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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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.

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Presentation transcript:

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 2/12/2013 Semibatch Reactors Block 1: Mole Balances Block 2: Rate Laws Block 3: Stoichiometry Block 4: Combine Definition of Selectivity Semibatch Reactors

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

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

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

Semibatch Reactors 1) Mass Balance:

Semibatch Reactors 1) Mole Balance on Species A: [in] – [out] + [gen] = [acc]

Semibatch Reactors 1) Mole Balance on Species B:

Semibatch Reactors 1) Mass and Mole Balance Summary

Semibatch Reactors 2) Rate Laws 3) Stoichiometry 4) Parameters

Semibatch Reactors

Semibatch Reactors

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:

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

P6-6B - Semibatch Reactors Sodium Bicarbonate + Ethylene Chlorohydrin  Ethylene Glycol + NaCl + CO2 NaCHO3 + CH2OHCH2Cl  (CH2OH)2 + NaCl + CO2  A + B  C + D + CO2 

P6-6B - Semibatch Reactors Semibatch Reactors in terms of Moles A + B  C + D + CO2 Mole Balances Stoichiometry

Rest of the Polymath Statements Similar to Concentration Program Rate Laws Rest of the Polymath Statements Similar to Concentration Program

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

P6-6 Semibatch: Concentrations CA, CB, CC

Three Forms of the Mole Balances applied to Semibatch Reactors: Molar Basis Concentration Basis Conversion

Semibatch Reactors 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

Polymath Equations

End of Lecture 10