prelim_pract1 - Engineering 219 Fall 2006 Recitation...

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Engineering 219 Fall 2006 Recitation: September 18 and 19, 2006 The following problems are from previous exams in this class. We will work them out during recitation today and show solutions. These problems do not have to be handed in. Problem 1 (suggested time: 15 minutes) A liquid mixture containing 30.0 mol% benzene (B), 25.0% mol% toluene (T), and the balance xylene (X) is fed to a distillation column. The bottoms product contains 96.0% X and no B, and 95.0% of the X in the feed is recovered in this stream. The overhead product is fed to a second column. The overhead product from the second column contains 97.0% of the B in the feed to this column. The composition of this stream is 94.0 mol% B and the balance T. A) Fill in the missing arrows and label (including units) knowns and unknowns in the flowchart below. Be sure to use the minimum number of unknowns in labeling your flowchart (based on the information above). B) Do a degree of freedom analysis of this problem to prove that for an assumed basis of
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