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Separation Process Engineering, Second Edition by Phillip C. Wankat

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Answers to Selected Problems

Chapter 2

2D1. a. y=0.77, x= 0.48

b. V=600 and L = 900

c. V/F = 0.25, y = 0.58

d. F = 37.5 kmole/hr

e. D = 1.705 feet. Use 2.0 feet. L ranges from 6 to 10 feet

f. V/F = 0.17

2.D2. Hint: Work backwards (start with stage 2).

a. (V/F)1 = 0.148

b. x1 = 0.51, y1 = 0.78, x2 = 0.25, y2 = 0.62

2.D8. V/F = 0.076, xmethane = 0.0077, xpropane = 0.0809

2.D9. Tdrum ~ 88.2°C, xE = 0.146, yE = 0.617, V = 326.9

2.D13. a. Tdrum ~ 86°C, xC6 = 0.52, yC6 = 0.85

b. D = 10.96 feet. Use 11.0 feet

2.D15. zethane = 0.4677, znC4 = 0.2957

2.D18. Tdrum ~ 65.6°C, V/F ~ 0.57

2.D19. Tdrum ~ 57°C, V/F = 0.293

2.F2. x3 = 0.22, y3 = 0.461

2.F3. Tdrum ~ 57.3°C, V/F = 0.513

Chapter 3

3.D2. L/D = 2.77

3.D3.

3.D5. B = 76.4 kg/min, D = 13.6 ...

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