146_2009probset4 - ECH 146 Winter, 2009 Problem Set 4 Due...

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ECH 146 Winter, 2009 Problem Set 4 Due 1/30/09 This problem set continues our exploration of chemical kinetics combined with mole balances for ideal reactors. It will require some study of the textbook for material not covered in class. 1. A first order reaction A B is well described by the rate expression – r = k A C A . The rate constant k A is tabulated over a range of temperatures below. Temperature, K Rate Constant k A , s –1 350 0.00115 375 0.0253 400 0.379 425 4.13 450 34.4 Assuming negligible volume change upon reaction and a volumetric flow rate of 20 L/s, estimate the volume of CSTR required to obtain 90% conversion for the following two temperatures: 360 K, 412K. 2 . The chemical reaction 3A + 2B  P 1  + P 2  is believed to occur via the following sequence of elementary reactions: Step (1)  A + A    I 1 Step (2) I 1  + B   P 1  + I 2 Step (3)  I 2  + B   I 3 Step (4)  I 3  + A   P 2
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146_2009probset4 - ECH 146 Winter, 2009 Problem Set 4 Due...

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