Answers to Selected Odd-Numbered Exercises in
“Separation Process Principles” by
J. D. Seader and Ernest J. Henley
Chapter 10
10.5 x1 =-100/6, x2 = -100/3, x3 = -100/3, x4 = -100/3, x5 = -100/3
10.7 Yes
10.9 (a) x1 = 1.0, x2 = 4.0 (b) method fails (c) method fails (d) method fails
10.11 Normalized liquid-phase mole fractions:
Comp. Stage 1 Stage 2 Stage 3 Stage 4 Stage 5
1 0.772 0.622 0.473 0.315 0.178
2 0.176 0.246 0.280 0.293 0.259
3 0.052 0.132 0.247 0.392 0.563
Temp,C 68 70 73 77 82
10.13 Matrix structure is still block tridiagonal.
10.39 Using ChemCAD with TOWR and SRK for properties. Assuming lean oil is nC12.
Flow rate, lbmol/h: Component Lean gas Rich oil
C1 305.30 67.70
C2 10.62 32.38
C3 0.19 28.81
nC4 0.002 18.998
nC5 0.0 15.0