Difference between revisions of "DWSIM/C3/Chemsep-Distillation-Column/English"

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Latest revision as of 16:00, 5 February 2020

Visual Cue Narration
Slide Number 1

Title Slide

Welcome to this tutorial on simulating a Chemsep Distillation Column in DWSIM.
Slide Number 2

Learning Objectives

In this tutorial, we will learn to
  • Specify properties of a Chemsep column and
  • Simulate a Distillation column
Slide Number 3

System Requirements

To record this tutorial, I am 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 practice 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

DWSIM-Chemsep file used in the tutorial is provided as a Code file on this tutorial page.

Download the file from Code Files link.

Slide Number 7

Components: Furfural & Ethyl Acetate

Thermodynamics: UNIFAC

Inlet Stream:

Mole Fraction(C5H4O2): 0.879

Mole Fraction(C4H8O2): 0.121

Temperature: 397 K

Pressure: 101325 Pa

Molar Flow: 616.177 mol/s

We will develop a flowsheet to determine Outlet stream properties after Distillation.


Here we give Compounds, Thermodynamics and Inlet stream conditions.

Slide Number 8

Citation

An, Y., Li, W., Li, Y., Huang, S., Ma, J., Shen, C., & Xu, C. (2015)

Design/optimization of energy-saving extractive distillation process by combining preconcentration column and extractive distillation column

Chemical Engineering Science, 135, 166-178

I have taken this problem statement from a paper published in Chemical Engineering Science.


For reference, I am citing the paper here.

I have already opened DWSIM on my machine.
File >> Open File Go to File menu and click on Open File.
Point to the file on the Desktop.


Select the file from the Desktop.

I have already downloaded and extracted the file on my Desktop.

Select the file from the Desktop.

Click on Maximize button. Let us maximize the simulation window.
Point to material and energy streams This file contains all material and energy streams necessary for this tutorial.
Now let us insert a Distillation Column into the flowsheet.
Click and drag Shortcut column to the flowsheet At the bottom of the main simulation window, go to CAPE-OPEN tab.
Click and drag CAPE-OPEN Unit Operation to the flowsheet Click on the CAPE-OPEN Unit Operation displayed.

Drag and drop it to the flowsheet.

Point to Add CAPE-OPEN Unit Operation Add CAPE-OPEN Unit Operation window opens.
Select ChemSep

Click Ok

Select ChemSep from the displayed list of Unit Operations.

This list may vary depending on CAPE-OPEN Unit Operations that have been installed in your system.

At the bottom, click on the Ok button.

Let us now arrange it as required.
Click on the added CAPE-OPEN Unit Operation Click on the added CAPE-OPEN Unit Operation (COUO-005)
Type Distillation Column We will change the name of the object to Distillation Column.
First, we will connect the inlet feed streams.
Go to Connections

Click on drop down arrow against feed

Select Feed

Click on the Distillation Column.

Go to the left side of the window.

Under Connections, go to the Inlet section.

Click on the drop-down against feed and select Feed.

Click on Open CAPE-OPEN Object Editor button Click on Open CAPE-OPEN Object Editor button in the Object Property Editor window.
Cursor to New Unit Operation New Unit Operation pop-up window appears.
Unit Name >> Distillation Column. Click on the field against Unit Name and type Distillation Column.
Click on OK button. We will specify the rest of the details in a while.

Click on the OK button at the bottom.

Point to ChemSep (CAPE-OPEN) - Distillation Column The ChemSep (CAPE-OPEN) -Distillation Column window will appear.
Click on CAPE-OPEN Click on CAPE-OPEN on the left side of the ChemSep window.
Point to Distillation Column section Under Distillation Column section, there is a checkbox against CAPE-OPEN Properties.

This checkbox is checked by default.

Cursor to CAPE-OPEN Properties This checkbox is to indicate if the column is to be simulated with
  • the CAPE-OPEN thermodynamics
  • or the native thermodynamics available with the column.

We will use the native thermodynamics available with the column.

Uncheck the checkbox against CAPE-OPEN Properties. So we will uncheck the checkbox against CAPE-OPEN Properties.
Distillation Column >> Expose energy port Next, we have Expose energy ports.

This is to indicate if the energy connection ports are to be exposed to connect them to energy stream.

This is needed if the energy streams are to be connected and used later for energy recycling.

Else it can be unchecked.

Check the Expose energy port check-box For demonstration purposes, let us see how to connect the energy streams.

Therefore, check the Expose energy ports check-box.

Click on Save problem to file button Click on Save problem to file button on the toolbar.
Click the cross button Close the ChemSep window by clicking the cross button at the top right corner of the window.
Click Yes A pop-up appears, in which we will click Yes.
Now we will connect the outlet material streams with the column.
Click on Distillation Column >> left side >> Under Connections >> Outlet Click on the Distillation Column.

Go to the left side of the window.

Under Connections, go to Outlet section.

Go to Connections

Click on the drop down against TopProduct

Select Distillate

Then click on the drop-down against TopProduct and select Distillate.
Click on the drop down against BottomProduct >>Select Bottoms Click on the drop-down against BottomProduct and select Bottoms.
Now we will connect the energy streams with the column.
Go to Energy section

Click on the drop down against Reboiler heat duty

Select R-Duty

Go to the Energy section.

Then click on the drop-down against Reboiler heat duty.

Select R-Duty.

Click on the drop down against Condenser heat duty

Select C-Duty

Now click on the drop-down against Condenser heat duty.

Select C-Duty.

