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Latest revision as of 16:07, 21 August 2025

Title: Binary Phase Envelope

Author: Priyam Nayak

Keywords: DWSIM, Material stream, simulation, compounds, thermodynamic package, unit systems, bubble point curve, dew point curve, Pxy, Txy, equilibrium curve, video tutorial.


Visual Cue Narration
Slide Number 1

Title Slide

Welcome to this Spoken Tutorial on Binary Phase Envelope in DWSIM.
Slide Number 2

Learning Objective

In this tutorial, we will learn to generate:
  • Txy plot at a given pressure
  • xy plot for the obtained Txy data
  • Pxy plot at a given temperature
  • xy plot for the obtained Pxy data
Slide Number 3

System Requirements

This tutorial is recorded using
  • DWSIM version 8.8.0
  • Windows 11 OS

But, this process is identical in Linux, Mac OS X, or FOSSEE OS on ARM.

Slide Number 4

Pre-requisites

To practice this tutorial, you should know to
  • Add components to a flowsheet.
  • Select thermodynamic packages.
  • Add material stream
Slide Number 5

Problem Statement - I

Using DWSIM, we will generate:
  • Txy plot at a constant pressure of 1.5 bar
  • xy plot for the obtained Txy data
  • Pxy plot at a constant temperature of 300 C
  • xy plot for the obtained Pxy data
Slide Number 6

Problem Statement - II

The component system to be used is Ethanol-Water.

The envelopes are to be generated using the NRTL property package.

Desktop >> DWSIM To open DWSIM, go to the Desktop and double-click on the DWSIM icon.
DWSIM window opens. DWSIM window opens.
File >> New Chemical Process Model Click on File on the menu bar.

Select New Chemical Process Model.

Point to Simulation Configuration Wizard window

Click the Next button.

A Simulation Configuration Wizard window appears.

Click the Next button on the lower right corner of the window.

Point to Compounds tab

Type Ethanol in the search bar.

Check the check box under the Added column.

Point to Added Compounds

We are now in the Compounds tab.

We will add the compounds present in the flowsheet.

Type Ethanol in the search bar located at the bottom of the Compounds tab.

Under the Added column, check the checkbox for Ethanol.

Ethanol is added to the simulation as displayed against the Added Compounds.

Type Water in the search tab Similarly, add Water from Chemsep database.
Point to Added Compounds. All the compounds required for this simulation are added.
Click on the Next button at the bottom. Click on the Next button at the bottom to continue.
Point to Property Packages

Property Packages >> Available Property Package

Scroll down to find NRTL.

Click on Add.

Now comes Property Packages.

From the Available Property Packages, select NRTL.

Then click on Add.

NRTL has been added under Added Property Packages.

Click on the Next button at the bottom. Click on the Next button at the bottom to continue.
System of Units >> C5 Next option is the System of Units.

We will select C5 from the drop-down.

This unit has the desired system of units according to our problem statement.

Click on the Next button at the bottom. Click on the Next button at the bottom to continue.
Behavior >> Next We will not change anything here.

Click on the Next button at the bottom.

Undo/Redo Operation >> Finish We will not change anything here.

Click on the Finish button at the bottom.

This completes configuring the simulation.

Click and drag Material Stream to flowsheet Go to the Streams tab.

Drag and drop a Material Stream from the displayed list to the Flowsheet area.

Cursor at the stream. Let us arrange the Stream.
Clicking on the Stream, Property Editor Window opens.

Hover the mouse over the Property Editor Window

On clicking the Stream, the Property Editor Window opens.

We can see the Property Editor Window on the left-hand side of the Flowsheet.

Type Object as Feed. Let us rename the material stream first.

Under General Info, type the Object as Feed and Press Enter.

Point to Input Data To generate a binary phase envelope, let’s not modify any properties under Input Data.
Click Solve. However, let us run the material stream Feed with default data.

To do this, click on Solve.

Click on Utilities Now we will generate the Binary Phase Envelope for the added compounds.

To do this, go to Utilities.

