It Is Desired to Concentrate a 20% Salt Solution (20

question 21

Multiple Choice

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

• A)3.06 × 10 ⁵
• B)6.12 × 10 ⁵
• C)7.24 × 10 ⁵
• D)9.08 × 10 ⁵

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