Answers to Selected Odd-Numbered Exercises in
“Separation Process Principles” by
J. D. Seader and Ernest J. Henley Chapter 4
4.1 (a) For each of 7 streams: total flow, T, P, and C mole fractions. Also, the rate of heat transfer, Q.
Total of 7C + 22 variables. (b) C component material balances 1 energy balance
(d) For each of 4 entering streams, specify: total flow, T, P, and C - 1 mole fractions. Specify also one exit pressure and Q.
Specifications other than Q are possible, e.g. one exit temperature.
4.3 (a) 3C + 9 (c) 2C + 6 (d) C +3
(e) All feed conditions plus exit pressure. 4.5 4
Fix temperature, pressure, & mole fractions of oxygen and argon in the air. 4.7
4.13 Temperature of azeotrope = 53.5oC
Composition of azeotrope = 65 mol% chloroform minimum-boiling azeotrope
(c) 50 mol% isopropanol in vapor 14 mol% isopropanol in liquid (d) At 80oC, no vapor
At 89oC, K of isopropanol = 10, K of water = 0.67, = 15
4.19 21% of benzene is vaporized
4.27 126 psia
4.45
Solvent kg/h
MeAc 74,000
IPE 222,000 Hd 305,000 CHCl3 535,000
4.49 (a) 131 kg of extract with 9 wt% A, 3 wt% W, and 88 wt% E 89 kg of raffinate with 20 wt% A, 77 wt% W, and 3 wt% E
Ether-free extract is 75 wt% A and 25 wt% W
(b) 85 kg of raffinate with 36 kg of A, 43 kg of W, 6 kg of E
4.53 Overflow is 3,210 kg/h of 25.2 wt% carbonate
Underflow is 2,400 kg/h of solid oxide, and 2,140 kg/h of liquid containing 25.2 wt% carbonate
4.55 2,280 lb/h of naphthalene crystals
3,720 lb/h of mother liquor containing 35.5 wt% naphthalene 4.57 3,330 kg/h of benzene crystals
6,670 kg/h of mother liquor containing 85 wt% benzene
4.59 3,800 kg of added water
4.61 (a) qB = 0.69cB0 504.
