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2015-09-24T07:27:43Z

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{| style="border-spacing:0;"
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>'''Visual Cue'''</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>'''Narration'''</center>

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Slide 1</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Welcome to the spoken tutorial on Simulating a Rigorous distillation column in DWSIM.

My name is Kannan Moudgalya.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Slide 2</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| In this tutorial, we will carry out a rigorous simulation of a Distillation column.

We will learn to specify column pressure profile.

We will see where to specify tray efficiencies.

We will check whether the product compositions are as desired.

We will also learn how to view the column profiles.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Systems requirement slide
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| To record this tutorial, I am using DWSIM 3.4

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Prerequisite Slide
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| To practice this tutorial you should know

* How to open a simulation file in DWSIM
* How to add components to a flowsheet

* How to select thermodynamic packages

* How to add material and energy streams and specify their properties

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Prerequisite Tutorials and Files Slide</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Our website '''spoken tutorial''' dot '''org''' gives details of the prerequisite tutorials.

You can access these tutorials and also all the associated files from this site.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Slide for statement of problem solved Highlight file name</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| This slide shows the problem solved in one of the prerequisite tutorials.

This was solved using shortcut distillation.

Let us open the corresponding file in DWSIM.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Show DWSIM window, already made to the required size</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| I have already opened DWSIM.

I have already opened the file shortcut dash end dot dwxml

This file is available to you for download from our website '''spoken''' '''tutorial''' dot '''org'''.

Let me save this as '''rigorous.'''

You can see that the file name has changed now to '''rigorous.'''

|-

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Configure Simulation → Options→ Units System</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Click on the '''Configure simulation''' button.

Below the '''Thermodynamics '''tab, locate the '''Options '''menu.

Let me click it.

In the white space above it, you get an option called '''Units System'''.

Let me click it.

Locate '''Pressure''' on the right hand column.

Change its units to '''atmosphere.'''

Similarly, change the units of '''Delta_P''' also to '''atmosphere.'''

Change also the units of '''Molar flow rate''' to '''kilo moles per hour'''.

Click on '''Back to simulation.'''

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Let us switch to the slides.

The file we opened just now in DWSIM, solves the problem in this slide.

The solution is given in the next slide.

This problem was solved in the spoken tutorial on shortcut distillation.

These values form the basis for the rigorous distillation column problem.

You may want to write down these values in a piece of paper.

We will be using these values shortly.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Selected Object → Delete</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Let us begin by replacing the '''Shortcut column''' with a rigorous distillation column.

Let me go back to the simulation.

Press right click on the '''Shortcut column, '''and delete it.

Answer '''yes''' to the prompt.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Object Palette → Distillation Column→ Drag to flowsheet</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Locate the '''Distillation column''' in the '''Object palette'''.

Click on it and drop it in the place of shortcut distillation column.

You may have to adjust its position.

Click the column and select it.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Shortcut Column→ Selected Object→ Properties</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Go to '''Selected Object window.'''

Under the '''Properties '''tab, locate the '''Connections''' menu.

It is the third item.

In this, we can see '''Edit Connections'''.

Click on it.

Immediately after clicking it, a button appears at the right extreme.

A button with three dots.

Click on it.

Now there is a pop-up window.

Under the '''Feeds '''menu, click on the + button, which is the '''Add '''button.

Under '''To Stage '''column, the option is '''Condenser '''by default.

Here we have to specify the stage at which feed enters.

Click on the arrow next to the '''Condenser.'''

In my version of DWSIM, I had to click a second time.

We can see the list of stages.

Select the stage where we want the feed to enter the Distillation column.

Here we select '''Stage_6'''.

Now we will select the material stream.

Click on the down arrow below the '''Stream '''menu.

You may have to click this also twice.

Click on '''Feed'''.

We have done the pairing that the '''Feed''' should go to '''Stage_6.'''

The actual connection will be done later in the flowsheet.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Show the slide once</center>

<center>Highlight 6</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| This is as per the solution we got in the shortcut distillation column.

Let us see it in the slide, where we see the optimal feed location to be six.

Let us go back to DWSIM.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| In a similar way, you have to pair the product streams.

Pair the '''Condenser''' to '''Distillate.'''

Pair the '''Reboiler '''to '''Bottoms.'''

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Show the completed connections in the flowsheet</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Now we will connect heat duties to reboiler and condenser.

Pair '''C-Duty '''with '''Condenser''' and '''R-Duty '''with '''Reboiler'''.

We will now convert all the pairing into connections.

Click on any one of '''Feed''' or '''Condenser''' or '''Reboiler.'''

This completes the connections indicated by pairing.

We can move this and check.

You can see the connections have been made.

Let me close this.

Let me shift some streams to make it look more beautiful.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Distillation Column→ Selected Object→ Properties</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Click the '''Column''' and select it.

Under '''Properties '''tab, locate the '''Column Properties '''section.

It is the first option.

This section is used to specify the various attributes of a Distillation Column.

In this section, the first option is '''Condenser Pressure.'''

By default, it is '''1 atmosphere'''.

We will leave it as it is.

Next is the '''Reboiler Pressure'''.

I will change the value to '''1.1 atmosphere'''.

Using this, I will show how to establish a linear profile in the column.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Show slide. Highlight 14</center>

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Locate the '''Number of Stages''' option next.

You have to enter the total number of trays here.

Enter 15 here.

Because, this number includes the condenser also in DWSIM.

We plan to use a total condenser.

So, this number should be one more than the equilibrium stages given by shortcut method.

We got the equilibrium stages to be 14 from the shortcut method.

We can see it in the slide.

