DWSIM/C2/Rigorous-Distillation/English
Visual Cue | Narration |
Slide Number 1
Title Slide |
Welcome to this tutorial on Simulating a Rigorous Distillation column in DWSIM. |
Slide Number 2
Learning Objectives |
In this tutorial, we will learn to:
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Slide Number 3
System Requirements |
This tutorial is recorded using
But, this process is identical in Linux, Mac OS X or FOSSEE OS on ARM. |
Slide Number 4
Prerequisites |
To practise this tutorial, you should know to-
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Slide Number 5
Prerequisite Tutorials and Files https:\\spoken-tutorial.org |
The prerequisite tutorials are available on this website.
You can access these tutorials and all the associated files from this site. |
Slide Number 6
Code Files |
shortcut-end file used in the tutorial is provided as a Code file on this tutorial page.
Download the files from Code Files link. |
Switch to DWSIM. | I have already opened DWSIM on my machine. |
Show DWSIM window
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I have opened the file shortcut-end.dwxmz.
Let me save this as rigorous. We can see that the file name has changed now to rigorous. |
Click on the Settings button | Click on the Settings button on the toolbar. |
Click on Systems of Units tab. | Click on Systems of Units tab. |
Pressure → atm
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Locate Pressure menu on the right hand column.
Click and choose atm for atmosphere. Press Enter. |
Delta_P → atm
Press Enter. |
Similarly, change the units of Delta_P to atm.
Press Enter. |
Close the Settings window. | Close the Settings window. |
Let me switch to the slides. | |
Slide Number 7
Compounds: Benzene & Toluene Thermodynamics: Raoult’s Law Inlet Stream: Flow Rate: 100 Kmol/h Pressure: 1 atm Mole Fractions: Benzene = 0.4, Toluene = 0.6 Method: Fenske-Underwood-Gilliland |
This problem was solved in the spoken tutorial on Shortcut Distillation. |
Slide Number 8
Column Properties Reflux Ratio: 1.4 times minimum reflux ratio. Product: Light: Benzene, Heavy: Toluene Distillate: XD = 0.99 Bottoms: XB = 0.01 |
These values form the basis for the rigorous distillation column problem. |
Slide Number 9
Solution Minimum reflux ratio = 1.655 Minimum number of stages = 11 Actual number of stages = 20 Optimal feed location = 9 Bottoms product rate=60.204 kmol/h |
This represents the solution of the given problem using Shortcut Distillation.
We will be using these values shortly. |
Let us begin by replacing the Shortcut column with a Rigorous column. | |
Let me go back to the simulation. | |
Shortcut column → Delete | Right-click on the Shortcut column, and select delete.
Click Yes in the prompt box. |
Click on Columns tab | At the bottom of the main simulation window, go to Columns tab. |
Click and drag Distillation Column to the flowsheet | From the displayed list, drag and drop a Distillation Column to the Flowsheet. |
Let’s us now arrange it as required. | |
Click on the Distillation Column. | Click on the Distillation Column. |
Cursor to the Property Editor Window | On the left, go to the Property Editor Window of the Distillation Column. |
Column Specs >> General | Now under Column Specs, click on the General tab. |
Cursor to Number of Stages option | Locate the Number of Stages option.
We have to enter the total number of trays here. |
We got the equilibrium stages to be 20 from the shortcut method. | |
Show slide.
Highlight 20 |
We can see it in the slide.
Let us go back to DWSIM. |
Number of Stages >> 21 | This number should be one more than the equilibrium stages given by shortcut method.
So, change the Number of Stages to 21 and press Enter. |
Click the Condenser tab to show total condenser. | This number includes the condenser also in DWSIM.
So here we will use a total condenser. |
Cursor to Solver option | Now we will select the solution method. |
Solver >> Wang-Henke (Bubble Point) | Click on the drop-down against Solver.
Choose the Solver as Wang-Henke (Bubble Point), if not already selected. By default, Wang-Henke (Bubble Point) is already selected as Solver. |
Now we will connect the streams to the Distillation column. | |
Point to Column Configuration | Go to Column Configuration section. |
Connections >> Streams Connections >> Feeds | Navigate to Connections >> Streams Connections >> Feeds |
Point to the Feed Ports
Select Column Feed Port #5 |
Here we have to specify the stream which is entered as a feed to the column.
Here, we can see the list of Feed Ports. Select any port where we want the feed to enter the Distillation column. For a better look, we select Column Feed Port #5. |
Click on the down-down against Column Feed Port #5. | Click on the down-down against Column Feed Port #5.
Select Feed and press Enter. |
In a similar way, we will connect the product streams. | |
Click on the Products tab. | Now, click on the Products tab. |
Distillate >> Distillate | Select Distillate as Distillate and press Enter. |
Bottoms >> Bottoms. | Select Bottoms as Bottoms and press Enter. |
Now we will connect heat duties to reboiler and condenser. | |
Click on the Duties tab. | Click on the Duties tab. |
Select Reboiler Duty as R-Duty. | Select Reboiler Duty as R-Duty and press Enter. |
Select Condenser Duty as C-Duty. | Select Condenser Duty as C-Duty and press Enter. |
Connections >> Stream-Stage Associations | Now under Connections, click on Stream-Stage Associations tab. |
Feed >> Stage location >> Stage6.
Press Enter. |
For Feed Port type, select Stage location as Stage9.
