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Lecture 10

Lecture 10. Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors in which they take place. Lecture 10 – Tuesday 2/8/2011. Definition of Selectivity Instantaneous S D / U = r D / r U

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Lecture 10

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  1. Lecture 10 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors in which they take place.

  2. Lecture 10 – Tuesday 2/8/2011 • Definitionof Selectivity • Instantaneous SD/U = rD/rU • Overall = FD/FU • SemibatchReactors

  3. Selectivity in Multiple Reactions KeepCA high and CBlow.

  4. Semibatchreactors • Semi Batchreactorscan be veryeffective in maximizingselectivity in liquidphasereactions. • The reactant that starts in the reactor is always the limitingreactant.

  5. Semibatchreactors B, v0 Semibatch reactors A + B → C + D Initial V A Liquid level and volume increase

  6. Semibatchreactors MassBalance:

  7. Semibatch • Mole balances: Species A: [in] – [out] + [gen] = [acc]

  8. Semibatch • Mole balances: Species B:

  9. Semibatch

  10. Semibatch 2) Rate Law: 3) Stoichiometry: 4) Parameters:

  11. Semibatch

  12. Semibatch

  13. EquilibriumConversion in Semibatch Reactors with Reversible Reactions Consider the following reaction: Everything is the same as for the irreversible case, except for the rate law:

  14. EquilibriumConversion in Semibatch Reactors with Reversible Reactions Where: At equilibrium, then Xe changes with time.

  15. Semibatch P6-6B Soldium Bicarbonate+Ethylene ChrolohydrinEthylen Glycol+NaCl+CO2 NaCHO3 + CH2OHCH2Cl  (CH2OH)2 + NaCl + CO2 A + B  C + D + CO2

  16. Semibatch Balance in Terms of Moles A + B  C + D + CO2

  17. Rest of the Polymath Statements Similar to Concentration Program

  18. P6-6 Semibatch: Moles, Na, Nb, etc.

  19. P6-6 Semibatch: Concentrations CA, CB, CC

  20. SemiBatchReactors Three Forms of the MoleBalanceapplied to Semi BatchReactors: Molar Basis Concentration Basis Conversion

  21. Consider the followingelementaryreaction: A+B  C+D -rA=kCACB The combined Mole Balance, Rate Law, and Stoichiometry may be written in terms of number of moles, conversion, and/or concentration:

  22. Polymath Equations:

  23. End of Lecture 10

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