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1
PGE 312 – SPRING 2004
Physical and Chemical Behavior of Petroleum Fluids I
Test #2, 50 Minutes
Closed Book
Note: It will be in your best interest to attempt all the questions. Please budget your time
accordingly.
1.
(
30 points
) Twenty one (21) milli moles of propane and 29 milli moles of
isopentane are charged into a PVT cell at T = 167
°
F and P = 147 psia. The
equilibrium ratios (kvalues) for the propane and the isopentane at the given
conditions are as follows:
k
3
= 2.18
k
5
= 0.48
a.
Perform appropriate calculations to confirm that two phases are present in
the PVT cell. Please show the results of your calculations to get credit.
b.
Calculate the milli moles of liquid in the cell.
c.
Calculate the liquid composition in mole fractions.
Please note that a trial and error procedure is not required to solve this problem.
You may find the following equations for a binary system
of components A
and B helpful:
x
A
=
1 – k
B
k
A
– k
B
(1)
y
A
=
k
A
x
A
(2)
n
g
n
=
z
A
– x
A
y
A
– x
A
(3)
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 Spring '10
 Peters

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