[Gates] 08WINTER - HWK4 SOLN

[Gates] 08WINTER - HWK4 SOLN - give a conversion of A of...

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ECH 146 Winter, 2008 Problem Set 4 Due 2/08/08 1. The data shown in the table below were obtained for the reaction A 2 B + C taking place in a batch reactor isothermally and with no volume change. The feed to the batch reactor was pure A. C A /molcm -3 t/min 62.5 0 50.0 10 41.7 20 35.7 30 31.3 40 27.0 50 23.8 60 a) Determine the residence time required to achieve 55% conversion in a PFR with the same initial concentration as the batch reactor. The volumetric flow rate is 100 cm -3 /min. Use a graphical method. b) Solve the problem a) using an analytical method. The rate equation is given as a A A kC r = - . 2. A first order ( A A kC r = - ) irreversible gaseous reaction A B occurs in 50 parallel tubes. The rate constant k are 1.52 × 10 -3 s -1 and 7.40 × 10 -2 s -1 at 93.3 o C and 148.9 o C, respectively. At what temperature should the reactor be operated to
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Unformatted text preview: give a conversion of A of 0.8 with a feed rate of 500 lb/h of pure A? The length and the diameter of each tube are 40 ft and ¾ -in, respectively. The molecular weight of A is 73. Assume the operating pressure of the reaction is 100 psig. 10 20 30 40 50 60 20 25 30 35 40 45 50 55 60 65 Fig 1.1: C A vs t Time, t (min) Concentration of A, C A (mol/cm 3 ) 20 25 30 35 40 45 50 55 60 65 0.5 1 1.5 2 2.5 3 3.5 4 Fig 1.2: -r A vs C A Concentration of A, C A (mol/cm 3 )-1/r A , cm 3 min/mol 3 3.5 4 4.5-2-1.5-1-0.5 0.5 1 1.5 Fig 1.3: ln(-r A ) vs ln(C A ) ln(C A ) ln(-r A ) 10 20 30 40 50 60 70 0.005 0.01 0.015 0.02 0.025 0.03 Fig 1.4: 1/C A-1/C A0 vs t t, min 1/C A-1/C A0 , cm 3 /mol...
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This note was uploaded on 02/13/2011 for the course ECH 146 taught by Professor Faller during the Winter '08 term at UC Davis.

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[Gates] 08WINTER - HWK4 SOLN - give a conversion of A of...

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