Lecture 9 Thursday 1/31/08 Membrane Reactors : Used for Thermodynamically Limited Reactions Balances in Terms of Molar Flow Rates Block 1: Mole Balances.

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Presentation transcript:

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

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 )ρ C 1)Mole Balance: A: In – out + generation = 0 R B = A: B: In – out – out membrane + generation = 0 B: XCXC XCXC TT endothermicexothermic A,B,C sweep F A0 B B A,C stay behind since they are too big H2H2 H2H2 C BS

Neglected most of the time Parameters: C TO = 0.2, F A0 = 5, k = 4, K C = , k C = 8 1) 2) 3) 4) Relative rates: 5) 6) 7) (isothermal, isobaric) 8) 9) 10)

Multiple Reactions SelectivityYield InstantaneousS D/U = r D /r U y D = r D /-r A OverallŜ D/U = F D /F U ŷ D = F D /(F A0 -F A)