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 2/8/2011 Definition of Selectivity Instantaneous SD/U = rD/rU Overall = FD/FU 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 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.

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

Semibatch reactors Mass Balance:

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

Semibatch Mole balances: Species B:

Semibatch

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

Semibatch

Semibatch

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.

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

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

Rest of the Polymath Statements Similar to Concentration Program

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

P6-6 Semibatch: Concentrations CA, CB, CC

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

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