5,000 kg/h of a 10 wt% aqueous sugar solution at its boiling point is fed to a single effect evaporator. The evaporator operates at standard atmospheric pressure. Heat is supplied by saturated steam at 125C. The liquid product contains 20 wt% sugar. The boiling point rise, in C, is given by: BPR = 1.78x + 6.22x2. The heat capacity of the liquid, in kJ/kgK, is given by: cp = 4.19 2.35x. Where x is the weight fraction of sugar. How much steam is used and what is the steam economy?

Mass Transfer