the composition of NaOH and NaCl in
the recycle stream and the product in the evaporator.

the prodcut in the evaporator will be after the mixting with recylcing and after evaporataion