CHE_311_Winter_2009_Mid_Solutions

CHE_311_Winter_2009_Mid_Solutions - reactor configuration...

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CHE 311 Winter 2009 Mid-Term Exam Closed Book, Closed Notes (one index card, and calculator allowed). All answers go in this packet. Problem 1 (30 points) You have been asked to scale-up a liquid-phase process to obtain increased production of product. The reaction is A + B D, with the rate given by r D = kC A C B . Currently the process is carried out in a single 400 L CSTR. When operated at 298K with an input volumetric flowrate of 16 liters/min and inlet concentrations of species A = 3 mol/liter and of species B = 1.5 mol/liter, the reaction produces 1.2 kmol/hr of product D. For the scale-up, a second CSTR, 200 L in volume, is available to be used upstream of the current CSTR. If the volumetric flowrate is doubled to 32 liters/min and these two reactors are employed, will a higher conversion of the limiting reagent be achieved? What are the conversions for the original single reactor configuration and for the new two
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Unformatted text preview: reactor configuration? Problem 2 (18 points) The reaction A + B C is performed in a batch reactor with an excess of B and C A0 = 2.0 mol/L at a constant pressure of 1 atm (and constant T and V). The rate constant, k, is equal to 0.01 sec-1 . What time is required to achieve 49% conversion? Problem 3 (35 points) A gas-phase decomposition reaction, A 3B, has a rate of reaction that is –r A = kC A 2 , and the rate constant at the reaction temperature is 0.1 (liters·mol-1 ·min-1 ). The reaction is carried out in a constant pressure batch reactor starting with pure A with an initial concentration of 1 mol/liter. As part of this problem, a. build a stoichiometric table based on number of moles; b. derive the equation for time as a function of conversion and constants; and c. find the time required for 50% conversion....
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