Information Technology Reference
In-Depth Information
FEED
MIX
A
HEAT1
B
REACT
C
HEAT2
G
SEP1
D
E
PROD
EXTRCT
F
RCYCL
Figure 10.26
Toluene process sketch.
The conversion based on
n
-heptane is 15%. The products of reaction are cooled to
180
◦
F, after which the hydrogen is completely separated from the reactor products in
the first separator. A feed of 100 lbmol/hr of benzene at 180
◦
F and 1 atmosphere is
combined with the remaining products of reaction to extract the toluene. All of the
toluene and benzene leave as the product of the process. The unreacted
n
-heptane is
recycled to the mixer. A sketch of the process is given in Figure 10.26. Using the
RStoic model for the reactor, calculate the complete material and energy balance.
Workshop 10.3a
Production of hydrogen from methanol
involves two steps,
methanol re-forming and the shift reaction:
CH
4
O
→
2H
2
+
CO
CO
+
H
2
O
→
H
2
+
CO
2
Using an REquil block, find the temperature that maximizes hydrogen formation by
re-forming at 1 atmosphere.
Workshop 10.3b
Repeat Workshop 10.3a using a RGibbs block. Compare the
results.
Workshop 10.3c
Using 450
◦
F as the operating temperature, determine the effect of
pressure on the reaction. Select the optimal operating conditions. Is there a problem
with this analysis?
Workshop 10.3d
Choi and Stenger (2002) have suggested that there is a possibility
that dimethyl ether and methyl formate may be side products of the re-forming and
shift reactions in Workshop 10.3a. Assess this possibility using the RGibbs block at
450
◦
F and a variety of pressures.
Workshop 10.4
The formation of chlorobenzene as described at Examples/RPlug1
Example in Section 10.8 is not limited to chlorobenzene formation but has the possi-
bility of forming both
p
-dichlorobenzene and trichlorobenzene. Belfiore (2003) reports
that the relative rates of reaction of the dichloro- and trichlorobenzen relative to the
monobenzen are 1/8 and 1/243, respectively. Determine the quantities of the minor
products formed for the conditions of RBatchExample1.
