Chapter 1, Problem 1.6P

An evaporator is fed continuously with 25 t (metric tons)/h of a solution consisting of 10 percent NaOH, 10 percent NaCl, and 80 percent ${\text{H}}_2\text{O}$. During evaporation, water is boiled off, and salt precipitates as crystals, which are settled and removed from the remaining liquor. The concentrated liquor leaving the evaporator contains 50 percent NaOH, 2 percent NaCI, and 48 percent ${\text{H}}_2\text{O}$.

Calculate (a) the kilograms of water evaporated per hour, (b) the kilograms of salt precipitated per hour, and (c) the kilograms of concentrated liquor produced per hour. Answers: (a) 17,600 kg/h; (b) 2,400 kg/h; (c) 5,000 kg/h