DWSIM-3.4/C2/Shortcut-Distillation/English-timed

Time	Narration
00:01	Welcome to the spoken tutorial on simulating a Shortcut distillation column in DWSIM.
00:06	I am Kannan Moudgalya.
00:08	In this tutorial, we will simulate a Shortcut distillation column.
00:13	We will learn: to calculate: Minimum number of stages Minimum reflux ratio Optimal Feed stage location Condenser and reboiler heat duty
00:23	to achieve a particular product specification.
00:26	To record this tutorial, I am using DWSIM 3.4.
00:30	To practice this tutorial, you should know:
00:32	* How to add components to a flowsheet
00:35	* How to select thermodynamic packages
00:37	* How to add material streams and specify their properties.
00:41	The prerequisite tutorials are mentioned on our website: spoken-tutorial.org.
00:47	In the next two slides, we give specifications for the distillation problem.
00:55	This problem statement is given by Prof. Bill Luyben of Lehigh University.
01:00	I have already opened DWSIM.
01:03	Click on System of Units menu.
01:07	Select Custom 1.
01:10	This allows us to customize units which we will do next.
01:14	Let us click on Configure Simulation button.
01:18	Add Benzene from the ChemSep Database.
01:27	Next Toluene.
01:33	We will next click Thermodynamics and then Property Packages.
01:40	Scroll down and select Raoult’s Law.
01:44	Below the Thermodynamics option, you see Options menu. Click this.
01:49	Click Units System.
01:53	Let me bring this inside.
01:56	Pressure menu appears at the top of this list.
01:58	Click and choose atm for atmosphere.
02:04	Below the Pressure menu is the Molar flow rate menu.
02:08	Click it and select kmol/per hour.
02:13	Click on Back to simulation.
02:15	Let us insert a feed stream that has to be distilled.
02:21	Enter 0.4 for benzene and 0.6 for toluene.
02:29	Apply and Close.
02:32	We will change the name of this stream to Feed.
02:39	Click on Properties. Scroll to the top.
02:43	Click on Specification.
02:46	Choose Pressure and Vapor Fraction.
02:50	Locate the Molar flow rate option.
02:53	It has the units of kmol/per hour.
02:57	Click on this field. Enter 100.
03:02	Locate Molar Fraction (Vapor Phase).
03:08	The default value is 0.
03:10	This indicates saturated liquid.
03:13	Let us leave it as it is.
03:16	Let us insert a Shortcut column to the flowsheet.
03:20	Locate it from the Object palette.
03:23	The Shortcut Column is based on Fenske-Underwood-Gilliland method.
03:27	Click on it and drag it to the flowsheet.
03:32	Let us arrange it.
03:34	Now, let us insert two output streams.
03:37	One will be distillate, the other is Bottoms.
03:41	To do that, let us drag two material streams.
03:46	As they are output streams, we will leave them unspecified.
03:56	We will change the name of these streams to Distillate and Bottoms.
04:05	Let us now insert two Energy streams for Condenser duty and Reboiler duty.
04:17	Name these streams as C-Duty and R-Duty.
04:24	We are now ready to specify the Shortcut distillation column.
04:27	Click on it and select it.
04:30	Go to the Selected Object window.
04:32	Under theProperties tab, locate Connections menu.
04:37	The first option is Feed.
04:38	Let me click on Feed menu. A down arrow appears indicating a menu.
04:44	Click this arrow. Here we choose Feed.
04:48	Now, click on the next option which says Distillate.
04:51	Click on the drop-down arrow and select Distillate.
04:56	Similarly, for Bottoms, choose Bottoms.
04:59	The next option is Condenser Duty.
05:02	Let me click on it and select C-Duty.
05:07	Similarly, choose R-Duty for Reboiler.
05:12	This completes the connectivity of the flowsheet.
05:14	Under Properties tab, locate Parameters section.
05:19	This section is used to specify various attributes of a Shortcut Column.
05:25	In this section, the first option is Condenser.
05:30	By default, it is Total Condenser.
05:33	If a partial condenser is required, you can change it here.
05:36	Here, we leave it as it is.
05:39	Let us enter the Reflux Ratio. Click on it.
05:42	Here, we enter the value 2 in the field next to it.
05:49	We will specify the Product composition.
05:52	Let us first specify light key details in bottoms.
05:57	To do this, let me click light key.
06:01	Click the arrow and choose Benzene.
06:04	In the given field, on the next row, enter 0.05.
06:10	Similarly, for heavy key, choose Toluene.
06:15	Now we specify the heavy key in Distillate.
06:18	We enter 0.05.
06:23	Next in the list is Condenser Pressure.
06:26	The default value is 0 atmosphere. We will change it to 1 atmosphere.
06:32	Similarly, let us change reboiler pressure to 1 atmosphere.
06:37	Now we will run the simulation.
06:39	To do this, go to the Calculator options.
06:42	Click on the Play button. Now, click on the Recalculate button.
06:47	When the calculations are completed, click on the Shortcut column.
06:53	Under Properties tab, locate Results menu.
06:58	This shows all the required results like:
07:00	* Minimum Reflux Ratio
07:03	* Minimum Number of Stages
07:05	* Actual Number of Stages
07:07	* Optimal Feed Stage etc.
07:10	I have tabulated these results in a slide.
07:15	Let me save this simulation.
07:20	I have saved this as shortcut end.
07:24	Let me summarize.
07:26	We learnt: * how to specify a shortcut distillation column
07:29	* To specify key components, purities and minimum reflux ratio
07:34	* To use custom units
07:36	* To calculate- minimum reflux ratio, optimal feed location and total number of trays.
07:43	Let me give some assignments.
07:44	The assignment in this slide has to do with mass balances.
07:48	I use blue colour to indicate streams and equipment.
07:52	Let us go to the next assignment.
07:54	Carry out energy balance as mentioned.
07:58	Repeat the simulation with different product purities.
08:02	Determine how the energy requirement changes.
08:06	Repeat this simulation with different thermodynamics.
08:08	Repeat this simulation with different feed conditions.
08:12	Try to reason your results.
08:13	We have come to the end of this tutorial.
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09:14	Thanks for joining. Good bye.

Contributors and Content Editors

Nancyvarkey, PoojaMoolya, Pratik kamble, Sandhya.np14