Feed Distillate Bottoms (Stream 5) (Stream 6) (Stream 7) Phase condition Liquid Liquid Liquid Temperature, K Pressure, kPa 348 323 343 1,950 700 730 Enthalpy, kJ/mol Entropy, kJ/kmol-K 17,000 13,420 15,840 25.05 5.87 21.22
Second-law analysis of a distillation.
Column C3 in Figure 1.8 separates stream 5 into streams 6 and 7, according to the material balance in Table 1.5. The separation is carried out at 700 kPa in a distillation column with 70 plates and a condenser duty of 27,300,000 kJ/h. Using the following data and an infinite surroundings temperature T0, of 298.15 K, compute: (a) the duty of the reboiler in kJ/h; (b) the irreversible production of entropy in kJ/h-K, assuming condenser cooling water at 25oC and reboiler steam at 100oC; (c) the lost work in kJ/h; (d) the minimum work of separation in kJ/h; and (e) the second-law efficiency.
Assume the shaft work of the reflux pump is negligible.
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