lecture 7 - CHE 349, Lecture 8 CHE 349: Kinetics and...

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CHE 349: Kinetics and Reactor Design Lecture 9 Lecture 9 Jing Wu 350 Tiernan Department of Chemical Engineering ± jingwu@adm.njit.edu ² 973-642-7064 CHE 349 - Lecture 8 by Jing Wu 2 Assignments Reading: 4.1-4.6 Homework 4-5 (b-c) , 4-7(a-b) CHE 349 - Lecture 8 by Jing Wu 3 The Tasks of Chapter 4 Bring Everything Together to Arrive at a Logical Structure for Reactor Design. Solve by Reasoning Rather Than Memorization. Reactor Operated Isothermally CSTR – liquid phase PFR – gas phase pyrolysis CHE 349 - Lecture 8 by Jing Wu 4 Figure 4-1
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CHE 349 - Lecture 8 by Jing Wu 5 Figure 4-2 CHE 349 - Lecture 8 by Jing Wu 6 Basic Steps in Solving Reactor Design Limiting Species Rate Law (RL): (-r A ) = k C A C B Stoichiometry(ST): Express Concentration in terms of conversion. Combine RL and ST Æ combined RL Combine Design Equation with combined RL V ÅÆ X CHE 349 - Lecture 8 by Jing Wu 7 Definition of Conversion For Batch System X A = Moles of A Reacted Moles of A Fed N A = N A0 N A0 X A = N A0 (1– X A ) Moles of A in reactor at time t CHE 349 - Lecture 8 by Jing Wu 8 Design Eqn Using Conversion Batch Reactor A A r dt dN V = 1 N A = N A0 N A0 X A = N A0 (1– X A ) dt dN dV r F F j j V j j = + 0 V r dt dX N A A = 0
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CHE 349 - Lecture 8 by Jing Wu 9 V r dt dX N A A = 0
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lecture 7 - CHE 349, Lecture 8 CHE 349: Kinetics and...

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