Swansea University Prifysgol Abertawe EG-208 Process Design & Simulation Assignment 2 Weighting: 75% of Final Module Mark Issue Date: 22nd March 2024 Deadline Date: Submission: Via CANVAS Type of Assignment: Individual submission General Guidance: This assignment comprises of two parts. Part 1 Submission of Class Exercises (20 Marks) - Part 2 - Simulation of a binary distillation process (55 Marks) Submission points for each Part of the assignment will be made available on CANVAS. Details of what should be submitted for each part are provided with the guidance for each part and will be stated clearly on the CANVAS Submission point. Each submission point will allow you 2 attempts to upload the required files. Please read the guidance for each part of the assignment carefully. Academic Misconduct You can work in study groups to discuss the tasks in this assignment. But the documents and simulation files you submit for assessment must be your own individual work. Do not share your simulation files with colleagues. You must produce your simulation files using the ASPEN and UNISIM software available via Swansea University PC's. If your simulation files have been produced using versions of the software that are available external to the University, you run the risk of your simulation file not being compatible with the software available on University systems. If this is the case, you may be awarded ZERO marks and your submission referred for investigation into Academic Misconduct. If you do, you will run the risk of being reported for Academic Misconduct. For further information and guidance regarding Academic Misconduct can be found here: https://myuni.swansea.ac.uk/academic-life/academic-misconduct/ Page 1 of 8 Late Submission Please note the Faculty of Science & Engineering has a ZERO Tolerance policy on late submission. Be aware that CANVAS can sometimes report a submission LATE if it is submitted on the deadline. You are therefore advised to ensure you submit your work before the deadline. Page 2 of 8 Part 1 - Submission of Class Exercises (20 Marks) Over the course of the semester, you have been assigned weekly exercises to complete. This has been partly to demonstrate how the software packages work, but also to demonstrate how you approach solving the problems these exercises consider. For this part of the assignment, you are required to submit two exercises that you should have already completed during the semester. These are as follows: 1. Week 23: UNISIM Exercise - Synthesis Gas Production [10 Marks] 2. Week 25: ASPEN Exercise – Example of Modelling Solid Processes [10 Marks] File submissions for Part 1. You will be submitting 2 files for this part of the assignment. 1) A Synthesis gas UNISIM case file, please name your casefile as follows: studentnumber_A2_Part1_Unisim.usc. 2) An Aspen Plus document file, please name your file as follows: studentnumber_A2_Part1_Aspen.apw Please submit both files to the Canva submission point titled EG-208 Assignment 2 -Part 1 Submission. Page 3 of 8 Total Marks Part 1: 20 Marks Part 2 - Simulation and analysis of a continuous distillation system (55 Marks) You have been asked by your employer to investigate the initial design of a continuous distillation column to separate Benzene (C6H6) and n-Octane (C8H18). Your employer has suggested you work from a basis of a feed stream with a composition of 30 mol % benzene, and flow of 1000 kg/hr. The column is expected to produce a benzene product stream containing not more than 3 mol% n-Octane, and similarly not more than 1 mol% benene should be present in the n-Octane product stream. You may assume the column is operating at atmospheric pressure. You are expected to: • • Determine the vapour liquid equilibria for the system using ASPEN Plus. Perform initial calculations to determine: ○ The minimum reflux ratio. ○ Number of ideal stages in the column. О Location of the feed tray for the column о • • Condenser and Reboiler energy duties in kW. Use the DSTWU Column in ASPEN Plus to simulate the separation. Use the RADFRAC Column in ASPEN Plus to simulate the separation. Present the results your hand calculations and the simulations in a PDF Document. You should analyse the results and recommend key operating parameters for the column, such as reflux ratio, number of stages, the feed tray location, condenser and reboiler duties. Determining the vapour liquid equilibria for the system using ASPEN Plus. Use the Property Analysis Tools in ASPEN Plus to generate the vapour liquid equilibria data for the system. You will need to identify a suitable ‘Property Method' that represents this system. [5 Marks] Initial calculations to determine minimum reflux ratio and number of ideal stages. Using the vapour liquid equilibria (VLE) data that you have generated; you should apply the McCabe Thiele Method to estimate the minimum reflux ratio for the column and for a suitable reflux ratio you have chosen, estimate the number of ideal stages required to achieve the separation and the location of the feed tray. Important: You should state any assumptions you make clearly. You may need to export the data into Excel, or something similar, to enable you to apply the McCabe Thiele method. [6 marks] Page 4 of 8 Verify the values you have obtained from the McCabe Thiele Method by applying the following shortcut distillation calculations. Fenske Equation Underwood Equation Gilliland Correlation Kirkbride Equation XB log D Nmin log(x) XA Rmin = 1 XDA x-1 XFA x- W (1-XDA) (1-XFA) Rmin\ 0.5668 N-Nin=0.75(1-(-i)) R+1 2 Nr (XB XA,in W In = 0.206 In \NS. F XB,in D Ꭰ Nomenclature N = number of stages in column, (the reboiler is considered a stage) Nmin = minimum number of stages in column Nr = number of stages above the feed, including any partial condenser Ns = number of stages below the feed, including the reboiler. R = reflux ratio. Rmin minimum reflux ratio = XA = mole faction of most volatile component XB = mole fraction of least volatile component a = average relative volatility of component A with respect to component B D = Distillate product molar flow in kmol h-1 W = Bottom product molar flow in kmol h¹ Subscripts F, D, W refer to feed, distillate and bottom product respectively. Condenser and Reboiler Duties [4 marks] For the reflux ratio that you have chosen; perform an energy balance over the distillation unit and determine the condenser and reboiler duties in kW. Important: You will need find relevant thermodynamic data to perform these calculations. Clearly state any assumptions that you make and cite all sources that you have used. Page 5 of 8 [5 marks]