00:00Before starting the simulation, make sure that DWSIM software is installed on the computer.
00:07Step 1. Open DWSIM. From the desktop, select Start and then select Programs.
00:13Next, select DWSIM folder and then DWSIM. DWSIM welcome window appears as shown here.
00:22Step 2. Complete Simulation Configuration Wizard. As discussed earlier,
00:27a new simulation is started by initializing the simulation configuration wizard
00:32by either clicking on the new chemical process model under the file menu or by clicking the new
00:39steady state simulation button on the button strip or by clicking the link create new under process
00:46modeling seen on the welcome screen. An introduction window will open as shown.
00:51Click Next button to get the compounds page. Start adding the components.
00:56Make sure that the components added are propane, isobutane, isopentane, and NXN.
01:03Click Next to get the property package sheet. Select at least one property involved
01:09and click Add button. Peng Robinson is the recommended package for this problem.
01:14Click Next button to get the system of units page. Select the units according to the problem
01:21statement, one after another, for all the properties given in the problem. For others,
01:26just leave it as it is. Make sure that the units for pressure as bar, temperature as degree,
01:32and mass flow rate as kg per hour or selector. Click Next to get the behavior page. Then click on
01:41Activate Smart Object Solving and then click Finish button. This completes the simulation configuration
01:47and now it is ready to construct the flow sheet. Step 3. Draw the flow sheet. On the main flow sheet
01:54window, a flow sheet can be drawn by using process equipment models available. From the object
02:00fillet that appears at the bottom of the main flow sheet window, choose the column, then shortcut
02:05column to select the required distillation column. Drag and drop the shortcut column on the flow sheet
02:11and double click on the objects and edit the names. Since Smart Object Solving is already selected,
02:18it will automatically add all the necessary feed, product, and energy streams associated with it,
02:24but with the default name for the object and numbers for the streams.
02:27Here, the streams are renamed as feed, top, bot, cduty, rduty, and the block as dc.
02:37Step 4 is to provide stream information. Just double click on the feed stream to edit and enter all the
02:44properties from the problem statement. Note that there are two tabs namely stream conditions and
02:50compound amounts. The basis and the units must be checked thoroughly. Since the feed is liquid mixture,
02:56the vapor fraction is zero. Only pressure and vapor fractions are available for the feed. Hence,
03:03flash calculation type can be chosen as pressure and vapor fractions PVF. Stream conditions and
03:10compositions are entered as given in the problem statement. After entering the values in each field,
03:15press enter key to save the values. Step 5. Configure the block. Double click on the block and enter all the
03:22information as given here. Select light and heavy key components and their compositions. The values of
03:30the reflex ratio, pressure of the end condenser, and reboiler are entered as given in the problem
03:35statement. After entering the values in each field, press enter key to save the values. Once entering all the
03:42values, the message will automatically appear as the flow sheet was calculated successfully, which is
03:47noticed at the bottom of the screenshot. Since all the necessary information is completely provided in this
03:53case, the flow sheet is automatically calculated. Alternatively, the simulation can be run by clicking
03:59the solve button, which will trigger an error message. On rectifying these errors, the flow sheet will be
04:04successfully calculated. As we had already discussed on how reports are generated, the results are tabulated using
04:13insert table option from the insert menu. Upon double clicking the button generated, we have to choose the
04:19properties to display in the table. For the property table, the object DC is chosen and the properties to
04:27be tabulated are reflex ratio, minimum reflex ratio, minimum number of stages, actual number of stages,
04:34optimal feed stage, condenser duty, and reboiler duty. These are the properties to be determined as given in the
04:41problem statement. For the master property table, all the feed and product streams were chosen and the
04:47properties selected were temperature, pressure, mass and molar flow rates and molar fractions of n-propane,
04:53isobutane, isopentane and n-exane. These tables and process flow diagrams can be moved by dragging or
05:01resizing by zooming in and out as per our need. Zooming can be done either through a mouse wheel or zoom button.
05:09Here, the PFD property table, master property tables were neatly arranged as shown.
05:16The simulation work can be saved and the results can be exported if required. The flow sheets or results
05:21table or any other graphics can be copied that they can be pasted into any Microsoft Office applications
05:28as usual. If needed, any of the input data can be modified to rerun the simulation. With this,
05:36we have completed the first simulation. Let us summarize what we have learned. We have discussed
05:41the steps involved in simulating a steady-state distillation column using DWSim software. By this,
05:47we have come to the end of this topic. Let us meet in another interesting session. Thank you, learners.
