DWSIM/C2/Shortcut-Distillation/English-timed
From Script | Spoken-Tutorial
| Time | Narration |
| 00:01 | Welcome to this tutorial on Simulating a Shortcut Distillation column in DWSIM. |
| 00:07 | In this tutorial, we will learn to: |
| 00:10 | Simulate a Shortcut distillation column |
| 00:13 | Calculate Minimum number of stages |
| 00:16 | Calculate Minimum reflux ratio |
| 00:19 | Calculate Optimal Feed stage location |
| 00:22 | Calculate Condenser and Reboiler duty |
| 00:26 | This tutorial is recorded using
DWSIM version 5. 8 (Classic UI) Update 3 and Windows 10 OS |
| 00:37 | But, this process is identical in Linux, Mac OS X or FOSSEE OS on ARM. |
| 00:43 | To practise this tutorial, you should know to- |
| 00:47 | Add components to a flowsheet |
| 00:50 | Select thermodynamic packages |
| 00:53 | Add material and energy streams and specify their properties. |
| 00:58 | The prerequisite DWSIM tutorials are available on this website. |
| 01:03 | You can access these tutorials and all the associated files from this site. |
| 01:09 | We will develop a flowsheet to determine Outlet stream properties after Shortcut Distillation. |
| 01:15 | Here we give Compounds, Thermodynamics and Inlet stream conditions. |
| 01:21 | Next, we give Shortcut Column Properties. |
| 01:25 | I have already opened DWSIM. |
| 01:28 | Go to File menu and select New Steady-state Simulation. |
| 01:33 | Simulation Configuration Wizard window opens. |
| 01:35 | Click on Next button at the bottom. |
| 01:40 | In the Compounds Search tab, type Benzene. |
| 01:45 | Select Benzene from ChemSep database. |
| 01:49 | Similarly, add Toluene. |
| 01:52 | Click the Next button at the bottom. |
| 01:56 | Now comes Property Packages. |
| 01:59 | From Available Property Packages list, double-click on Raoult’s Law. |
| 02:04 | At the bottom, click on the Next button. |
| 02:08 | Next option is System of Units. |
| 02:12 | Under System of Units, select C5. |
| 02:17 | Pressure menu appears at the top of this list. |
| 02:20 | Select atm for atmosphere and press Enter. |
| 02:25 | Lastly, at the bottom, click on the Finish button. |
| 02:30 | Now maximize the Simulation window. |
| 02:33 | Now let’s insert a feed stream that has to be distilled. |
| 02:38 | At the bottom of the main simulation window, go to Streams. |
| 02:43 | From the displayed list, drag and drop a Material Stream to the Flowsheet. |
| 02:48 | Click on the material stream named MSTR 000. |
| 02:53 | Let’s change the name of this stream to Feed.
Press Enter. |
| 02:59 | Now we will specify the Feed stream compositions. |
| 03:03 | For this under Input Data click on Compound Amounts tab. |
| 03:09 | Choose the Basis as Mole Fractions, if not already selected. |
| 03:14 | By default, Mole Fractions is already selected as Basis. |
| 03:19 | For Benzene enter 0.4 and press Enter. |
| 03:24 | For Toluene enter 0.6 and press Enter. |
| 03:30 | On the right, click on the Accept Changes button. |
| 03:34 | Now we will specify the Feed stream properties. |
| 03:38 | Go to Input Data. |
| 03:40 | Under Stream Conditions tab, select Flash Spec as Pressure and Vapor Fraction. (PVF) |
| 03:48 | Change Pressure to 1 atmosphere and press Enter. |
| 03:53 | Change Molar flow to 100 Kmol per hour and press Enter. |
| 03:59 | Now locate Vapor Phase Mole Fraction. |
| 04:03 | Here the default value is 0. |
| 04:05 | This indicates that the liquid is saturated.
Let us leave it as it is. |
| 04:10 | Now let us insert a Shortcut Column into the flowsheet. |
| 04:15 | At the bottom of the main simulation window, go to Columns tab. |
| 04:20 | The Shortcut Column is based on Fenske-Underwood-Gilliland method. |
| 04:25 | From the displayed list, drag and drop a Shortcut Column to the Flowsheet |
| 04:30 | Now let us insert two output streams. |
| 04:34 | To do that, let us drag one Material Stream. |
| 04:38 | Leave that stream as unspecified. |
| 04:42 | Then we will change the name of this stream to Distillate. |
| 04:47 | Next, we will insert another Material Stream. |
| 04:51 | Leave that stream as unspecified. |
| 04:54 | Let us change the name of this stream to Bottoms.
Press Enter. |
| 05:00 | Let us now insert two Energy streams for Condenser duty and Reboiler duty. |
| 05:06 | Go to Streams tab.
From the displayed list, drag and drop two Energy Streams to the Flowsheet. |
| 05:14 | Let us now arrange it as required. |
| 05:17 | Name these streams as C-Duty and R-Duty. |
| 05:23 | We are now ready to specify the Shortcut distillation column.
