# Lec10 - -=-= = = = ρ k MW C F v F C C V B B B B A = Finding the Rate Law(Done in a batch reactor A A A A A r dt dC V r V r dt dN = = = Assume

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Lecture 10 Tuesday 2/5/08 Definition of Selectivety Instantaneous S D / U = r D /r U Overall = F D /F U Semibatch Reactors Read Problem P4-23 on page 246 before Lecture begins

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Semibatch and Rate Law Intro Semibatch reactors example: A + B → C + D A B, v 0 Initial V t v V V v dt dV dt dV V V m v m t v dt dm 0 0 0 0 0 0 + = = = = = = ρ 1) Mole balances: A: in – out + gen = acc 0 - 0 + r A V = dN A /dt B: F B – 0 + r B V = dN B /dt dt dV C dt dC V dt V C d dt dN A A A A + = = ] [ t v V V V C v r dt dC V C v r dt dC V C C v r dt dC V C v r dt dC D D D C C C B B B B A A A 0 0 0 0 0 0 0 5 4 3 ) ( 2 1 + = - = - = - - = - =

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2) Rate Law: 3) Stoich: 4) Parameters: V C N V C N N N N X r r r r r r r r r r C kC r A A A A A A A A D A C A B D C B A B A A = = - = - = - = = = = - = - = 12 11 10 9 8 7 1 1 1 1 6 0 0 0 0 0 0 0 0 0 , , , , B A C k v V C
example: A + B → C + D + CO 2 1) Mole balances: mass balances: 2) Rate law: A B, v 0 CO 2 ρ MW V r v dt dV dt dV MW F v MW F m v m V m dt dm m m F V r V r dt dN V r dt dN F V r dt dN V r dt dN CO CO CO i CO CO D D C C B B B A A - = = - = = = = - - = = = + = = 2 2 2 2 2 0 0 0 0 0 0 6 0 5 4 3 2 1 B A A C kC r - =

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3) Stoich: 4) Parameters: 0 0 CO B A 13 12 1 1 0 1 9 C 8 7 2 A A A A A D A C A B B A N N N X r r r r r r r r V N V N C - = - =
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Unformatted text preview: -=-= = = = ρ , , , , , , , k MW C F v F C C V B B B B A = Finding the Rate Law (Done in a batch reactor) A A A A A r dt dC V r V r dt dN = = = Assume power law relation: Guess and check for α = 0, 1, 2 and check against experimental plot α A A A A kC dt dC kC r-= =-kt C C kt C C kt C r A A A A A A =-= -= = = = 1 1 ln 2 1 t t t C A 1/C A ln(C A0 /C A )...
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## This note was uploaded on 09/28/2011 for the course CHEMICAL E 534 taught by Professor Fogler during the Spring '11 term at University of Michigan-Dearborn.

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Lec10 - -=-= = = = ρ k MW C F v F C C V B B B B A = Finding the Rate Law(Done in a batch reactor A A A A A r dt dC V r V r dt dN = = = Assume

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