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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.

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