Click on Add Utility Click on Add Utility.
Object Type >> Material Streams In the Add Utility window under Object Type, select Material Streams.
Utility Type >> Binary Phase Envelope Under Utility Type, select Binary Phase Envelope.
Flowsheet Object >> Feed Under Flowsheet Object, select Feed.
Click Add Utility Click on Add Utility.
Point to Binary Phase Envelope window Binary Phase Envelope window opens.
Drag the phase envelope window. Let us adjust the phase envelope window for better visibility.
Name >> Txy-plot Enter the Name as Txy-plot.
Point to Diagram Settings. Go to Diagram Settings.
Compound 1 >> Ethanol Select Ethanol as Compound 1, if not selected.
Compound 2 >> Water Let us select Water as Compound 2.
Envelope type >> Txy Select Envelope type as Txy, if not selected by default.
Txy Diagram Options >> VLE Select Txy Diagram Options as VLE, if not selected by default.
X-Axis Basis >> Mole Fraction Select X-Axis Basis as Mole Fraction, if not selected.
Pressure >> 1.5 bar Enter Pressure value as 1.5 bar.
Point to the temperature field. Here, we are going to plot a Txy diagram.

So let us not worry about the temperature value.

Point to NRTL Make sure that the property package is selected as NRTL
Click on the Calculate button at the bottom. Now click on the Calculate button at the bottom.
Point to Txy diagram

Point to X-axis

Point to Y-axis

The diagram generated is a Txy diagram or Constant Pressure Phase Diagram.

X-axis indicates the mole fraction of Ethanol.

Y -axis indicates the temperature range for which the VLE is generated.

Point to Bubble Point Curve The lower line of the envelope represents the Bubble Point Curve.
Point to lower line Ethanol mole fraction value

Point to bubble point temperature value

Hover the mouse to the lower line at Ethanol mole fraction of 0.5.

We can see the bubble point temperature to be 90.2541 deg C.

Point to the subcooled region. For any mixture composition below this line is a subcooled liquid.
Point to Dew Point Curve The upper line of the envelope represents the Dew Point Curve.
Point to upper line Ethanol mole fraction value

Point to dew point temperature value

Hover the mouse to the upper line at Ethanol mole fraction of 0.5.

We can see the dew point temperature to be 94.9215 deg C.

Point to the superheated vapour region. For any mixture composition above this line, the mixture is superheated vapour.
Point to VLE region The area enclosed between these two lines is the VLE region.

Here both vapor and liquid phases exist in equilibrium.

Point to Results section >> click on Table

point to the values.

We can see the bubble points and dew points at every composition.

For this, go to the Table tab under the Results section.

Here, we can see the corresponding mole fractions and temperature values.

Let us now generate the xy plot for data obtained in the above Txy diagram.
Utilities >> Add Utility Go to Utilities and click on Add Utility.
Object Type >> Material Streams In the Add Utility window, under Object Type, select Material Streams.
Utility Type >> Binary Phase Envelope Under Utility Type, select Binary Phase Envelope.
Flowsheet Object >> Feed Under Flowsheet Object, select Feed.
Click Add Utility Click on Add Utility.
Point to Binary Phase Envelope window Once again, Binary Phase Envelope window opens.
Let us adjust the window for better visibility.
Name >> xy-plot for T Enter the Name as xy-plot for T.
Go to Diagram Settings. Go to Diagram Settings.
Let the compound settings be the default settings.
Envelope type >> (T)xy Select Envelope type as (T)xy.
X-Axis Basis >> Mole Fraction Select X-Axis Basis as Mole Fraction, if not selected.
Pressure >> 1.5 bar Enter the Pressure value as 1.5 bar.
Click on Calculate button at the bottom. Now click the Calculate button at the bottom.
Point to xy diagram

Point to X-axis

Point to Y-axis

The diagram generated is called xy diagram.

X-axis indicates the mole fraction of Ethanol in liquid phase.

Y -axis indicates the mole fraction of Ethanol in the vapour phase.

Point to Equilibrium Curve The upper curve is the Equilibrium Curve.
Point to upper line Ethanol mole fraction value

Point to vapour phase mole fraction of ethanol value

Hover the mouse to the upper line at Ethanol mole fraction of 0.6.

We can see the vapour phase mole fraction of Ethanol to be 0.6962.

Let us generate the Pxy plot now.
Utilities >> Add Utility Go to Utilities and click on Add Utility.
Object Type >> Material Streams In the Add Utility window, under Object Type, select Material Streams.
Utility Type >> Binary Phase Envelope Under Utility Type, select Binary Phase Envelope.
Flowsheet Object >> Feed Under Flowsheet Object, select Feed.
Click Add Utility Click on Add Utility.
Point to the window. Once again, Binary Phase Envelope window opens.
Drag the window to adjust. Let us adjust the window for better visibility.
Name >> Pxy-plot Enter Name as Pxy-plot.
Go to Diagram Settings Go to Diagram Settings.
Let the compound settings be the default settings.
Envelope type >> Pxy Select Envelope type as Pxy.
X-Axis Basis >> Mole Fraction Select X-Axis Basis as Mole Fraction, if not selected.
Temperature >> 30 degree C Enter Temperature as 30 degC.
Here I am going to plot a Pxy diagram.

