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ChE 150B
Problem Set 10
Due October 29, 2010
Problem 1
.
(30 Points)
In the figure below, the heavier components in a slightly
superheated hydrocarbon gas are to be removed by absorption at 400 psia (2,760 kPa)
with a highmolecularweight oil. [The diagram below is for N=6 stages.]
Component
Kvalue @ 97.5
o
F
and 400 psia
C
1
6.65
C
2
1.64
C
3
0.584
nC
4
0.195
nC
5
0.0713
Oil
0.0001
(a) Estimate the exit vapor flow rate, exit liquid flow rate, and exit compositions for
vapor and liquid streams by the approximate group method of Kremser for the
following number of stages of N=1, 3, 6, 10, and 30 stages. Assume that effective
absorption and stripping factors for each component can be estimated from the
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View Full Documententering values of L, V, and the component Kvalues, as listed based on an average
entering temperature of (90+105)/2=97.5
o
F.
(b) Plot the percent absorption of each of the five hydrocarbons and percent
absorption of the total feed gas versus the number of stages, N.
(c) What can you conclude about the effect of the number of stages on each
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 Fall '10
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