In a distillation operation, what is the effect of the temperature of the reflux stream (given below) on the condenser and reboiler loads? Reflux conditions: (i) Reflux stream is completely liquid and is at its bubble point. (ii) Reflux stream is below its bubble point ?
Correct answer: D. Both condenser and reboiler loads are higher in case (ii) as compared to case (i)
- A. Condenser and reboiler loads are the same in both the cases
- B. Reboiler load is the same in both the cases but condenser load is higher in case (ii)
- C. Condenser load is the same in both the cases but reboiler load is higher in case (ii)
- D. Both condenser and reboiler loads are higher in case (ii) as compared to case (i)
Explanation
Subcooled reflux must first be heated to its bubble point, increasing the reboiler duty, while the condenser must remove extra sensible heat to produce the colder reflux. Therefore, both loads are higher when the reflux is below its bubble point.
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