03-Lect-Conversion-Design Eqs0

03-Lect-Conversion-Design Eqs0 - Outline 1...

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1 Chemical Reaction Engineering - Musgrave Conversion and Design Equations Lecture 3 - Page 1 Outline: 1. Conversion (Fogler 2.1) 2. Batch Reactor Design Equations (Fogler 2.2) 3. Flow Reactor Design Equations (Fogler 2.3) Next Time: (Fogler 2.4-2.6) 1. Applications of the Design Equations (Folger 2.4) 2. Reactors in Series (Fogler 2.5) 3. Space Time and Space Velocity (Fogler 2.6) A F A0 F A Chemical Reaction Engineering - Musgrave Conversion and Design Equations Lecture 3 - Page 2 F A0 F A ,F B ,F C ,F D F B0 Consider the general reaction aA+bB cC+dD? • A, B, C and D identify the reactants and products • a, b, c, and d are stoichiometry coefficients . Stoichiometry coefficients tell the relative number of moles of reactant that react and product formed. For example, in the reaction: 2C 2 H 6 + 7O 2 4CO 2 + 6H 2 O 6 moles of H 2 O and 4 moles of CO 2 are produced from 2 moles of C 2 H 6 and 7 moles of O 2 . X A N A N A 0 Moles of A reacted Moles of A fed Conversion of A: It is convenient to define conversion in terms of the limiting reactant :
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2 Chemical Reaction Engineering - Musgrave Conversion and Design Equations Lecture 3 - Page 3 Process: 1. Place reactants into batch reactor. 2. Wait until given conversion is obtained. 3. Remove contents (products and unreacted reactants). Moles of A reacted = Moles of A reacted • Moles of A fed Moles of A Fed N A Initial charge at time t 0 is N A0 Moles of A left at time t is N A N A 0 N A = XN A 0 Moles of A reacted = Conversion • Moles of A fed The amount of A reacted is proportional to how much is fed to the reactor and the conversion Moles of A left = Moles of A fed - Moles of A reacted
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This note was uploaded on 04/25/2010 for the course CHEN 4330 taught by Professor Staff during the Spring '08 term at Colorado.

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03-Lect-Conversion-Design Eqs0 - Outline 1...

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