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: Simulate a Rigorous Distillation column Specify column Pressure Profile Specify Tray Efficiencies Check desired product compositions and View the Column profiles
Slide Number 3 System Requirements	This tutorial is recorded using DWSIM 5. 8 (Classic UI) Update 3 and Windows 10 OS. 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- Add components to a flowsheet Select thermodynamic packages Add material and energy streams and specify their properties.
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 File >> Save As >> rigorous	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 Press Enter.	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	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 Condenser Duty Reboiler Duty and Column Profiles
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 - Temperature profiles Flows profiles Component flows and Component fractions 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: Simulate a Rigorous Distillation column Specify column Pressure Profile Specify Tray Efficiencies Check desired product compositions and View the Column profiles
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. Perform the simulation using Rigorous Distillation. Here is the assignment problem statement of the Shortcut Column.
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
	With this, we have come to the end of this tutorial.
Slide Number 13 About the Spoken Tutorial Project	Watch the video available at the following link. http://spoken-tutorial.org/ It summarizes the Spoken Tutorial project.
Slide Number 14 Spoken Tutorial Workshops	The Spoken Tutorial Project Team Conducts workshops and Gives certificates. For more details, please write to us.
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 Lab Migration Project	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 Acknowledgements	Spoken Tutorial and FOSSEE projects are funded by NMEICT, MHRD, Government of India.
Slide Number 19 Thanks	This tutorial was originally recorded by Prof Kannan Moudgalya in September 2015. This is Kaushik Datta from IIT Bombay. Thanks for joining.

Contributors and Content Editors

Kaushik Datta