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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.

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lecture 21

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
Today’slecture
  • CSTR With Heat Effects
    • Multiple Steady States
    • Ignition and Extinction Temperatures
cstr with heat effects
CSTR with Heat Effects

Courtesy of Pfaudler, Inc.

slide5

Unsteady State Energy balance

We obtain after some manipulation:

Collecting terms with and high coolant flow rates, and

unsteady state energy balance3
Unsteady State Energy balance

If G(T) > R(T) TemperatureIncreases

If R(T) > G(T) TemperatureDecreases

steady state energy balance for cstrs
Steady State Energy balance for CSTRs

At Steady State

Solving for X.

steady state energy balance for cstrs1
Steady State Energy balance for CSTRs

Solving for X

Solving for T

energy balance for cstrs2
Energy balance for CSTRs

Increasing T0

R(T)

Variation of heat removal line with inlettemperature.

T

slide14

Energy balance for CSTRs

κ=∞

R(T)

κ=0

T0

Increase κ

Ta

T

Variation of heat removal line with κ (κ=UA/CP0FA0)

slide15

1) Mole Balance:

2) Rate Law:

slide17

Multiple Steady States (MSS)

Variation of heat generation curve with space-time.

slide18

Multiple Steady States

Finding Multiple Steady States with T0 varied

slide19

Multiple Steady States

Finding Multiple Steady States with T0 varied

slide20

Multiple Steady States

Temperature ignition-extinction curve

slide21

Multiple Steady States

Stability of multiple state temperatures

slide22

MSS - Generating G(T) and R(T)

Need to solve for X after combining mole balance rate law and stoichiometry.

slide23

MSS - Generating G(T) and R(T)

For a first order irreversible reaction

Parameters

Thenplot G and R as a function of T.

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