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Unformatted text preview: HW2 6. From Felder and Roussea (10 points) 2 points for correct slope value (This is plotted on rectangular coordinates) 0.1 1 50 100 150 200 Time (min) (Ca-Cae)/(Ca0-Cae) 3 points for semi log graph (This is a semilog plot) 2.34 (b) Given that V = 30.5 gal, first calculate C A at 120 min, then performing mass balance to find the weight of B produced. ( 29 ( 29 ( 29 g gal gal L L g L g C C V C g B L g e L g L g L g C e C C C C kt C C C C A A B A kt Ae A Ae A Ae A Ae A 3 . 10 5 . 30 17 . 264 1000 ) / 0930 . / 1823 . ( * ) ( / 0930 . ) / 0495 . / 1823 . ( / 0495 . ) ( ln min 120 min 10 3 . 9 1 3 = - =- = = =- + =- + = - = ---- -- 3 points for correct B value 2.34 (c): Question: What is the reaction rate expression in a batch stirred tank reactor? Answer: r A = - k 1 C A + k-1 C B for a BSTR (Batch Stirred Tank Reactor) (2 points for the expression) As long as you have the rate expression above on your homework, you will receive full credit. K-1 = K2... Note that in this case r A = -r B , so an equivalent expression for r B = k 1 C A- k-1 C B. If you want a further explanation of the answers, please read below. The problem statement says A B implying an irreversible reaction, but you should not believe that it is irreversible once you have looked at the data. After an infinite amount of time,...
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- Fall '09