SIMPLE COLUMN WITH COMPOSITION SPECIFICATIONS
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View: Simulation Results
This example shows the calculation of a simple column which performs the separation of hexane and heavier components from pentanes and lighter components.
The feed stream is named F100, its temperature is 163°F and the pressure is 37 psia.
The
feed composition is as follows :
|
No |
Components |
Molar flow rate, lbm/h |
|
1 |
IBUTANE |
0.004 |
|
2 |
BUTANE |
1.296 |
|
3 |
IPENTANE |
51.454 |
|
4 |
PENTANE |
65.364 |
|
5 |
HEXANE |
10.621 |
|
6 |
HEPTANE |
1.302 |
|
7 |
OCTANE |
0.112 |
|
8 |
NONANE |
0.003 |
The column is specified with 8 trays a condenser and a reboiler, so the total number of theoretical trays is 10.
Top and bottom products are specified in terms of the hexane composition:
|
Top product |
E110 |
Hexane composition: 0.005 molar. |
|
Bottom product |
E120 |
Hexane composition: 0.657 molar. |
The column is operated with condenser pressure set at 30.5 psia, pressure drop at condenser (tray 0) is set at 5 psia and pressure drop per tray is set at 0.1 psia.
Bottom product flowrate is estimated at 15 lbm/h.
Top column temperature is estimated at 130°F whereas the bottom temperature is set at 200°F.
The key-word input generated by the windows interface is presented in the output document.
The Soave-Redlich-Kwong (SRK) is used for vapor-liquid equilibrium and the Lee-Kesler (LK) for enthalpy, entropy and density calculations.
RUN ID=COLUMN01 CUSTOMER=STAFF PROJECT='COLUMN SAMPLE 01'
DESC CALCULATION TEST
DIMENSION INPUT ENG
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System Data
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CHEMCOMP IBUTANE / BUTANE / IPENTANE / PENTANE / HEXANE / HEPTANE / +
OCTANE / NONANE
THERMSET UID=M1
METHODS K=SRK HV=LK HL=LK DV=LK DL=LK
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Flowsheet Data
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STREAM=F100 TEMP=163 PRES=37.
COMP .004 / 1.296 / 51.454 / 65.364 / 10.621 / 1.302 / .112 / .003
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COLUMN IN F100 OUT E110 E120 UID=C01
PARA TRAY=8 CON REB NITER=10
FEED STR=F100 TRAY=5
DRAWOFF STR=E110 TRAY=0 PHASE=LIQ
DRAWOFF STR=E120 TRAY=9 PHASE=LIQ RATE(VAR)=15.
HEAT TRAY=0 VAR
HEAT TRAY=9 VAR
PSPEC PTOP=30.5 TRAY=0 DP=5. / TRAY=1 DP=.1
PROFILE TRAY=0 LIQ=350. TEMP=130. / TRAY=8 LIQ=200. / TRAY=9 LIQ=15. +
TEMP=200.
PRINT TRACE=PART LKEY=IPENTANE,PENTANE HKEY=HEXANE FORMAT=2 TRAY=2 +
PROP=2 MFRAC WFRAC WRATE
PLOT PROFILE
SPEC FRAC(M)=.005 STR=E110 COMP=HEXANE
SPEC FRAC(M)=.657 STR=E120 COMP=HEXANE
TSIZE VALVE RATE
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END