SOLVED: The concentration of NaOH solution leaving the third effect of a triple-effect evaporator is 50wt %

 Water Consumption and Pressure in Barometric Condenser.

The concentration of NaOH solution leaving the third effect of a triple-effect evaporator is 50wt %. The vapor flow rate leaving is 5670 kg/h and this vapour goes to a barometric condenser. The discharge water from the condenser leaves at 40.5°C. Assuming that the condenser can maintain a vacuum in the third effect corresponding to a saturated vapour pressure of 2.78°C above 40.5°C, calculate the pressure in the third effect and the cooling water flow to the condenser. The cooling water enters at 29.5°C.

(Note: The vapor leaving the evaporator will be super heated because of the boiing-point rise.)

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