Sample Problems On Gas Absorption
Sample Problems On Gas Absorption
Sample Problems On Gas Absorption
Acetone and Ethanol are separated using a distillation column with a partial
condenser and partial reboiler. An equimolar, sub-cooled liquid feed enters at 100
kmol/hr and condenses 1 mole of vapour for every 6 moles of feed. The separation
requires a distillate vapour that is 95 mol% acetone and bottoms liquid that is 5 mol
% acetone. The reflux is returned from the condenser to the column as saturated
liquid and the operation is run at (L/V) = 1.4*(L/V) min. Assume constant molar
overflow conditions.
A. Plot the operating lines for the rectifying and stripping sections of the feed line.
b. Determine the number of equilibrium stages required and number of trays if each
tray has an efficiency of 1.
c. Determine the optimal feed location.
d. Determine the molar flow rates in and out of the condenser (V and D) and boiler
(L and B).
X
Y
0
0
0.1
0.36
0.3
0.7
0.5
0.85
0.55
0.9
0.7
0.95
1
1
Enthalpy-Concentration Data
Mole
Fractio
n,
Hexan
e
Enthal
py,
Cal/gm
-mol
Satd
Liquid
Satd
Vapor
0.1
0.3
0.5
0.7
0.9
7000
6300
5000
4100
3400
3100
3000
15700
15400
14700
13900
12900
11600
10000