051209_hw6

051209_hw6 - Department of Chemical Engineering University...

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1 Department of Chemical Engineering Spring, 2009 University of California, Santa Barbara CHE 140A Problem Set No. 6 Due Tuesday, May 19, 2009 Problem 1: Fogler, 4-7 (a,b,e), pg. 238 The elementary gas-phase reaction (CH 3 ) 3 COOC (CH 3 ) 3 C 2 H 6 + 2CH 3 COCH 3 is carried out isothermally in a flow reactor with no pressure drop. The specific reaction rate at 50 °C is 10 -4 min -1 (from pericosity data) and the activation energy is 85 kJ/mol. Pure di- tert -butyl peroxide enters the reactor at 10 atm and 127 °C and a molar flow rate of 2.5 mol/min. Calculate the reactor volume and space time to achieve 90% conversion in: (a) A PFR (b) a CSTR (c) If this reaction is to be carried out isothermally at 127 °C and an initial pressure of 10 atm in a constant-volume batch mode with 90% conversion, what reactor size and cost would be required to process (2.5 mol/min X 60 min/h X 24 h/day) 3600 mol of di- tert - butyl peroxide per day? (Hint: Recall Table 4-1.) Problem 2: Fogler 4-10 (a-d), pg. 240 The growth of bacteria to form a product, P, is carried out in a 25 dm 3 CSTR (chemostat).
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This note was uploaded on 12/29/2011 for the course CHE 140b taught by Professor Ceweb during the Fall '10 term at UCSB.

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051209_hw6 - Department of Chemical Engineering University...

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