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Unit Operations Lecture 16_17

Unit Operations Lecture 16_17. 22 – 31 Oct 2012. Overview. Review rigorous methods / RADFRAC Multicomponent systems: Residue curves DSTWU / RADFRAC Rules of thumb Complex (Enhanced) distillation Column internals Batch distillation. Multicomponent Rigorous Methods.

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Unit Operations Lecture 16_17

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  1. Unit Operations Lecture 16_17 22 – 31 Oct 2012

  2. Overview • Review rigorous methods / RADFRAC • Multicomponent systems: • Residue curves • DSTWU / RADFRAC • Rules of thumb • Complex (Enhanced) distillation • Column internals • Batch distillation

  3. Multicomponent Rigorous Methods Rigorous Methods: solution of stage by stage material balances, energy balances, and thermodynamic equilibrium equations.

  4. AspenPlus: RADFRAC Rigorous two- or three-phase fractionation for single columns. Models absorbers, strippers, reactive distillation, and so forth. • RadFrac is a rigorous model for simulating all types of multistage vapor liquid fractionation operations. In addition to ordinary distillation, it can simulate: • absorption, reboiled absorption, stripping, reboiled stripping, extractive and azeotropic distillation

  5. Rigorous Model

  6. AspenPlus: RADFRAC Rigorous two- or three-phase fractionation for single columns. Models absorbers, strippers, reactive distillation, and so forth. • RadFrac is a rigorous model for simulating all types of multistage vapor liquid fractionation operations. In addition to ordinary distillation, it can simulate: • absorption, reboiled absorption, stripping, reboiled stripping, extractive and azeotropic distillation • RadFrac is suitable for: • three phase systems, narrow boiling and wide boiling systems, systems exhibiting strong liquid phase nonideality • RadFrac can detect and handle a free water phase or other secondliquidphase anywhere in the column. You can decant free water from the condenser. • RadFraccan handle solids on every stage. • RadFrac can model columns where chemical reactions are occurring. Reactions can have fixed conversions, or they can be: • equilibrium, rate controlled, electrolytic • RadFrac can model columns where two liquid phases exist and different chemical reactions occur in the two liquid phases. RadFrac can also model salt precipitation. • RadFrac can operate in rating mode or design mode. • With Aspen Rate-Based Distillation feature, RadFrac can perform rate-based distillation calculations (packed tower configurations).

  7. Rating Mode

  8. Design Mode

  9. Rigorous Model

  10. Multicomponent Methods AspenPlus (methanol, ethanol, 1-propanol): AspenPlusTxy

  11. “Residue” From Batch Distillation Seader & Henley (2006)

  12. Residue Curve Map

  13. Residue Curve Map

  14. Residue Curve Map

  15. DSTWU Zi= 1/3 MeOH recovery (dist.) = 99.9% EtOH recovery (dist.) = 0.1% R=1.2* Rmin

  16. RADFRAC Zi= 1/3 F= 100 kmol/h R=5.2 N=63 NF=31 D=33 kmol/h

  17. Residue Curve Map

  18. Plot Wizard

  19. NF = 21

  20. Set up Scheme 2 (1st column only) • Run DSTWU • Run RADFRAC • Check performance

  21. Questions?

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