So let us not worry about the pressure value.

Property Package >> NRTL Make sure that the property package is selected as NRTL
Click on Calculate button at the bottom. Now click on the Calculate button at the bottom.
Point to Pxy diagram

Point to X-axis

Point to Y-axis

The diagram generated is a Pxy diagram or Constant Temperature Phase Diagram.

X-axis indicates the mole fraction of Ethanol.

Y -axis indicates the Pressure range for which the VLE is generated.

Point to Dew Points The lower line of the envelope represents Dew Points.
Point to lower line Ethanol mole fraction value

Point to dew point temperature value

Hover the mouse to the lower line at Ethanol mole fraction of 0.4.

We can see the dew point pressure to be 0.0678 bar.

Point to the line. For any mixture composition below this line is completely vapour.
Point to Bubble Points The upper line of the envelope represents Bubble Points.
Point to upper line Ethanol mole fraction value

Point to bubble point temperature value

Hover the mouse to the upper line at Ethanol mole fraction of 0.3.

We can see the bubble point pressure to be 0.0938 bar.

Point to the line. For any mixture composition above this line is completely liquid.
Point to VLE region The area enclosed between these two lines is the VLE region.

Here both vapor and liquid phases exist in equilibrium.

Point to Results section

Click on Table

We can see the bubble points and dew points at every composition.

For this, go to the Table tab under the Results section.

Here, we can see the corresponding mole fractions and pressure values.

Let us now generate the xy plot for data obtained in the above Pxy diagram.
Utilities >> Add Utility Go to Utilities and click on Add Utility.
Object Type >> Material Streams In the Add Utility window, under Object Type, select Material Streams.
Utility Type >> Binary Phase Envelope Under Utility Type, select Binary Phase Envelope.
Flowsheet Object >> Feed Under Flowsheet Object, select Feed.
Click Add Utility Click on Add Utility.
Point to Binary Phase Envelope window Once again, Binary Phase Envelope window opens.
Let us adjust the window for better visibility.
Name >> xy-plot for P Enter the Name as xy-plot for P.
Go to Diagram Settings. Go to Diagram Settings.
Let the compound settings be the default settings.
Envelope type >> (P)xy Select Envelope type as (P)xy.
X-Axis Basis >> Mole Fraction Select X-Axis Basis as Mole Fraction, if not already selected.
Temperature >> 30 degree C Enter Temperature value as 30 degC.
Click on Calculate button at the bottom. Now click the Calculate button at the bottom.
Point to xy diagram

Point to X-axis

Point to Y-axis

The diagram generated is called xy diagram.

X-axis indicates the mole fraction of Ethanol in liquid phase.

Y -axis indicates the mole fraction of Ethanol in vapour phase.

Point to Equilibrium Curve The upper curve is called the Equilibrium Curve.
Point to upper line Ethanol mole fraction value

Point to vapour phase mole fraction of ethanol value

Hover the mouse to the upper line at Ethanol mole fraction of 0.5.

We can see the vapour phase mole fraction of Ethanol to be 0.6654.

Slide Number 7

Summary

In this tutorial, we have learnt to generate:


  • Txy plot at a given pressure
  • xy plot for the obtained Txy data
  • Pxy plot at a given temperature
  • xy plot for the obtained Pxy data
This brings us to the end of this tutorial.

Let's summarize.

Slide Number 8

Assignment I

  • Txy plot at a constant pressure of 10132.5 Pa
  • xy plot for the obtained Txy data
  • Pxy plot at a constant temperature of 310 K
  • xy plot for the obtained Pxy data
As an assignment, generate the following.
Slide Number 9

Assignment II

The component system to be used is Ethanol-Toluene.

The envelopes are to be generated using UNIQUAC property package.

Slide Number 10

DWSIM Flowsheeting Project


The FOSSEE team coordinates the conversion of existing flowsheets into DWSIM.

We give honorarium and certificates for those who do this.

For more details, please visit this site.

We invite you to participate in DWSIM Flowsheeting Project.
Slide Number 11

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

We help you to migrate commercial simulator labs to DWSIM.
Slide Number 12


Acknowledgements

The FOSSEE project is funded by NMEICT, Ministry of Education(MoE), Government of India.
Slide Number 13


Thank You

We thank the DWSIM team for making it as an open source software.

Thank you for joining.

Contributors and Content Editors

Madhurig

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