DWSIM/C2/Binary-Phase-Envelope/English-timed
From Script | Spoken-Tutorial
| Time | Narration |
| 00:01 | Welcome to this spoken tutorial on Binary Phase Envelope in DWSIM. |
| 00:07 | In this tutorial, we will learn to generate: Txy plot at given pressure, |
| 00:14 | xy plot for the obtained Txy data, |
| 00:18 | Pxy plot at given temperature. |
| 00:22 | To record this tutorial, I am using DWSIM 5.2 (Classic UI) and Windows 10. |
| 00:32 | The process demonstrated in this tutorial is identical in other OS also, such as-
Linux, Mac OS X or FOSSEE OS on ARM. |
| 00:44 | To practice this tutorial, you should know to : add components to a flowsheet, |
| 00:51 | Select thermodynamic packages, |
| 00:54 | add material streams and specify their properties. |
| 00:59 | The pre-requisite tutorials are mentioned on our website. |
| 01:04 | You can access these tutorials and all the associated files from this site. |
| 01:10 | In this tutorial, using DWSIM, we will generate: Txy plot at a constant pressure of 1.013 bar, |
| 01:21 | xy plot for the obtained Txy data, |
| 01:25 | Pxy plot at a constant temperature of 75 degree centigrade. |
| 01:31 | Here we give compounds, inlet stream conditions and property package. |
| 01:38 | I have already opened DWSIM on my machine. |
| 01:43 | Go to File menu and select New Steady-state Simulation. |
| 01:50 | Simulation Configuration Wizard window appears. |
| 01:54 | At the bottom, click on the Next button. |
| 01:58 | Now, in the Compounds Search tab, type Ethanol. |
| 02:04 | Select Ethanol from ChemSep database. |
| 02:08 | Similarly, add 1-propanol. |
| 02:12 | At the bottom, click on the Next button. |
| 02:16 | The Property Packages opens. |
| 02:19 | From Available Property Packages list, double-click on Soave-Redlich-Kwong (SRK). |
| 02:26 | Then click on the Next button. |
| 02:30 | We are moved to a new window named Flash Algorithm. |
| 02:35 | From Default Flash Algorithm select Nested Loops(VLE). |
| 02:41 | At the bottom, click on the Next button. |
| 02:45 | Next option is System of Units. |
| 02:49 | Under System of Units, select C5. |
| 02:54 | At the bottom, click on the Finish button. |
| 02:58 | Let us maximize the simulation window for better visibility. |
| 03:03 | Let’s insert a material stream for which we have to generate the Txy, xy and Pxy plots. |
| 03:12 | On the right hand side of the main simulation window, go to Flowsheet Objects. |
| 03:19 | In the Filter List tab, type Material Stream. |
| 03:24 | From the displayed list, drag and drop a Material Stream to the Flowsheet. |
| 03:30 | Click on the Material Stream “MSTR-000” to view its properties. |
| 03:37 | Let’s change the name of this stream to Feed. |
| 03:41 | Now we will specify the Feed stream properties. |
| 03:46 | Go to Input Data. |
| 03:48 | Select Flash Spec as Temperature and Pressure (TP), if not already selected. |
| 03:55 | By default, Temperature and Pressure are already selected as Flash Spec. |
| 04:01 | Change Temperature to 30 degree Centigrade and press Enter. |
| 04:07 | Change Pressure to 3.5 bar and press Enter. |
| 04:13 | Change Molar Flow to 120 kmol/h and press Enter. |
| 04:20 | Now, let us specify the feed stream compositions. |
| 04:25 | Under Composition, choose the Basis as Mole Fractions, if not already selected. |
| 04:33 | By default, Mole Fractions will be selected as Basis. |
| 04:38 | For Ethanol, enter the Amount as 0.5 and press Enter. |
| 04:46 | Similarly, for 1-propanol, enter it as 0.5 and press Enter. |
| 04:54 | On the right side, click on this green tick to Accept Changes. |
| 04:59 | Now ,we will see how property package calculates phase equilibrium data of compounds. |
| 05:06 | To do this, go to Utilities. |
| 05:10 | Click on Add Utility. |
