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:

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 7

Today’s lecture Block 1: Mole Balances Block 2: Rate Laws Block 3: Stoichiometry Block 4: Combine California Professional Engineers Exam Exam is not curved, 75% or better to pass Problem

3

General Guidelines for California Problems Some hints: 1. Group unknown parameters/values on the same side of the equation example: [unknowns] = [knowns] 2. Look for a Case 1 and a Case 2 (usually two data points) to make intermediate calculations 3. Take ratios of Case 1 and Case 2 to cancel as many unknowns as possible 4. Carry all symbols to the end of the manipulation before evaluating, UNLESS THEY ARE ZERO 4

Gas Phase PFR Unknown: 5 The irreversible elementary reaction takes place in the gas phase in an isothermal tubular (plug-flow) reactor. Reactant A and a diluent C are fed in equimolar ratio, and conversion of A is 80%. If the molar feed rate of A is cut in half, what is the conversion of A assuming that the feed rate of C is left unchanged? Assume ideal behavior and that the reactor temperature remains unchanged. [From California Professional Engineering/Engineers Exam.]

Gas Phase PFR 6 Will the conversion increase or decrease? INCREASE: Slower Volumetric Rate (Reactants spend more time in the reactor DECREASE: Concentration of Reactant Diluted

Gas Phase PFR Assumptions: 1) Mole Balance: 2) Rate Law: 3) Stoichiometry: (gas phase) A  ½ B 7

Gas Phase PFR 4) Combine: 8

Gas Phase PFR Case 1: Case 2: 9 Take ratio of Case 2 to Case 1

Gas Phase PFR Most make this assumption to keep pressure the same, C T02 =C T01 10

Gas Phase PFR Solve with computer, X=

Mole Balance Rate Laws Stoichiometry Isothermal Design Heat Effects 12

End of Lecture 7 13