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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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D. Problems

*Answers to problems with an asterisk are at the back of the book.

D1.* Repeat Example 11-1 except at a pressure of 700 kPa. At this pressure Eo = 0.73, D = 9 ft, and the relative volatility will be a function of pressure.

a.* Find (L/D)min.

b.* Find Nmin.

c.* Estimate Nequil.

d.* Estimate Nactual.

e.* Find cost of shells and trays as of Sept. 2001.

f. Update cost of shells and trays to current date.

D2.* Estimate the cost of the condenser and reboiler (both fixed tube sheet, shell and tube) for the distillation of Example 11-1. Pressure is 101.3 kPa. CPL,C7 = 50.8 Btu/(lbmol– °F), λC7 = 14,908 Btu/lbmol. Data for hexane are given in Problem 3.D6. The saturated steam in the reboiler is at 110°C. λsteam = 958.7 Btu/lb. Cooling water ...

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