1. 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

7. Membrane Reactors • Dehydrogenation Reaction: • C3H8↔ H2 + C3H6 A ↔ B + C • Thermodynamically Limited: • W = ρbV • ρb = (1-ϕ)ρC • Mole Balance: A: In – out + generation = 0 • RB = A: • B: In – out – out membrane + generation = 0 • B: exothermic endothermic XC XC sweep B T T FA0 A,B,C H2 H2 CBS B A,C stay behind since they are too big

8. 1) 2) 3) 4) Relative rates: 5) 6) 7) (isothermal, isobaric) 8) 9) 10) Neglected most of the time Parameters: CTO = 0.2, FA0= 5, k = 4, KC = 0.0004, kC = 8

9. Multiple Reactions