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Q-3 [6-marks] For the single-effect evaporator shown in the following figure, determine the specific enthalpies (in kJ/kg) of feed, liquid product and generated vapour. Feed temperature = 38 C and heat capacity of steam = 4.2 kJ/kg K. Heat of solution and boiling point elevation are not negligible for the aqueous NaOH solution. Vapour P=20 kPa abs. Feed 20% aqueous NaOH Saturated steam condensate Saturated steam at 150 kPa Thick liquor 40% aqueous NaOH