Lab. # 3: Cyclohexane Production
Chemical Process Component Design
0906.401
THIS LAB IS DUE OCTOBER 12
SIMULATION OF A CYCLOHEXANE PLANT
Part 1: Solve the heat and material balances of the cyclohexane plant shown in the Figure below:
500 psig
C1
Recycle
S13
S12
Eff. 80%
S6
SP1
300 F
Purge Gas
S3
S11
E2
DP=15 psi
S7
R1
S4
BENZENE
120 F
S5
S1
HYDROGEN
M1
F1
E1
S10
S9
E3
Product
FEED STREAMS
COMP.\STREAM
BENZENE HYDROGEN
Hydrogen (mole %)
--
97.5
Methane (mole %)
--
2.5
Benzene (mole %)
100
--
Cyclohexane (mole %)
--
--
Temperature (F)
100
100
Pressure (psig)
0
500
Flowrate (bbl/hr)
100
Flowrate (std ft3/hr)
600,000
PROCESS CONDITIONS
Use SRK for your initial run.

Heat exchangers pressure drop = 5 psia. Reactor pressure drop = 15 psia.

Specify heat exchanger E-1 and E-2 as having cold stream outlet temperature of 250 F
and 300 F respectively.

Set up splitter specification so that 20% of the splitter feed exits as the purge gas.

For F-1 use an adiabatic flash (duty zero).
2
REACTION DATA

Vapor Phase.

The reactor is jacketed and controlled to 435 F.

95% conversion of benzene to cyclohexane
Use a conversion reactor. Enter the reaction data through “Flowsheet / Reaction Package”.
Part 2
Would Grayson-Streed. (GS) be better? If so, use and compare results.
Part 3
Change the split ratio of the splitter. Explain how does that affect the levels of CH4 and H2 in
the system. Keep in mind that you want to produce Cyclohexane at a minimum cost.
a) Do we want a large split ratio or a small one? Is there any trade-off?
b) If the feed of the reactor should have a relation of hydrogen to benzene of 15:1, how can you
achieve it?
3