lecture 11 - CHE 349 Kinetics and Reactor Design CHE 349...

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Unformatted text preview: CHE 349: Kinetics and Reactor Design CHE 349: Kinetics and Reactor Design Lecture 14 Lecture 14 Jing Wu 350 Tiernan Department of Chemical Engineering ¡ [email protected] ¢ 973-642-7064 CHE 349 - Lecture 14 by Jing Wu 2 Assignment Required Reading Sec. 6.1-6.3 Homework: 6-6, 6-11, 6-13 CHE 349 - Lecture 14 by Jing Wu 3 Complex Reactions Complex Reactions: A Combination of Parallel Reactions Series Reactions Algorithm for Complex Reactions Solve Simultaneous ODEs using software packages Use moles N j or molar flow rates F j rather than conversion. For liquid systems, concentration is preferred variable used in the mole balance equations. The resulting coupled differential equations can be easily solved using an ODE solver. CHE 349 - Lecture 14 by Jing Wu 4 Mole Balances Table 6-1 CHE 349 - Lecture 14 by Jing Wu 5 Net Rates of Reaction Having written the mole balances, the key point for multiple reactions is to write the net rate of formation of each species (e.g., A, B). Reaction 1: A + B 3C + D k 1A Reaction 2: A + 2C 3E k 2A Reaction 3: 2B + 3E 4F k 3B B A 2 1 + Reaction q : k q A G CHE 349 - Lecture 14 by Jing Wu 6 Net Rates of Reaction ∑ = = + + + + = q i iA qA A A A A r r r r r r 1 3 2 1 L ∑ = = + + + + = q i iB qB B B B B r r r r r r 1 3 2 1 L 2 2 2 C A A A C C k r = − 2 2 2 C A A A C C k r − = 3 2 j k ij ij C C k r − = CHE 349 - Lecture 14 by Jing Wu 7 Stoichiometry: Relative Rates of Reaction a A + b B c C + d D d r c r b r a r D C B A = = − = − i iD i iC i iB i iA d r c r b r a r = = − = − CHE 349 - Lecture 14 by Jing Wu 8 Stoichiometry: Relative Rates of Reaction...
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lecture 11 - CHE 349 Kinetics and Reactor Design CHE 349...

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