It is desired to concentrate a 20% salt solution (20 kg of salt in 100 kg of solution) to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min at 30°C. The boiling point of the solution is 110°C, the latent heat of vaporisation is 2100 kJ/kg and the specific heat of the solution is 4 kJ/kg.K. The rate at which the heat has to be supplied in (kJ/min) to the evaporator is____________________?
Correct answer: A. 3.06 x 10^5
- A. 3.06 x 10^5
- B. 6.12 x 10^5
- C. 7.24 x 10^5
- D. 9.08 x 10^5
Explanation
Salt in the feed is 300(0.20) = 60 kg/min, so the concentrated product is 60/0.30 = 200 kg/min and water evaporated is 100 kg/min. The heat duty is 300(4)(110−30) + 100(2100) = 306,000 kJ/min.
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