| 05:13 | In the Add Utility window, under Object Type, select Material Streams. |
| 05:20 | Under Utility Type, select Binary Phase Envelope. |
| 05:25 | Under Flowsheet Object, select Feed. |
| 05:29 | At the bottom, click on the Add Utility button. |
| 05:34 | Binary Phase Envelope window opens. |
| 05:37 | Let us adjust the phase envelope window for better visibility. |
| 05:43 | Enter Name as Txy-plot. |
| 05:49 | Go to Diagram Settings. |
| 05:52 | Select Ethanol as Compound 1, if not already selected. |
| 05:57 | By default, Ethanol is selected as Compound 1. |
| 06:02 | Make sure that the other compound is selected as Compound 2. |
| 06:07 | In this case, it is 1-propanol which is Compound 2. |
| 06:12 | Select Envelope type as Txy, if not already selected. |
| 06:19 | By default, Txy is selected as Envelope type. |
| 06:24 | Select Txy Diagram Options as VLE, if not already selected. |
| 06:31 | By default, VLE is selected as Txy Diagram Options. |
| 06:36 | Select X-Axis Basis as Mole Fraction, if not already selected. |
| 06:43 | By default, Mole Fraction is selected as X-Axis Basis |
| 06:48 | Enter Pressure as 1.013 bar. |
| 06:53 | Here we are going to plot a Txy diagram. |
| 06:56 | So, let's not worry about the pressure value. |
| 07:00 | Make sure that the property package is selected as Soave-Redlich-Kwong. |
| 07:07 | Now click on Calculate button at the bottom. |
| 07:12 | The diagram generated is a Txy diagram or Constant Pressure Phase Diagram. |
| 07:19 | X-axis indicates the mole fraction of Ethanol. |
| 07:23 | Y -axis indicates the temperature range for which the VLE is generated. |
| 07:29 | The lower line of the envelope represents Bubble Point Curve. |
| 07:34 | Hover the mouse to the lower line at Ethanol mole fraction of 0.5. |
| 07:40 | We can see the bubble point temperature to be 86.2853 degree Centigrade. |
| 07:47 | For any mixture composition below this line, is subcooled liquid. |
| 07:52 | The upper line of the envelope represents Dew Point Curve. |
| 07:57 | Hover the mouse to the upper line at Ethanol mole fraction of 0.5. |
| 08:03 | We can see the dew point temperature to be 89.5881 degree Centigrade |
| 08:10 | For any mixture composition above this line, the mixture is superheated vapour. |
| 08:16 | The area enclosed between these two lines is the VLE region. |
| 08:21 | Here, both vapor and liquid phases exist in equilibrium. |
| 08:26 | We can see the bubble points and dew points at every composition. |
| 08:32 | For this, go to Results section and click on Table. |
| 08:37 | Here we can see the corresponding mole fractions and temperatures values. |
| 08:43 | Let us now generate the xy plot for data obtained in the above Txy diagram. |
| 08:49 | Close this window. |
| 08:53 | Go to Utilities and click on Add Utility. |
| 08:58 | In the Add Utility window, under Object Type, select Material Streams. |
| 09:06 | Under Utility Type, select Binary Phase Envelope. |
| 09:11 | Under Flowsheet Object, select Feed. |
| 09:15 | At the bottom, click on the Add Utility button. |
| 09:19 | Once again, Binary Phase Envelope window opens. |
| 09:23 | Let us adjust the window for better visibility. |
| 09:27 | Enter Name as xy-plot. |
| 09:32 | Go to Diagram Settings. |
| 09:35 | Let the Compound settings be the default settings. |
| 09:39 | Select Envelope type as (T)xy. |
| 09:44 | Select X-Axis Basis as Mole Fraction, if not already selected. |
| 09:51 | By default, Mole Fraction is selected as X-Axis Basis. |
| 09:56 | Enter Pressure as 1.013 bar. |
| 10:01 | Now click on the Calculate button at the bottom. |
| 10:05 | The diagram is generated is called xy diagram. |
| 10:09 | X-axis indicates the mole fraction of Ethanol in liquid phase. |
| 10:15 | Y -axis indicates the mole fraction of Ethanol in vapour phase. |
