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CLSE 201 Chemical Engineering Fundamentals: Material Balances FALL 2014EXAM #2.You may use your book but not your notes. There are no trick questions. Use one side of engineeringpaper, begin each numbered problem on a new page, number the pages in order, show all your work, andboxyour answers. Make sure you write legibly. Partial credit willbe given if you show allyour work clearly. Whendone, put the pages in order, put this test page on top, staple together at the top left corner, and put your name onthe top right of the test page. Do NOT fold.1.The flowchart attached is part of an overall process that is used to dispose of solvent wastesgenerated in the paint and coating industry. The primary solvents that need to be disposed areEthyl Acetate (ETA) and Isopropyl alcohol (IPA). Inthis process, three streams of differingcompositions are mixed and the resulting stream isfed into an incinerator, where the solvents areburned. Stream #1 contains pure ETA, Stream #2 contains pure IPA, while Stream #3 contains bothETA and IPA.The incinerator is not too effective to completely oxidize all of the solvents and CO thus appearsin the exhaust gases. When this happens, 2% of the entering IPA and 5% of the entering ETAremain unburned. The unburned IPA and ETA are recycled back to form a new stream into themixer. Of the IPA that is burned, 80% is completely oxidized to CO2and 20% is only partiallyoxidized to CO. Similarly, 90% of the burned ETA is completely oxidized and 10% is partiallyoxidized.NOTE: All % are in mol%a. There are four variables that still need tobe labeled on this flowchart. The four variables areneeded to correctly label the flowchart. These have nothing to do with the conversion data above sothere is no need to label the given information. Find the four missing variables, label them andpleasecircle themso that I can find the answers easily¦..(10points)b. Complete the DOF analyses on the flowchart page. (There may be more lines in the DOFA boxesthan you need). For each piece of given informationthat you cite as a degree of freedom, use thejustification side to explain either 1) which flowchart variables that information will allow you todetermine or 2) which variables will be related by using that information (i.e., which variables willappear in an expression you will write using the information). Your justification phrases should takethe forms: find variable1 or find variable1 and variable2 or relate variable1 to variable2,variable3¦¦(20points)c. Completean analysis of the flowchart by systematically developing the equations required todetermine all of the variables on the flowchart. Dononumeric calculations. Number yourequations and be sure to include a short phrase next to each equation telling me what that equationis about. For example, phrases such as water balance or conversion relationship will suffice asexplanations¦..(35points)d. Using the variables on the flowchart, develop the auxiliary equations needed to calculatea. The fraction of water in the exhaust gas due to combustion of the ETA onlyb. Mole fraction of carbon dioxide in the exhaust gas on a dry gas basis.c. Yield of carbon monoxide based on the combined flow of both fuels¦..(20points)e. For the reactions involving only ETA, derive expressions for the output stream components from theincinerator in terms of the extents of reaction. Dononumeric calculations¦..(15points)NOTE: ALLÅ‘s are in kmol/hrDOF ANALYSESOn the mixer Justification On the Incinerator JustificationBONUS QUESTION:Fuels for motor vehicles other than gasoline are being evaluated as they generate lowerlevels of pollutants thandoes gasoline. Compressed propane has been suggested asa source of power for vehicles. Suppose that in atest, 20 kg of C3H8is burned with 400 kg of air to produce 44 kg of CO2and 12 kg of CO. What was the percentexcess air? ¦¦.(10points).
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