lec9 - TO = 0.2, F A0 = 5, k = 4, K C = 0.0004, k C = 8 1)...

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Lecture 9 Thursday 1/31/08 Membrane Reactors : Used for Thermodynamically Limited Reactions Balances in Terms of Molar Flow Rates Block 1: Mole Balances Balance Equation on Every Species Block 2: Rate Laws Relative Rates Transport Laws Block 3: Stoichiometry Block 4: Combine Multiple Reactions: Selectivety and Yield
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Membrane Reactors Dehydrogenation Reaction: C 3 H 8 ↔ H 2 + C 3 H 6 A ↔ B + C Thermodynamically Limited: W = ρ b V ρ b = (1- ϕ C 1) Mole Balance: A: In – out + generation = 0 R B = A: B: In – out – out membrane + generation = 0 B: reactor of volume sides through B of moles 0 0 0 = - - + V r F F A V V A V A A A r dV dF = - X C X C T T endothermic exothermic A,B,C sweep F A0 B B A,C stay behind since they are too big H 2 H 2 C BS 0 = + - - + V r V R F F B B V V B V B ) ( B B B R r dV dF - = -
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) ( ` BS B C B C C k W - = D L DL a D 4 lume reactor vo area surface membrane 4 2 = = = π [ ] BS B C B B C C a k a W R - = = ` [ ] BS B C B C C k R - = Neglected most of the time Parameters: C
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Unformatted text preview: TO = 0.2, F A0 = 5, k = 4, K C = 0.0004, k C = 8 1) 2) 3) 4) Relative rates: 5) 6) 7) (isothermal, isobaric) 8) 9) 10) A A r dV dF =-B B B R r dV dF-= C C r dV dF = --= C C B A A K C C C k r 1 1 1 C B A r r r = =-T A T A F F C C = T B T B F F C C = T C T C F F C C = C B A T F F F F + + = C A B A r r r r-=-= , B C B C k R = Multiple Reactions ) (Undesired (Desired) 2 2 B A U U k B A D D k C C k r U B A C C k r D B A U D = + = + Selectivity Yield Instantaneous S D/U = r D /r U y D = r D /-r A Overall D/U = F D /F U D = F D /(F A0-F A) B U A D B A u B A D U D U D C k C k C C k C C k r r S = = = 2 2 /...
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lec9 - TO = 0.2, F A0 = 5, k = 4, K C = 0.0004, k C = 8 1)...

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