Lecture 21 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 21 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.

Today’s lecture CSTR With Heat Effects Multiple Steady States Ignition and Extinction Temperatures

CSTR with Heat Effects Courtesy of Pfaudler, Inc.

Unsteady State Energy balance Neglect Using

Unsteady State Energy balance We obtain after some manipulation: Collecting terms with and high coolant flow rates, and

Unsteady State Energy balance

Unsteady State Energy balance

Unsteady State Energy balance If G(T) > R(T) Temperature Increases If R(T) > G(T) Temperature Decreases

Steady State Energy balance for CSTRs At Steady State Solving for X.

Steady State Energy balance for CSTRs Solving for X Solving for T

Energy balance for CSTRs

Energy balance for CSTRs

Energy balance for CSTRs R(T) T Variation of heat removal line with inlet temperature. Increasing T0

Energy balance for CSTRs R(T) T0 Ta T κ=∞ κ=0 Increase κ Variation of heat removal line with κ (κ=UA/CP0FA0)

1) Mole Balance: 2) Rate Law:

3) Stoichiometry: 4) Combine:

Multiple Steady States (MSS) Variation of heat generation curve with space-time.

Multiple Steady States Finding Multiple Steady States with T0 varied

Multiple Steady States Finding Multiple Steady States with T0 varied

Temperature ignition-extinction curve Multiple Steady States Temperature ignition-extinction curve

Stability of multiple state temperatures Multiple Steady States Stability of multiple state temperatures

MSS - Generating G(T) and R(T) Need to solve for X after combining mole balance rate law and stoichiometry.

MSS - Generating G(T) and R(T) For a first order irreversible reaction Parameters Then plot G and R as a function of T.

End of Lecture 21