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500 kg/h containing 10% NaOH by weight in an atmosphere of 101.3 kPa atmospheric pressure Aqueous NaOH solution at the flow rate until it contains 50 wt% NaOH in a standard type evaporator. is evaporated. The boiling temperature of the solution in the evaporator is 379 K. of the evaporator The heat capacity of the overheated water vapor leaving the separator part is 1,926 kJ/kg.K. Since the temperature difference (T) applied in the evaporation process is 29 K, appropriate assumptions are made. by doing;

a) The pressure (P_sep) in the separator part of the evaporator and the applied vacuum (kPa), b) Boiling point elevation of the evaporated solution, c) the pressure of saturated steam used for heating (kPa), and d) Calculate the enthalpy (kJ/kg) of the superheated solvent vapor leaving the evaporator.