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CHEE 321: Chemical Reaction Engineering Module 3: Isothermal Reactor Design (Chapter 4, Fogler)

CHEE 321: Chemical Reaction Engineering Module 3: Isothermal Reactor Design (Chapter 4, Fogler). Example Problem : A packed bed micro-reactor for ‘ hydrogen production ’. Class Problem #5: PBR Micro-reactor. Picture source: www.mikroglas.com/.

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CHEE 321: Chemical Reaction Engineering Module 3: Isothermal Reactor Design (Chapter 4, Fogler)

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  1. CHEE 321: Chemical Reaction EngineeringModule 3: Isothermal Reactor Design(Chapter 4, Fogler)

  2. Example Problem:A packed bed micro-reactor for ‘hydrogen production’

  3. Class Problem #5: PBR Micro-reactor Picture source: www.mikroglas.com/ Micro-structured reactors are gaining importance in chemical engineering applications. One potential application of compact micro-reactor is for “on-board” production of hydrogen for fuel cell applications. In this particular problem, production of Hydrogen via catalytic “methanol decomposition” in a channeled micro-reactor (circular cross-section) packed with catalyst particle will be considered.

  4. Class Problem #5: PBR Micro-Reactor Reaction: CH3OH  CO + 2H2 Operation Data Temperature: 1000 K Inlet Pressure: 1.5 atm Feed: Pure methanol Total molar flow rate = 1 x 10-7 mol/s Reactor information Number of channels = 10 channel diameter 400 mm = 4 x10-4 m channel length = 5 cm = 0.05 m porosity = 0.3 Catalyst Information Material: Cu on alumina dp =40 mm c=1400 kg/m3

  5. PBR Micro-Reactor: Schematic Representation Dia = 400 mm Equal distribution of flow in 10 channels FTO/10 = 6 x 10-8 mol/s 5 cm or 0.05 m Po = 1.5 atm (yCH3OH)0 = 1 FTO = 1 x 10-7 mol/s

  6. Isothermal T = To Class Problem #5: PBR Micro-Reactor [Solve for 1 channel only] 1. GMBE – Differential Form 2. Rate Law From Miszey et al (2001) 3. Stoichiometry

  7. Class Problem #5: PBR Micro-Reactor Stoichiometric Table Reaction:

  8. Class Problem #5: PBR Micro-Reactor From stoichiomteric table 3. Stoichiometry (contd.) The rate law is in terms of partial pressures, it would be useful to write partial pressure of components as a function of conversion X

  9. Class Problem #5: PBR Micro-Reactor 4. Combine – GMBE We need to substitute the rate law (in terms of X) into the following GMBE equation where the rate law is: Combined equation is

  10. Class Problem #5: PBR Micro-Reactor 5. Pressure drop equation

  11. Class Problem #5: PBR Micro-Reactor 6. Parameters Needed for Solving Mole Balance Equation

  12. Class Problem #5: PBR Micro-Reactor 7. Parameters Needed for Solving Pressure Drop Equation Where,

  13. Class Problem #5: PBR Micro-Reactor 7. Parameters Needed for Solving Pressure Drop Equation f =0.3

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