lecture 10 - CHE 349, Lecture 13 CHE 349: Kinetics and...

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CHE 349: Kinetics and Reactor Design Lecture 13 Jing Wu 350 Tiernan Department of Chemical Engineering ± jingwu@adm.njit.edu ² 973-642-7064 CHE 349 - Lecture 13 by Jing Wu 2 Assignment Required Reading Sec. 6.1-6.2 Homework: 6-6 CHE 349 - Lecture 13 by Jing Wu 3 Seldom is the reaction of interest the only one that occurs in a chemical reactor. Typically, multiple reactions will occur. To minimize of undesired side reactions that occur along with the desired reaction. Motivation to Study Multiple Rxn CHE 349 - Lecture 13 by Jing Wu 4 Reactor selection and general mole balances for multiple reactions. Three basic types of multiple reactions ³ series ³ parallel ³ independent Complex multiple reactions What Will We Study in Chapter 6
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CHE 349 - Lecture 13 by Jing Wu 5 Parallel reactions ( Competing reactions) Basic Models for Multiple Reactions A C B k 2 k 1 Series reactions ( Consecutive reactions) A C k 2 k 1 B Independent reactions A B C D + E CHE 349 - Lecture 13 by Jing Wu 6 Complex Reactions A + B C + D Combination of Parallel/Series Reactions A + C E CHE 349 - Lecture 13 by Jing Wu 7 The Economic Incentive A Reactor system Separator U D U k U A A k D D CHE 349 - Lecture 13 by Jing Wu 8 Maximizing the Desired Product in Parallel Reactions A k D D (desired) U k U A (undesired) 1 α A D D C k r = 2 A U U C k r = U D A r r r + = 2 1 A U A D A C k C k r + =
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CHE 349 - Lecture 13 by Jing Wu 9 The Rate Selective Parameter 2 1 α = = A U D U D DU C k k r r S Our Goal: Maximize S DU ! CHE 349 - Lecture 13 by Jing Wu 10 Maximize S DU , Case I: α 1 > α 2 a = 2 1 a A U D U D DU C k k r r S = = Keep the concentration of reactant A as high as possible during the reaction. If the reaction is carried out in the gas phase, we should run it without inerts and at high pressures to keep C A high. • If the reaction is in the liquid phase, the use of diluents should be kept to a minimum.
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lecture 10 - CHE 349, Lecture 13 CHE 349: Kinetics and...

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