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SAJJAD KHUDHUR ABBAS
Ceo , Founder & Head of SHacademy
Chemical Engineering , Al-Muthanna University, Iraq
Oil & Gas Safet...
Simulation for design and analysis (I)
Separation of an azeotropic mixture
• Mixture analysis
Identification of an azeotro...
Mixture analysis
Whenever you have the problem of separating a mixture, a good starting
point is always to do a mixture an...
Identification of an azeotrope
Azeotropes is found by VLE (Vapor-Liquid Equilibria) mixture analysis.
This can be either d...
Acetone - chloroform
0
10
30
54
20
40
50
0
CHCl3
20 40 60
mole %
80 100
ACETONECHCl3
CHCl3mole%ACETONE
70
60
60
80
90
100
...
Possible separation techniques
Conventional distillation not possible, if 2 pure products are desired.
Possible solutions ...
Pressure swing
Pressure swing distillation is exploiting the fact that for
some azeotropes the composition changes with pr...
Extractive distillation
70
60
50
40
30
20
10
0
90
100
The addition of a third component (solvent/entrainer) to the
binary ...
Solvent identification (I)
The solvent can be found in a solvent database or by the use
of a computer tool.
The computer t...
Solvent identification (II)
Desired properties for the entrainer:
1.If it is a minimum boiling azeotrope the boiling point...
Solvent validation (I)
( 331.0 K) 0.0 0.1 0.2 0.3 0.4
328.1 K
0.5 0.6 0.7 0.8 0.9 1.0( 338.0 K)
METHYL-ACETATE METHANOL
1-...
Solvent validation (II)
0.0
( 331.0 K) 0.0
0.3
0.2
0.1
0.1 0.2 0.3 0.4
328.1 K
0.4
0.5
0.5 0.6 0.7 0.8 0.9
0.9
Azeotrope
0...
Flowsheet configuration
B
A, B, Solvent
A
Solvent
A, Solvent
The flowsheet is fixed, and consists of to columns to
allow s...
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Episode 56 : Simulation for design and analysis

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Episode 56 : Simulation for design and analysis
Separation of an azeotropic mixture
Mixture analysis
Identification of an azeotrope.
Possible separation techniques Pressure swing. Extractive/azeotropic distillation.
Solvent identification and validation
Flowsheet configuration
SAJJAD KHUDHUR ABBAS
Ceo , Founder & Head of SHacademy
Chemical Engineering , Al-Muthanna University, Iraq
Oil & Gas Safety and Health Professional – OSHACADEMY
Trainer of Trainers (TOT) - Canadian Center of Human
Development

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Episode 56 : Simulation for design and analysis