Let us go back.

The next option is '''Edit Stages.'''

Click it.

Press the button at the right extreme.

It shows the condenser and reboiler pressures as 1 and 1.1 atmosphere.

These are the values that we entered just now.

New stages that have been added have been assigned zero pressure, which is incorrect.

We would like the intermediate stage pressures to take interpolated values.

Go to the left column and click the interpolation symbol at the bottom.

Immediately, linearly interpolated values are assigned to every stage.

One may also change the pressure in any of the stages one through thirteen.

For example, I will click this pressure and change it to one atmosphere.

Let me undo this by pressing the interpolate button again.

This is a very useful and important method.

Whenever the number of trays changes, you will have to press the interpolate button.

If you forget this, there could be a lot of problems.

For example, there could be negative flow rates.

Remember to do this in Assignment 3 at the end of this tutorial.

One may also change the efficiency in one or more stages, as shown here.

Close this popup.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Highlight 1.47 in the slide

Highlight 61.1 in the slide
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Next we have the '''Condenser type'''.

For that, we have to go up.

By default, it is '''total condenser'''.

We will leave it as it is.

Next we have '''Condenser Pressure drop '''in atmosphere.

By default, it is '''0.'''

We will leave it as it is.

Next we have '''Condenser Specifications'''.

Under this menu, we have the type as '''Stream_Ratio '''by default.

Below this, we can see the '''Value''' menu.

Click on the field besides it.

Enter the required Reflux ratio.

Here we enter it as 2.

Recall that the minimum reflux ratio from the shortcut distillation was 1.47.

By multiplying 1.47 by 1.3 and rounding it off, we get 2.

Next we have '''Reboiler Specifications'''.

Under this menu, we have type as '''Product Molar Flow Rate '''by default.

Change the units to kmol/hr, if necessary.

We see the '''Value '''menu.

Enter the required Molar flow rate.

Here we enter it as '''61.1'''.

This is suggested by the shortcut solution.

We can see it in the slide.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Now we will select the solution method.

Locate the '''Solving''' '''Method '''option from the '''Properties''' tab.

It is item 7.

Click on the field besides it.

Click on the arrow on the right extreme.

We can see a list of solving methods.

Select '''WangHenke_BubblePoint'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Now we will run the simulation

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Calculator→ Play, Recalculate</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| To do this, go to the calculator options

Click on the '''Play''' button

Now click on the '''Recalculate All''' button

When the calculations are completed, click the product compositions.

Choose a stream, for example distillate.

You know how to check the product compositions from

the '''molar compositions '''option.

Next, click on the '''Distillation column'''.

Under '''Properties '''tab, locate the '''Results '''menu.

It is item 8.

This shows all the required results like

* Condenser Duty
* Reboiler Duty and
* Column Profiles

To see the '''Column profiles''', click on it.

We can see the button appearing on the right extreme.

Click on it.

Now we can see the pop-up window.

We can see the temperature and pressure profiles.

Flows profiles.

Component flows.

Component fractions.

If you want to know the exact numbers, use the Table tab to the right of the Graph tab.

Let me close this.

Let us save this file.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Slides</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Let me summarise.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Summary slide
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| We learnt how to simulate a rigorous '''Distillation column'''

* Specified pressure profile
* Found out where to give tray efficiencies
* Verify column profiles

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Let me give some assignments.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Assignment 1</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Repeat the calculations for a constant column pressure of 1atm.

That is, with reboiler pressure = 1atm.

Do you see major changes in the results?

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Assignment 2</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Next, simulate the distillation column at a constant pressure of 1 atmosphere.

That is, the reboiler pressure also is at 1 atmosphere.

If the reflux ratio is increased beyond 2, does the purity improve?

What reflux ratio should you use, if the actual purity is as desired.

In a future tutorial, we will show how '''sensitivity analysis''' can help do this easily.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Assignment 3</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| In the next assignment, we simulate the column at a reflux ratio of 2.

Keep the column pressure constant at 1 atmosphere.

Increase the total number of trays by 1.

That is, from 15 to 16.

As the number of trays has changed, you have to use the interpolate option.

This was mentioned earlier also.

With a larger number of trays, has the purity increased?

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Assignment 4</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| In the next assignment, we verify the following relationship:

Composition of vapour flow to the condenser = distillate product composition

Explain why this equation has to be satisfied.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Assignment 5</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| In the next assignment, check the consistency of the variables of the reboiler.

Use compositions, temperature and pressure at the reboiler for this purpose.

Do this through an equivalent flash calculation.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Assignment 6</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| In the last assignment, solve the problem by different '''Solving Method'''s.

Compare the answers.

Compare the computation times.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| We have come to the end of this tutorial

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>About the Spoken Tutorial project</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| This video summarises the '''Spoken Tutorial''' project.

If you do not have good bandwidth, you may download and watch it.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Spoken Tutorial workshops</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| We conduct workshops using '''Spoken Tutorials.'''

Give certificates.

Please contact us.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Forum</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Do you have questions in THIS '''Spoken Tutorial?'''

Choose the minute and second where you have the question.

Explain your question briefly.

Someone from the '''FOSSEE''' team will answer them.

Please visit this site.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>TextBook Companion</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| The FOSSEE team coordinates coding of solved examples of popular books.

We give honorarium and certificates for those who do this.

For more details, please visit this site.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Lab Migration</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| 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.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Acknowledgement</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Spoken Tutorial and FOSSEE projects are funded by NMEICT, MHRD, Government of India.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Thanks</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Thanks for joining.

|}

DWSIM-3.4/C2/Rigorous-Distillation/English - Revision history

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