subject - unit operation

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QUESTION 2 [30 MARKS A feed consisting mixture of hydrocarbons according to the composition shown in Table 2 is to be separated by distillation at atmospheric pressure. The recovery of n-heptane in the distillate is 99.1% and 98.7% n-octane is recovered at the bottom. The system is operating with partial reboiler and total condenser and the feed introduced to the tower at a saturated vapour condition. The K value for the component can be determined from the given De Priester Chart in the Appendix A a) Determine the average temperature of the column if the K value for the heavy key component is 0.7. Then, calculate the minimum number of stages at total reflux. (Hint: You can use the average temperature for all calculations involve in the shorteut method) (13 Marks) 2 CONFIDENTIAL BKC/20211/BKF3463 b) Determine the number of theoretical stages and the location of feed tray at the operating reflux ratio R of 1.5 min (12 Marks) c) Predict any changes happen to the number of stages if the reflux ratio is decrease to 1.2 Rim and justify your answer. (5 Marks) Table 2: The flowrate of components in feed stream Feed (kmol/h) n-pentane 11.8 n-hexane n-heptane 11.3 7.7 n-octane -nonane 10.4 QUESTION 2 [30 MARKS A feed consisting mixture of hydrocarbons according to the composition shown in Table 2 is to be separated by distillation at atmospheric pressure. The recovery of n-heptane in the distillate is 99.1% and 98.7% n-octane is recovered at the bottom. The system is operating with partial reboiler and total condenser and the feed introduced to the tower at a saturated vapour condition. The K value for the component can be determined from the given De Priester Chart in the Appendix A a) Determine the average temperature of the column if the K value for the heavy key component is 0.7. Then, calculate the minimum number of stages at total reflux. (Hint: You can use the average temperature for all calculations involve in the shorteut method) (13 Marks) 2 CONFIDENTIAL BKC/20211/BKF3463 b) Determine the number of theoretical stages and the location of feed tray at the operating reflux ratio R of 1.5 min (12 Marks) c) Predict any changes happen to the number of stages if the reflux ratio is decrease to 1.2 Rim and justify your answer. (5 Marks) Table 2: The flowrate of components in feed stream Feed (kmol/h) n-pentane 11.8 n-hexane n-heptane 11.3 7.7 n-octane -nonane 10.4