Transcript Distillation ChemCAD

Distillation ChemCAD
CHBE 446
February 13, 2015
Group: 8
Cesar Castro
Jacky Tsai
Dung Phan
Vivi He
Outline/Agenda
• Types of Distillation Columns in ChemCAD
• Steps for doing distillation in ChemCAD
– 1 set up workspace
– 2 choose component
– 3 thermodynamic setting
– 4 feed stream data
– 5 distillation column data
– 6 RUN and report streams
• Plots
Types of Distillation Column in
ChemCAD
• There are three rigorous steady state distillation models in
CHEMCAD:
– scds (simultaneous correction distillation)
– tower (Inside-out method)
– tower+ (tower unit with additional in/out connections).
• The shor column is not a rigorous column. The shor column
uses the Fenske-Underwood-Giliand model to calculate
separations.
• There is also one Batch column 
Which to choose?
•
•
•
•
scds column: activity coefficient K values
tower column: equations of state.
tower+ column: petroleum models.
shor column: generally used only in education,
and should not be used to model an actual
column.
Recommendations
Step one: set up in Workspace
This area is your Workspace 
Step two: choose components
1
3
2
Step two cont.
Step two cont.
Step three: Thermodynamic setting
http://www.chemstations.com/conte
nt/documents/Technical_Articles/ther
mo.pdf
This website (also listed in Design
course webpage) explains
thermodynamic models in detail
Thermodynamic Model
Step four: feed stream data
3
2 Choose two to enter
Data shown
after Flash
1
Step five: distillation column data
Step five cont.
Step six: RUN and report
• You can get your stream
composition and properties
reports afterwards
Example: stream composition report
Plots
Example: Txy-plot
Example: xy-plot
Reference
• http://home.anadolu.edu.tr/~skaytako/web_
malzemeleri/DISTILLATION%20CONVERGENCE
.pdf