Difference between revisions of "Process-Simulation-using-DWSIM/C2/Distillation-Column-for-Binary-Mixture/English"
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Revision as of 15:34, 10 February 2026
Title: Distillation Column for Binary Mixture
Author: Priyam Nayak
Keywords: DWSIM, Material stream, shortcut distillation, compounds, thermodynamic package, heavy key, light key, recovery, feed stage, reflux ratio, video tutorial.
| Visual Cue | Narration |
| Slide Number 1
Title Slide |
Welcome to this tutorial on simulating a Distillation Column for Binary Mixture in DWSIM. |
| Slide Number 2
Learning Objectives |
In this tutorial, we will learn to:
|
| 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. |
This tutorial is recorded using the following setup.
The process demonstrated in this tutorial is identical in other OS as well. |
| Slide Number 4
Pre-requisites
|
To practice this tutorial, you should know the following. |
| Slide Number 5
Problem Statement |
This problem was solved in the spoken tutorial on Shortcut Column for Binary Mixture.
We will simulate a Distillation Column using the results obtained during the Shortcut Column simulation. For this, we will use the DWSIM file saved during the Shortcut Column for Binary Mixture tutorial. |
| Slide Number 6
Code Files |
binary-shortcut file used in the tutorial is provided as a Code file on this tutorial page.
Download this file from Code Files link. |
| Switch to DWSIM. | I have already opened DWSIM on my machine. |
| Show DWSIM window
File >> Save As >> binary-distillation |
I have opened the file binary-shortcut.dwxmz.
Let me save it as binary-distillation. We can see that the file name has changed now to binary-distillation. |
| Slide Number 7
Solution Reflux Ratio = 2.5251 Actual number of stages = 20 Optimal feed location = 10 Bottoms product rate=1202.04 kmol/h |
This represents the solution to the given problem using the Shortcut Column.
We will be using these values shortly. |
| Switch to DWSIM | Let me switch back to DWSIM. |
| Point to Object Palette
Click on the Columns section. Click and drag Distillation Column to the flowsheet |
Now, let us add a Distillation Column.
Go to the Column section in the Object Palette. Drag and drop a Distillation Column to the flowsheet. Ensure to drop the Distillation Column a bit far away from the Shortcut Column |
| Point to DCOL-1 added to the flowsheet. | This is the Distillation Column.
It is similar to the shortcut column. It has 3 material streams and 2 energy streams auto-connected to its connection ports. |
| Point to material Stream 4. | Material Stream named 4 enters the Distillation Column as feed. |
| Point to Material Stream 5. | Material Stream named 5 leaves the Distillation Column as Distillate. |
| Point to Material Stream 6. | Material Stream named 6 leaves the Distillation Column as a Bottoms. |
| Point to Energy Stream E3. | Energy Stream E3 acts as Condenser Duty. |
| Point to Energy Stream E4. | Energy Stream E4 acts as Reboiler Duty. |
| Point to Distillation Column DCOL-1. | Now, let us rename all the objects. |
| Click 4
Type DC-Feed Press Enter. |
Click on the Material Stream named 4 and rename it as DC-Feed. |
| Click 5
Type DC-Distillate Press Enter. |
Next, click on the Material Stream named 5 and rename it as DC-Distillate. |
| Click 6
Type DC-Bottoms Press Enter. |
Next, click on the Material Stream named 6 and rename it as DC-Bottoms. |
| Click E3
Type DC-C-Duty. Press Enter. |
Next, click on the Energy Stream named E3 and rename it as DC-C-Duty. |
| Click E4
Type DC-R-Duty. Press Enter. |
Next, click on the Energy Stream named E4 and rename it as DC-R-Duty. |
| Click DCOL-1
Type DColumn. Press Enter. |
Click on the Distillation Column named DCOL-1 and rename it as DColumn. |
| Point to all the streams. | All our streams and the unit operation have been named. |
| Now we specify the feed stream connected to the distillation column.
Instead of entering the values manually, we will copy them from the SC-Feed. | |
| Click on DC-Feed
Highlight Temperature, Pressure, and Molar Flow Rate values. Right-click on DC-Feed. Copy from >> SC-Feed Highlight Temperature, Pressure, and Molar Flow Rate values |
For this, first click on DC-Feed.
Notice the existing values of temperature, pressure and molar flow rate. Now right-click the DC-Feed. Click on Copy from and then click on SC-Feed. Now look at the temperature, pressure, and molar flow rate values of DC-Feed. They are as per the problem statement. |
| Click on Distillation Column
Point to Property Editor Window. |
Next, click on the Distillation Column.
