GE 115, Section 11

GE 115, Section 11

Chemical Engineering Equilibrium Separations Lectures 15 22-31 Oct 2012 1 In-Class Problem

benzene (17 mol%) toluene (66 mol%) m-xylene (17 mol%) D S HO RT Y DSTWU FEE D

F = 100 kmol/s satd liquid 1 atm B 1.0135 bar Pi star [bar] Compone

nt Benzene Toluene m-Xylene Tbp oC 80.1 110.7 139.1

80.1 oC 123 oC 1.0135 3.217 0.387 1.42 0.151 0.645 2

In-Class Problem 3 In-Class Problem 4 In-Class Problem

5 In-Class Problem 6 In-Class Problem

7 In-Class Problem 8 Overview AspenPlus: o Shortcut methods: DSTWU

o Rigorous method: RADFRAC Efficiencies Introduction to multicomponent distillation (Chapter 9) 9 Homework Problem benzene (17 mol%) toluene (66 mol%)

m-xylene (17 mol%) Xbz = 99 mol% D S HO RT Y DSTWU FEE D

F = 100 kmol/s satd liquid 1 atm B Xbz = 0.1 mol% 1.0135 bar Pi star [bar]

Compone nt Benzene Toluene m-Xylene Tbp oC 80.1 110.7

139.1 80.1 oC 123 oC 1.0135 3.217 0.387 1.42 0.151 0.645 10

HWK Problem-molefrac specified 11 HWK Problem-molefrac specified 12

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

13 Multicomponent Rigorous Methods Rigorous Methods: solution of stage by stage material balances, energy balances, and

thermodynamic equilibrium equations. 14 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: o absorption, reboiled absorption, stripping, reboiled stripping, extractive and azeotropic distillation 15 Rigorous Model

16 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: o absorption, reboiled absorption, stripping, reboiled stripping, extractive and

azeotropic distillation RadFrac is suitable for: o 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 second liquid phase anywhere in the column. You can decant free water from the condenser. RadFrac can handle solids on every stage. RadFrac can model columns where chemical reactions are occurring. Reactions can have fixed conversions, or they can be:

o 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). 17 Rating Mode

18 19 20 Design Mode

21 Rigorous Model 22 Multicomponent Methods AspenPlus (methanol, ethanol, 1-propanol): P*i

Component (64.5 oC) MeOH 1.013 bar EtOH 0.5709 1-Propanol 0.2534 Keys

AspenPlus Txy 23 Residue From Batch Distillation Seader & Henley (2006)

24 Residue Curve Map 25 Residue Curve Map 26

Residue Curve Map 27 DSTWU Zi = 1/3 MeOH recovery (dist.) = 99.9%

R = 1.2 * Rmin EtOH recovery (dist.) = 0.1% 28 RADFRAC Zi = 1/3

F = 100 kmol/h R = 5.2 N = 63 NF = 31 D = 33 kmol/h 29

Residue Curve Map 30 Plot Wizard 31

NF = 21 32 Set up Scheme 2 (1st column only) Run DSTWU Run RADFRAC Check performance

33 Questions? 34

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