Unformatted text preview: Homework 5 Problem 1 Aspen Plus™ Residue Curves
20 points possible due Friday September 30, 2011 Grader: Alan Problem Statement: A feed containing 10 weight percent acetic acid in water and is to be extracted with a recycle flow of methyl‐isobutyl‐ketone (MIBK) that contains 0.1 weight percent acetic acid and 0.01 weight percent water. Both streams are fed at 500C and 1 atm. Construct a ternary equilibrium diagram for the water‐acetic acid‐
MIBK system. Method of Solution: Use Aspen PlusTM to generate a ternary diagram. Solution: 1) Open the ASPEN PLUSTM program. Typically, from the START menu: All Programs/AspenTech/Process Modeling v7.2/Aspen Plus/Aspen Plus User Interface 2) Select “Blank Simulation” and click OK. 3) Eventually, the Process Flowsheet Window should appear. Open the Data Browser by clicking on the icon on the toolbar. First, add the system components. Click on the Components folder in the Data Browser. Page 1 of 5 4) Click Find to open the Find window. Type “water” into the component name or formula field. Click Find Now. Highlight the correct component from the list of matches that appears and click Add. 5) Add acetic acid and MIBK to the components list in the same manner. When both components have been added, a blue check should appear next to the Components section of the Data Browser index. Page 2 of 5 6) In the Properties section, you will need to specify the method you would like Aspen PlusTM to use to solve the system. This step is by far the most important in obtaining accurate results. Select NRTL as the Base method. NRTL is a very detailed activity coefficient model that is most suitable for mixtures containing carboxylic acids operating at low pressures (less than 10 bar). button to automatically fill in the missing binary 7) Click the next interaction parameters. 8) Generally, you would continue to enter information until all required inputs were satisfied and the simulation could be run. However, in this case, we will use the components and property package that we have selected to generate equilibrium plots. From the Tools menu, select AnalysisPropertyResidue. Page 3 of 5 When the following message appears, click OK. 9) The Residue Curves window will open. Be sure that the Pressure is 1 atm (it should be the default), and then click Go. 10) A ternary plot will be generated, showing residue curves. Page 4 of 5 Results/Considerations: ASPEN PLUSTM is a very simple and effective tool when constructing and analyzing ternary equilibrium diagrams. Note that the open window behind the plot is a table of values used to construct the plot. Page 5 of 5 ...
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- Harry Connick, Jr., Hunter S. Thompson, percent acetic acid, Aspen Plus™