The property editor window opens. |
| Highlight the General tab | We land in 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. |
| Show Slide 7
Solution Highlight Actual Number of Stages >> 20 in the slide |
We got the Actual Number of Stages to be 20 from the shortcut method. |
| Number of Stages >> 20 | Enter the Number of Stages as 20 and press Enter. |
| Highlight Condenser/Top Pressure
Condenser/Top Pressure >> 1.2 |
Next is Condenser/Top Pressure.
Enter the pressure as 1.2 bar and press Enter. |
| Highlight Column Pressure Drop
Column Pressure Drop >> 0.3 |
Next is Column Pressure Drop.
This is calculated as the difference between the reboiler and condenser pressure. Reboiler pressure is 1.5 bar, and condenser pressure is 1.2 bar. So column pressure drop is 0.3 bar. Enter the column pressure drop as 0.3 bar and press Enter. |
| Highlight 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. |
| Highlight Specification tab
Click on Specifications tab |
Next is the Specifications tab.
Click on the Specifications tab. Through this, we will provide the top and bottom specifications. |
| Highlight the Condenser tab.
Select Condenser Type as Total |
We are on the Condenser tab.
Select Condenser Type as Total, if not already selected by default. |
| Condenser Pressure drop >> 0. | Select Condenser Pressure drop as zero.
We will leave the default selection 0 as it is. |
| Specification >> Reflux Ratio | Next select the Specification as Reflux Ratio.
By default, Reflux Ratio is already selected as Specification. |
| Reflux Ratio >> 2.5251 | Under Compound, we can see a field.
Here we will enter the value of Reflux Ratio as 2.5251 and Press Enter. |
| Click on Reboiler tab | Now, click on the Reboiler tab. |
| Specification >> Product Molar Flow
Change Units to kmol/h Molar flow rate >> 1202.04 Highlight 1202.04 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 1202.04. Press Enter. This is suggested by the shortcut solution. |
| Highlight Stages tab
Click on Stages tab Highlight the Efficiency column |
Next click on the Stages tab.
This is to specify the efficiency of the stages in the column. We will leave it with the default value. |
| Highlight Connections tab.
Click on Connections tab. |
Next click on the Connections tab. |
| Highlight Stream Connections | Under Connections, the first tab is Stream Connections.
This is to connect various material and energy streams to the column. For this problem, all material and energy streams are connected to the column. |
| Highlight Stream-Stage Associations
Click Stream-Stage Associations |
Under Connections, the next tab is Stream-Stage Associations.
Click Stream-Stage Associations. This is to specify the stage location of different streams connected to the column. |
| Show Slide 7
Solution Highlight Optimal Feed Stage >> 10 |
As per shortcut column results, the optimal feed stage is 10. |
| Click drop-down under Stage Location
Feed >> Stage location >> Stage9 |
Click on the drop-down under Stage Location against Feed Port Type.
Counting Condenser as first stage, Stage1 as second stage and so on. Keep counting from top to bottom and Stage9 becomes 10th Stage. So for Feed Port Type, select Stage location as Stage9. |
| Highlight Side Draw Specs
Click Side Draw Specs |
Under Connections, the next tab is Side Draw Specs.
Click Side Draw Specs. This is to specify the flow rate of side draw streams, if any. Since there are no side draw streams attached to the column, the tab is blank. |
| Highlight Estimates tab
Click Estimates tab |
After Connections, Next is Estimates tab
Click on Estimates tab This is to specify the initial value for some of the variables, like temperature, flow rate. This is generally done when the system is complex and difficult to converge. |
| Now we will run the simulation. | |
| Click on the Solve button | Click on the Solve button on the toolbar. |
| Click on the Results tab | When the calculations are completed, click on the Results tab |
| Highlight
Condenser Duty = 23576.1 kW Reboiler Duty = -30783.1 kW |
This shows all the required results like*Condenser Duty
|
| Highlight Column Temperature, Pressure and Composition 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
Highlight tabs*Temperature 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. |
| Slide Number 8
Summary |
This brings us to the end of this tutorial.
Let's summarize. |
| Slide Number 9
Assignment Solve the Distillation Column for the modified problem given in the assignment of the Shortcut Column for Binary Mixture. |
As an assignment, please do the following: |
| Slide Number 10
DWSIM Flowsheeting Project |
We invite you to participate in DWSIM Flowsheeting Project. |
| Slide Number 11
Lab Migration Project |
We invite you to migrate commercial simulator labs to DWSIM. |
| Slide Number 12
Acknowledgements |
The FOSSEE project is funded by NMEICT, Ministry of Education(MoE), Government of India. |
| Slide Number 13
Thanks |
We thank the DWSIM team for making it as an open source software.
|