  1. 1. SAJJAD KHUDHUR ABBAS Ceo , Founder & Head of SHacademy Chemical Engineering , Al-Muthanna University, Iraq Oil & Gas Safety and Health Professional – OSHACADEMY Trainer of Trainers (TOT) - Canadian Center of Human Development Episode 56 : Simulation for design and analysis
  2. 2. Simulation for design and analysis (I) Separation of an azeotropic mixture • Mixture analysis Identification of an azeotrope. • Possible separation techniques Pressure swing. Extractive/azeotropic distillation. • Solvent identification and validation • Flowsheet configuration
  3. 3. Mixture analysis Whenever you have the problem of separating a mixture, a good starting point is always to do a mixture anaysis. This can include both pure component and mixture properties. The mixture analysis will imediately give information both intuitively and to a computer aided system on what kind of separation is possible. Binary Azeotrope: A binary azeotrope is when a 2 component, 2 phase system of gas and liquid in chemical equilibrium has the same composition in both phases. Gas phase, composition: ya, yb Liquid phase, composition: xa, xb Azeotropic condition: xa = ya, xb = yb
  4. 4. Identification of an azeotrope Azeotropes is found by VLE (Vapor-Liquid Equilibria) mixture analysis. This can be either database lookup for VLE datapoints or the datapoints can be calculated with a thermodynamic model. 0 1 0 Comp A 1 x y Comp A By the definition of an azeo- trope, in a x-y plot the curve crosses the diagonal, at the azeotrope composition.
  5. 5. Acetone - chloroform 0 10 30 54 20 40 50 0 CHCl3 20 40 60 mole % 80 100 ACETONECHCl3 CHCl3mole%ACETONE 70 60 60 80 90 100 VLE-PhaseDiagram: Pres.= 1.00 atm ACETONE 50 52 56 58 62 64 0 CHCl3 20 40 60 ACETONE 80 100 VLE-PhaseDiagram: Pres.= 1.00 atm Temperature(°C) Azeotrope ~ 38 mole% acetone, 64.5 °C, maximum boiling
  6. 6. Possible separation techniques Conventional distillation not possible, if 2 pure products are desired. Possible solutions to this problem: •Use separation techniques which are not exploiting differences in vapor vs. liquid phases, i.e. membranes or liquid- liquid extraction. • Pressure swing. • Extractive / azeotropic distillation.
  7. 7. Pressure swing Pressure swing distillation is exploiting the fact that for some azeotropes the composition changes with pressure 0 20 40 60 80 100 0 METHANOL 20 METHANOL 40 60 80 CH3-ACETATE 100 VLE-PhaseDiagram: Pres.= 1.00 atm mole % METHANOLmole%CH3-ACETA CH3-ACETATE 0 20 40 60 80 100 0 METHANOL 20 METHANOL 40 60 mole % 80 100 CH3-ACETATE VLE-PhaseDiagram: Pres.= 6.00 atm METHANOLmole%CH3-ACETA CH3-ACETATE
  8. 8. Extractive distillation 70 60 50 40 30 20 10 0 90 100 The addition of a third component (solvent/entrainer) to the binary system in order to facilitate the separation by distillation. VLE-PhaseDiagram: Pres.= 1.00 atm solvent mole % 0 CHCl3 20 40 60 80 100 Vapour Diagonal Vapour 60.0 CHCl3 mole % ACETONE CHCl3mole%ACETONE ACETONE
  9. 9. Solvent identification (I) The solvent can be found in a solvent database or by the use of a computer tool. The computer tool must be able to solve the following problem: Given: Needed: A set of desired properties (pure and mixture) Description of compounds with these properties Computer Aided Molecular Design (CAMD) programs can solve this. General functionality: 1. Combine molecular fragments to describe complete molecules 2. Predict the properties of the molecular descriptions 3. Reject descriptions with undesired properties
  10. 10. Solvent identification (II) Desired properties for the entrainer: 1.If it is a minimum boiling azeotrope the boiling point of the entrainer should be lower than the azeotropic temperature and vice versa. 2.The boiling point should not be to high in order to have small energy consumption. 3. Should not be harmful to the environment. 4.Should not form azeotropes with any of the two compounds. 5. High selectivety: S  6. Low solvent loss: S  7. ... iS jS s      sJ sv.L 1
  11. 11. Solvent validation (I) ( 331.0 K) 0.0 0.1 0.2 0.3 0.4 328.1 K 0.5 0.6 0.7 0.8 0.9 1.0( 338.0 K) METHYL-ACETATE METHANOL 1-PROPANAL ( 321.5 K) 1.0 0.9 Azeotrope 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0
  12. 12. Solvent validation (II) 0.0 ( 331.0 K) 0.0 0.3 0.2 0.1 0.1 0.2 0.3 0.4 328.1 K 0.4 0.5 0.5 0.6 0.7 0.8 0.9 0.9 Azeotrope 0.8 0.7 0.6 1.0 1.0( 338.0 K) 1-PROPANAL ( 321.5 K) METHYL-ACETATE METHANOL Feed 1 D1, Feed 2 B1 D2 B2
  13. 13. Flowsheet configuration B A, B, Solvent A Solvent A, Solvent The flowsheet is fixed, and consists of to columns to allow solvent recycle.
  14. 14. Thanks for Watching Please follow me / SAJJAD KHUDHUR ABBAS
  • FernSasina

    Apr. 18, 2021
  • DeependraKumarYadav3

    Mar. 26, 2019

Episode 56 : Simulation for design and analysis Separation of an azeotropic mixture Mixture analysis Identification of an azeotrope. Possible separation techniques Pressure swing. Extractive/azeotropic distillation. Solvent identification and validation Flowsheet configuration SAJJAD KHUDHUR ABBAS Ceo , Founder & Head of SHacademy Chemical Engineering , Al-Muthanna University, Iraq Oil & Gas Safety and Health Professional – OSHACADEMY Trainer of Trainers (TOT) - Canadian Center of Human Development

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