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Lecture 10 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors.

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Presentation on theme: "Lecture 10 Chemical Reaction Engineering (CRE) is the field that studies the rates and mechanisms of chemical reactions and the design of the reactors."— Presentation transcript:

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 Definition of Selectivity
Instantaneous SD/U = rD/rU Overall = FD/FU Semibatch Reactors

3 Selectivity in Multiple Reactions
Yield Instantaneous SD/U = rD/rU Overall ŜD/U = FD/FU Keep CA high and CB low.

4 Semibatch reactors Semi Batch reactors can be very effective in maximizing selectivity in liquid phase reactions. The reactant that starts in the reactor is always the limiting reactant.

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

6 Semibatch reactors Mass Balance:

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 Equilibrium Conversion 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 Equilibrium Conversion 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

20

21

22 P6-6 Semibatch: Concentrations CA, CB, CC

23

24

25 Semi Batch Reactors Three Forms of the Mole Balance applied to Semi Batch Reactors: Molar Basis Concentration Basis Conversion

26 Consider the following elementary reaction: 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: Conversion Concentration No. of Moles

27 Polymath Equations:

28 End of Lecture 10

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