| 10:20 | The upper curve is called Equilibrium Curve. |
| 10:24 | Hover the mouse to the upper line at Ethanol mole fraction of 0.6. |
| 10:30 | We can see the vapour phase mole fraction of Ethanol to be 0.7539. |
| 10:37 | Let us generate the Pxy plot now. |
| 10:41 | Close this window. |
| 10:45 | Go to Utilities and click on Add Utility. |
| 10:50 | In the Add Utility window, under Object Type, select Material Streams. |
| 10:57 | Under Utility Type, select Binary Phase Envelope. |
| 11:02 | Under Flowsheet Object, select Feed. |
| 11:06 | At the bottom, click on the Add Utility button. |
| 11:10 | Once again, Binary Phase Envelope window opens. |
| 11:14 | Let us adjust the window for better visibility. |
| 11:18 | Enter Name as Pxy-plot. |
| 11:23 | Go to Diagram Settings. |
| 11:25 | Let the Compound settings be the default settings. |
| 11:29 | Select Envelope type as Pxy. |
| 11:33 | Select X-Axis Basis as Mole Fraction, if not already selected. |
| 11:39 | By default, Mole Fraction is selected as X-Axis Basis. |
| 11:44 | Enter Temperature as 75 degree Centigrade. |
| 11:49 | Here, we are going to plot a Pxy diagram. |
| 11:53 | So, let us not worry about the temperature value. |
| 11:57 | Make sure that the property package is selected as Soave-Redlich-Kwong. |
| 12:03 | Now, click on Calculate button at the bottom. |
| 12:07 | The diagram generated is a Pxy diagram or Constant Temperature Phase Diagram. |
| 12:13 | X-axis indicates the mole fraction of Ethanol. |
| 12:17 | Y -axis indicates the pressure range for which the VLE is generated. |
| 12:23 | The lower line of the envelope represents Dew Points. |
| 12:28 | Hover the mouse to the lower line at Ethanol mole fraction of 0.4. |
| 12:34 | We can see the dew point pressure to be 0.523 bar. |
| 12:39 | For any mixture composition below this line, is completely vapour. |
| 12:45 | The upper line of the envelope represents Bubble Points. |
| 12:49 | Hover the mouse to the upper line at Ethanol mole fraction of 0.8. |
| 12:55 | We can see the bubble point pressure to be 0.782 bar. |
| 13:01 | For any mixture composition above this line, is completely liquid. |
| 13:06 | The area enclosed between these two lines is the VLE region. |
| 13:11 | Here, both vapor and liquid phases exist in equilibrium. |
| 13:16 | Now, go to Results section. Click on Table. |
| 13:21 | Here we can see the corresponding mole fractions and pressure values. |
| 13:27 | Let's summarize. |
| 13:29 | In this tutorial, we have learnt to generate: Txy plot at given pressure, |
| 13:34 | xy plot for the obtained Txy data, |
| 13:38 | Pxy plot at given temperature. |
| 13:41 | As an assignment, generate P(xy) plot for the Pxy data obtained. |
| 13:47 | Generate P(xy) plot using NRTL model. |
| 13:51 | Compare the results. |
| 13:53 | Watch the video available at following link. |
| 13:56 | It summarizes the Spoken Tutorial project. |
| 14:00 | The Spoken Tutorial Project Team conducts workshops and gives certificates.
For more details, please write to us. |
| 14:09 | Please post your times queries in this forum. |
| 14:13 | The FOSSEE team coordinates conversion of existing flow sheets into DWSIM.
We give honorarium and certificates. |
| 14:22 | For more details, please visit this site. |
| 14:26 | The FOSSEE team coordinates coding of solved examples of popular books. |
| 14:31 | We give honorarium and certificates. For more details, please visit this site. |
| 14:37 | The FOSSEE team helps migrate commercial simulator labs to DWSIM. |
| 14:43 | We give honorarium and certificates. For more details, please visit this site. |
| 14:49 | Spoken Tutorial and FOSSEE projects are funded by NMEICT, MHRD, Government of India. |
| 14:57 | This tutorial is contributed by Kaushik Datta and Priyam Nayak.
Thanks for joining. |