Now we will edit the properties of the Column.
Click on Open CAPE-OPEN Object Editor. Click on Open CAPE-OPEN Object Editor button.
Point to the window. The ChemSep window opens.
Click on Components Click on Components on the left side of the ChemSep window.
Point to the feed streams We have already connected the feed streams to the column.

So the components are already listed here.

Click on Operation Click on Operation on the left side of the ChemSep window.
Select Type of Simulation >> Equilibrium column Under Select Type of Simulation section, Equilibrium column is selected by default.

We are simulating a distillation column which is an equilibrium operation.

So we will leave it as it is.

Configuration >> Operation >> Simple Distillation Now we will move to Configuration section.

Under Configuration, select Operation as Simple Distillation, if not already selected.

By default, Simple Distillation is already selected as Operation.

Condenser >>Total (Liquid Product) Select Condenser as Total (Liquid Product), if not already selected.

By default, Total (Liquid Product) is already selected as Condenser.

Reboiler >> Partial (Liquid Product) Select Reboiler as Partial (Liquid Product), if not already selected.

By default, Partial (Liquid Product) is already selected as Reboiler.

Number of stages >> 25 Next we will enter the Number of stages and Feed stage.

Type the Number of stages as 25 and press Enter.

A pop-up appears, in which we will click Yes.

Feed stage >> 11 Type the Feed stage as 11 and press Enter.
Click on Properties Click on Properties on the left side of the ChemSep window.
Here we will define the Thermodynamics, Physical Properties and Reactions taking place in the column.
First, we will define the Thermodynamics.
K-value >> DECHEMA Click on the drop-down against K-value.

Select DECHEMA.

Activity coefficient >> UNIFAC Next, click on the drop-down against Activity coefficient and select UNIFAC.
Vapour pressure >> Antoine Next, click on the drop-down against Vapour pressure and select Antoine.
Enthalpy >> Ideal Next, click on the drop-down against Enthalpy and select Ideal.
There are no Physical Properties or Reactions to be defined.

So, we will not specify them.

Click on Feeds Now click on Feeds.

The feed stream is already connected to the column.

So the feed stream properties are already displayed here.

We will not change anything.

Click on Pressures Now we will see how to define Pressure Profiles in Chemsep Column.

Click on Pressures on the left side of the ChemSep window.

Column pressure >> Constant pressure


Condenser Pressure >> 101325 N/m2

Click on drop-down against Column pressure.

Select the pressure profile to specify for the column depending on pressure data available.

By-default, Constant pressure is selected.

We will not change that as the column is operated at constant pressure.

Enter Condenser Pressure as 101325 N/m2

Top Pressure >> 101325 N/m2 Enter Top Pressure as 101325 N/m2
Click on Column Specs Next click on Column Specs on the left side of the Chemsep window.
Point to Column Product Specification

Top specification >> Reflux ratio

Go to Column Product Specifications section.

Select the Top specification as Reflux ratio, if not already selected.

By default, Reflux Ratio is already selected as Specification.

Reflux Ratio >> 1.018 Beside that we can see a value field.

Here we will enter Reflux Ratio as 1.018 and press Enter.

Bottom specification >> mole fraction of a component

Enter the value as 0.01

Now select the Bottom specification as mole fraction of a component,

Enter the value as 0.01 and press Enter.

Choose Ethyl acetate Below that, from the drop-down select Ethyl acetate.
Click on Save problem to file button Click on Save problem to file button on the toolbar.
Close the ChemSep window Close the ChemSep window.
Now we will run the simulation.
Click Solve Flowsheet To do this, click on Solve Flowsheet button on the toolbar.
Click on the Distillate

Ethyl Acetate composition: 0.99

When the calculations are completed, click on Distillate in the flowsheet.

From the Property Editor window, go to Input Data tab.

Under Compounds Amounts tab, we can see that the Ethyl Acetate composition is 0.999.

Click File and Save As Let me save this simulation with the name Chemsep-Distillation.
Let's summarize.
Slide Number 9


Summary

In this tutorial, we have learnt to:
  • Specify properties of a Chemsep column and
  • Simulate a Distillation column
Slide Number 10

Components: Benzene & Toluene

Thermodynamics: Raoult’s Law

Inlet Stream:

Mole Fraction(C6H6): 0.6

Mole Fraction(C7H8): 0.4

Temperature: 397 K

Pressure: 101325 Pa

Molar Flow: 100 kmol/h

As an assignment, repeat this simulation with different compounds.


Different feed conditions

Slide Number 11

Column Configuration:

No of Stages: 20

Feed Stage: 10

Reflux Ratio: 2.3

Mole Fraction of Benzene in Bottoms: 0.01

Different Column Configuration
Slide Number 12


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 13

Spoken Tutorial Workshops

The Spoken Tutorial Project Team
  • Conducts workshops and
  • Gives certificates.
  • For more details, please write to us.
Slide Number 14

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 timed queries in this forum.
Slide Number 15

DWSIM Flowsheeting Project

The FOSSEE team coordinates conversion of existing flow sheets into DWSIM.

We give honorarium and certificates for those who do this.

For more details, please visit this site.

Slide Number 16

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 17

Acknowledgements

Spoken Tutorial and FOSSEE projects are funded by NMEICT, MHRD, Government of India.
Slide Number 18

Thanks

This tutorial is contributed by Kaushik Datta and Priyam Nayak.

Thanks for joining.

Contributors and Content Editors

Kaushik Datta, Nancyvarkey

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