Homework Set No. 3 ChE 363 Summer 2013 R.B. Eldridge

Problem No. 1

Text Problem 6.8

Problem No. 2

Text problem 6.11

Problem No. 3

Text problem 6.13 (Aspen solution only)

Problem No. 4 (in class exercise)

By means of a packed column, acetone is being absorbed from air into a nonvolatile absorption oil. The

entering gas contains 25 mol % acetone. The absorption oil contains 1.5 mol % acetone. The exiting liquid

contains 8 mol % acetone, with the total acetone absorbed equal to 80 percent.

a) Using the Stichlmair model, determine the tower diameter at 80% of flood.

b) Using the Onda mass transfer model, determine the packed tower height {Spreadsheet Problem}

Data:

Equilibrium relationship : y = 2.5 x

Tower pressure = 1 atm.

Packing description = # 25 metal Pall rings

Gas rate = 100 lbmols / hr

MWt of oil = 110 lb/lbmol

Temp of column = 100 F

Density of liquid = 40.6 lb/ft3

Density of gas = 0.0888 lb/ft3

Viscosity of liquid = 0.7 cP

Viscosity of gas = 0.018 cP

Surface tension (oil/air) = 45 dyne/cm

NOTE: - Assume plug flow of vapor and liquid