So let’s click on it. |
| 05:29 | On the left, we can see a tab displaying properties related to the Shortcut Column. |
| 05:35 | Under Connections, click on the drop-down against Feed Stream.
Select Feed. |
| 05:43 | Click on the drop-down against Distillate Stream and select Distillate. |
| 05:50 | Click on the drop-down against Bottoms Stream and select Bottoms. |
| 05:57 | Click on the drop-down against Condenser Duty and select C-Duty. |
| 06:04 | Click on the drop-down against Reboiler Duty and select R-Duty. |
| 06:10 | This completes the connectivity of the flowsheet. |
| 06:13 | Now, go to the Calculation Parameters. |
| 06:17 | This section is used to specify various attributes of a Shortcut Column. |
| 06:22 | Click on the drop-down against Light Key Compound (LK) and select Benzene. |
| 06:31 | Click on the drop-down against Heavy Key Compound (HK) and select Toluene. |
| 06:39 | Now go to Condenser Type.
By default, it is Total Condenser. |
| 06:45 | If a partial condenser is required, we can change it here. |
| 06:49 | Click on the field against LK Mole Fraction in Bottoms and enter it as 0.01 and press Enter. |
| 06:58 | Click on the field against HK Mole Fraction in Distillate and enter it as 0.01
Then press Enter. |
| 07:08 | Let us go back to the slides. |
| 07:11 | Recall that we want our reflux ratio to be 1.4 times the minimum reflux ratio. |
| 07:18 | So let us check the minimum reflux ratio. |
| 07:22 | For this, let us run simulation once. |
| 07:26 | To do this, click on Solve Flowsheet button. |
| 07:30 | Click on the Distillation Column. |
| 07:33 | From the Property Editor Window, locate Results section. |
| 07:38 | Now we can see that Minimum Reflux Ratio is 1.655.
So the actual Reflux Ratio will become 2.317. |
| 07:49 | Next let us enter the reflux ratio. |
| 07:53 | Look at the Shortcut Column results. |
| 07:56 | Here note the Actual Number of Stages and Optimal Feed Stage.
We can see that these values are NaN. |
| 08:05 | This is because the default value of reflux ratio is 1.5.
It is less than minimum reflux ratio. |
| 08:14 | Now let us enter the Reflux Ratio. |
| 08:18 | Enter the value as 1.655 into 1.4 and press Enter. |
| 08:26 | Now the Reflux Ratio is 2.317. |
| 08:31 | Click on the field against Condenser Pressure and enter it as 1 atmosphere
and press Enter. |
| 08:40 | Click on the field against Reboiler Pressure and enter it as 1 atmosphere .
Then press Enter. |
| 08:48 | Now we will run the simulation. |
| 08:51 | To do this, click on the Solve Flowsheet button on the toolbar. |
| 08:56 | When calculations are completed, click on the Shortcut column. |
| 09:01 | From the Property Editor Window, locate Results section. |
| 09:06 | This shows all the required results like: |
| 09:09 | Minimum Reflux Ratio |
| 09:11 | Minimum Number of Stages |
| 09:14 | Actual Number of Stages |
| 09:17 | Optimal Feed Stage |
| 09:19 | Condenser Duty, Reboiler Duty, etc |
| 09:24 | I have tabulated these results in a slide. |
| 09:28 | Let us go back to the simulation. |
| 09:31 | Let me save this.
I will save it as shortcut-end. |
| 09:38 | Let's summarize. |
| 09:40 | In this tutorial, we have learnt to: |
| 09:42 | Simulate a Shortcut distillation column, Calculate Minimum number of stages, Calculate Minimum reflux ratio, Calculate Optimal Feed stage location , Calculate Condenser and Reboiler duty |
| 09:58 | As an assignment,
Repeat this simulation with different compounds., Different feed conditions. |
| 10:06 | Different Column Properties. |
| 10:08 | This brings us to the end of this tutorial. |
| 10:11 | Watch the video available at the following link.
It summarizes the Spoken Tutorial project. |
| 10:17 | The Spoken Tutorial Project Team
Conducts workshops and Gives certificates. |
| 10:22 | For more details, please write to us. |
| 10:25 | Please post your time queries in this forum. |
| 10:29 | The FOSSEE team coordinates conversion of existing flowsheets into DWSIM. |
| 10:35 | We give honorarium and certificates for those who do this.
For more details, please visit this site. |
| 10:44 | 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 |
| 10:58 | Spoken Tutorial and FOSSEE projects are funded by NMEICT, MHRD, Government of India. |
| 11:07 | We thank the DWSIM team for making it as an open source software.
This tutorial was originally recorded by Prof Kannan Moudgalya in May 2015. |
| 11:19 | This is Kaushik Datta from IIT Bombay. Thanks for joining. |
