Chap10Lecture5N - 10.5.4 Reactor Design This will be...

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Unformatted text preview: 10.5.4 Reactor Design This will be carried out in the following example. Example 10-3 Fixed Bed - Packed Bed Integral Reactor Hydrodemethylation of toluene in a packed bed reactor. Plot X, y (pressure ratio), P T , P H2 , P B as functions of catalyst weight, W. F To = 50 mol/min, P = 40 atm, T = 640 o C Feed contains 30 % T, 45 % H, 25 % I (inert) Hydrogen is in excess to prevent coking. The pressure drop parameter is 9.8 x 10-5 kg-1 . Also determine W in a CSTR if cat,e = 400 kg/m 3 . Reactor Design C 6 H 5 CH 3 + H 2 C 6 H 6 + CH 4 The reaction Solution 1. Design equation To T F ' r dW dX- = 2. Rate law T T B B T H T P K P K P kP ' r + + =- 1 k = 0.00087 mol/kg cat.atm 2 .min 2. Stoichiometry P T = C T RT = C To RT o y X X P y X X o T ) 1 ( ) 1 ( ) 1 ( ) 1 ( +- = +- = y To = 0.3(0) = 0 P T = P To (1-X)y P H2 = P To ( H2 -X)y H2 = 0.45/0.30 = 1.5 P H2 = P To (1.5 -X)y P B = P To X y Pressure drop parameter = 9.8x10-5 kg-1 Pressure can be integrated y = P/P o = (1- W) 1/2 P To = 0.3(40) = 12 atm 2. Stoichiometry2....
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Chap10Lecture5N - 10.5.4 Reactor Design This will be...

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