SCHOOL OF CHEMICAL ENGINEERING
CEIC3001 Advanced Thermodynamics and Separation
Tutorial 1
Question 1
a)
Using the vapour pressure data below, construct a
Txy
diagram for the binary
system consisting of benzene (1) and toluene (2) at a total pressure of 1 atm (760
mmHg).
It can be assumed that the system conforms to Raoult's law.
Explain the
procedure for constructing the
Txy
diagram.
Provide some sample
Txy
data in a
table.
Include labels showing the bubblepoint and dewpoint curves.
b)
Calculate the bubblepoint of a subcooled liquid mixture containing 65 mol%
benzene and 35 mol% toluene.
Specify the type of VLE calculation required in
your answer and show all working and relevant equations.
c)
What is the composition of the first bubble of vapour formed at the bubblepoint of
the liquid mixture in part (b)?
Pure component vapour pressure data (mmHg)
sat
i
P
60
100
200
400
760
1520
T
2
(
C)
40.3
51.9
69.5
89.5
110.6
136.5
T
1
(
C)
15.4
26.1
42.2
60.6
80.1
103.8
Assume that a linear relationship exists between ln
sat
P
and reciprocal temperature (K
1
).
Question 2
a)
Assuming Raoult's law to be valid, prepare a
Pxy
diagram for a temperature of
60
C and a
Txy
diagram for a pressure of 100 kPa for the
n
pentane (1)/
n
heptane
(2) binary system.
Explain the procedure for constructing each type of diagram.
Provide some sample
Pxy
and
Txy
data in a table.
Include labels showing the
bubblepoint and dewpoint curves.
b)
Using the diagrams constructed in part (a), determine the following: BUBL
P
at
x
1
= 0.4, DEW
P
at
y
1
= 0.9, BUBL
T
at
x
1
= 0.2, and DEW
T
at
y
1
= 0.9.
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Question 3
A soft drink manufacturer is trying to develop a new type of soda water containing 2
wt% CO
2
when it is sealed under pressure at a temperature of 10°C.
The manufacturer
proposes to package this soda water in a plastic bottle.
The burst pressure of the plastic
bottle is rated at 5 bar.
Assuming that the soda water contains only CO
2
and water, is
the plastic bottle suitable for this type of soda water?
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 piere
 Partial Pressure, Vapor pressure, Txy diagram

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