Press Enter. |
This is as per the solution we got in the Shortcut Distillation column.
We got the Optimal Feed Location to be 9 from the Shortcut method. | |
Show slide.
Highlight:Optimal feed location = 9 |
We can see it in the slide.
Let us go back to DWSIM. |
This completes the connections. | |
Now we have to provide the top and bottom specifications. | |
Cursor to Column Specs | Under Properties tab, locate the section Column Specs. |
Click on the Condenser tab.
Select Condenser Type as Total
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Click on the Condenser tab.
Select Condenser Type as Total, if not already selected. By default, it is total condenser. We will leave it as it is. |
Condenser Pressure >> 1 atm | Change Condenser Pressure to 1 atm and press Enter. |
Condenser Pressure drop >> 0. | Select Condenser Pressure drop as 0.
By default, it is 0. We will leave it as it is. |
Specification >> Reflux Ratio | Next select the Specification as Reflux Ratio, if not already selected.
By default, Reflux Ratio is already selected as Specification. |
Reflux Ratio >> 2.317 | Under Compound, we can see a field.
Here we can enter the value of reflux ratio. We will enter the Reflux Ratio as 2.317. Press Enter. |
Click on Reboiler tab
Reboiler Pressure >> 1.1 atm |
Now click on Reboiler tab.
Change Reboiler Pressure to 1.1 atm and press Enter. |
Specification >> Product Molar Flow
Molar flow rate >> 60.204 Highlight 60.204 in the slide |
Select Specification as Product Molar Flow, if not already selected.
Under Compound, change the units to kmol/h and press Enter. Now enter the Molar flow rate as 60.204. Press Enter. This is suggested by the shortcut solution. We can see it in the slide. |
Let us go back to DWSIM. | |
Now we will also see how to specify the pressure for the intermediate stages. | |
Point to Column Configuration section | Now go to Column Configuration section. |
Click on Stages tab. | Click on Stages tab. |
Cursor to the Condenser and Reboiler value(drag to see Reboiler)
Point to the zero assigned Pressure |
It shows the condenser and reboiler pressures as 1 and 1.1 atmosphere.
New stages that have been added, are assigned zero pressure, which is incorrect. We would like the intermediate stage pressures to take the interpolated values. |
Click on the Estimate Stage Pressures by Interpolation
Point to the Pressure values Cursor to the Efficiency column |
Under Column Configuration section, go to the extreme left.
Here we can see 5 different icons. Hover the mouse to the last icon. A popup is displayed as Estimate Stage Pressures by Interpolation. Click on the icon. Immediately, linearly interpolated values are assigned to every stage. We can also edit the pressure of the individual stages, if they are known. We may also change the efficiency in one or more stages. |
Now we will run the simulation. | |
Click on Solve Flowsheet button | Click on Solve Flowsheet button on the toolbar. |
When the calculations are completed, click on the Distillation column. | |
Cursor to the Distillation column
Cursor to the Results Condenser Duty = 1130.51 kW Reboiler Duty = -1161.91 kW |
Go to the Property Editor Window of the Distillation Column.
Locate the Results section. This shows all the required results like
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Cursor to Column profiles | Now let us look at the Column profiles. |
Click on View Temperature, Pressure and Composition Profiles button. | Click on View Temperature, Pressure and Composition Profiles button. |
Point to the Column profiles
Click on the Table tab |
Now we can see a pop-up window.
Here, we can see the -
For the exact numbers, click on the Table tab to the right of the Graph tab. |
Press CTRL+S | Now save this file. |
Slides | Let us summarize |
Slide Number 10
Summary |
In this tutorial, we have learnt to:
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Slide Number 11
Compounds: Ethanol & Water Thermodynamics: Raoult’s Law Inlet Stream: Flow Rate: 100 kmol/h Pressure: 1 atm Mole Fractions: Ethanol = 0.5, Water = 0.5 |
Take the Assignment from the Shortcut Distillation column.
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Slide Number 12
Column Properties Reflux Ratio: 1.5 times the minimum reflux ratio. Product: Light: Ethanol, Heavy: Water Distillate: XD = 0.99 Bottoms: XB = 0.01 |
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With this, we have come to the end of this tutorial. | |
Slide Number 13
About the Spoken Tutorial Project
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Watch the video available at the following link.
It summarizes the Spoken Tutorial project. |
Slide Number 14
Spoken Tutorial Workshops |
The Spoken Tutorial Project Team
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Slide Number 15
Forum Slide Do you have questions in this Spoken Tutorial? Please visit this site Choose the minute and second where you have the question. Explain your question briefly. Someone from the FOSSEE team will answer them. |
Please post your time queries in this forum. |
Slide Number 16
DWSIM Flowsheeting Project |
The FOSSEE team coordinates conversion of existing flowsheets into DWSIM.
We give honorarium and certificates for those who do this. For more details, please visit this site. |
Slide Number 17
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The FOSSEE team helps migrate commercial simulator labs to DWSIM.
We give honorarium and certificates for those who do this. For more details, please visit this site |
Slide Number 18
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Spoken Tutorial and FOSSEE projects are funded by NMEICT, MHRD, Government of India. |
Slide Number 19
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This tutorial was originally recorded by Prof Kannan Moudgalya in September 2015.
This is Kaushik Datta from IIT Bombay. Thanks for joining. |