distillation chemcad group: 8 cesar castro jacky tsai dung phan vivi he chbe 446 february 13, 2015
TRANSCRIPT
Distillation ChemCAD
Group: 8Cesar CastroJacky TsaiDung Phan
Vivi He
CHBE 446February 13, 2015
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
2
3
Step two cont.
Step two cont.
Step three: Thermodynamic setting
http://www.chemstations.com/content/documents/Technical_Articles/thermo.pdf
This website (also listed in Design course webpage) explainsthermodynamic models in detail
Thermodynamic Model
Step four: feed stream data
1
3
2 Choose two to enter
Data shown after Flash
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