1. Distillation ChemCAD Group: 8 Cesar Castro Jacky Tsai Dung Phan Vivi He CHBE 446 February 13, 2015

2. 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

3. 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

4. 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.

5. Recommendations

6. Step one: set up in Workspace This area is your Workspace

7. Step two: choose components 1 2 3

8. Step two cont.

10. 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

11. Thermodynamic Model

12. Step four: feed stream data 1 3 2 Choose two to enter Data shown after Flash

13. Step five: distillation column data

14. Step five cont.

15. Step six: RUN and report You can get your stream composition and properties reports afterwards

16. Example: stream composition report

17. Plots

18. Example: Txy-plot

19. Example: xy-plot

20. Reference http://home.anadolu.edu.tr/~skaytako/web_ malzemeleri/DISTILLATION%20CONVERGENCE.pdf