Midterm%202%202007%20with%20Answers - ChE 211 NAME(print...

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NAME (print your name) ChE 211 Second Midterm Exam November 20, 2007 REMARKS : ( 1 ) Your work must be presented in the space provided for each problem. Anything written outside the specified space will be disregarded. ( 2 ) Your final result(s) must be presented in the box(es) provided at the end of each problem. Any empty box(es) will be considered as "NO" answer(s). ( 3 ) Any data necessary to solve problems should be found in the problem statements or in the textbook. You are not allowed to ask the instructor for any data . Problem 1. A liquid mixture containing 35.00 mole % benzene (B), 40.00 mole % toluene (T), and 25.00 mole % xylene (X) is fed to a distillation column at a rate of 500.0 kmol/h. The bottom product contains 97.22 mole % X and no B, and 98.00 % of the X in the feed is recovered in this bottom product. The overhead product is fed to a second column. The overhead product from the second column contains 96.00 % of the B in the feed to this column. The composition of this stream is 94.91 mole % B and 5.09 mole % T. Answer the following questions, paying attention to significant figures. (a) Find the flow rate, n 1 , of benzene in the top product of the first column. (10 points) (b) Find the total flow rate, n 5 , of the top product from the second column. (10 points) n 6 kmol B/h 0.3500 kmol B/kmol 0.4000 kmol T/kmol 0.2500 kmol X/kmol 0.0278 kmol T/kmol 0.9722 kmol X/kmol 0.9491 kmol B/kmol 0.0509 kmol T/kmol 500.0 kmol/h n 1 kmol B/h n 4 kmol/h n 5 kmol/h n 2 kmol T/h n 3 kmol X/h n 7 kmol T/h n 8 kmol X/h 175.0 kmol B/h 177.0 kmol/h
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Problem 2 . Suppose that each day the stalls of a small commercial dairy barn are washed down to remove all the manure, and this slurry is to be treated by a constructed wetlands (a natural system for wastewater remediation). A steady state process to remove solids from this slurry and prepare it for treatment in the constructed wetlands might proceed as follows.
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