Unformatted text preview: 3. Run the simulation using three different property methods: IDEAL, WILSON, and NRTL. You will need to select the appropriate Base method under the Properties tab of the Data Browser. Also, for the WILSON and NRTL cases, select Wilson‐1 or NRTL‐1 under Binary Parameters to open a window that will allow the default parameters to be input (although you do not need to change or add any values to these windows). Be sure to Reinitialize and Save the results after each run. 4. Compare the results from the four different methods: SRK, IDEAL, WILSON, and NRTL. 5. Save yourwork. Page 4 of 10 PART IV. Design SpecificationCalculations Aspen PlusTM has the capability to perform iterative calculations over a range of an independent variable to optimize a process or to meet a design specification. We will use this capability to calculate the flow rate of an additional feed stream of MIBK to get our product water stream to have a purity of greater than 90%. 1. First, be sure that you are using the NRTL thermodynamic property method, the most realistic method for our process. (you may still get Warnings in the Control Panel if you have not cleared your previous Base methods. To do this open the Property Methods option under the Properties folder and delete all cases but the one you desire to use) 2. Reinitialize your simulation. 3. Update your spreadsheet by adding a second mixer and flash separator: connect the product stream from the first separator that is primarily water/acetone and a new MIBK feed stream to the mixer, and feed the mixed stream into the new separator. Rename the new MIBK stream “MIBK2”. Add 3 product streams to the flash separator. The updated process flowsheet should resemble Figure 4 below. Figure 4. Updated process flowsheet including two mixers and two separators. 4. Open the Data Browser. Input the following conditions for the MIBK2: a flow rate of 50 lbs/hr, a temperature of 75°F, and a pressure of 50 psi. The new mixer and flash separation units should be specified to be at 75°F and 50 psi. 5. Run the simulation. 6. Notice that the product stream o...
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- Spring '08
- Distillation, Acetone, reflux ratio, product stream, Aspen Plus™, RADFRAC, Data Browser