Lecture 10 9-14-11 - Exam #1(Closed Book) General Approach...

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1 Chapter 4: Material Balances Multiple-Unit Processes Recycle, Bypass, Purge Streams Exam #1(Closed Book) Wednesday, September 21, 2011 7:00 - 9:00 p.m. PHSC Room 108 AICHE Meeting 6:30-7;30 pm Wednesday Sept. 14 Willoughby Lounge (Pizza) Extra Credit 5 pts General Approach to Solving Material Balance problems: 1. Read the problem until you understand it. 2. Draw and label a flow chart, 3. Do a degree of freedom analysis, 4. Lay out a solution strategy i.e. state any assumptions, acquire any missing data, simply the mass equation, define the system to analyze 5. Write Mass Balance equations for the system you defined 6. Solve for the required quantities. Multiple Units Example Acetone is used in the manufacture of many chemicals and also as a solvent. In this latter role, many restrictions are placed on the release of acetone vapor to The environment. You are asked to design an acetone recovery system having the flowsheet illustrated below. All the concentrations shown in the figure of both the gases and liquids are specified in weight percent in this special case to make the calculation simpler. Calculate: A, F, W, B, and D per hour. Given G=1400 kg/hr.f
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Lecture 10 9-14-11 - Exam #1(Closed Book) General Approach...

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