Answers to Selected Odd-Numbered Exercises in
“Separation Process Principles” by
J. D. Seader and Ernest J. Henley
Chapter 8
8.11 (a) 190 kg/h (b) approx. 7 (c)
Acetone mole fraction Flow rate from stage, kg/h
Stage Raffinate Extract Raffinate Extract
1 0.42 0.545 1025 724
2 0.37 0.50 891 749
3 0.325 0.445 794 615
4 0.28 0.39 702 518
5 0.235 0.33 630 426
6 0.18 0.26 592 354
7 0.10 0.16 561 316
8.15 approx. 5 theoretical stages and 195 kg/h of DPH in extract at 45oC
8.25 (a) 2.85 ft each (b) 0.54 hp
(c) 2.4 ft diameter, 9.6 ft length (d) 3.6 min.