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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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 23

Web Lecture 23 Class Lecture 21 - Tuesday 3/22/2011 CSTR With Heat Effects Multiple Steady States Ignition and Extinction Temperatures 2

Courtesy of Pfaudler, Inc. 3

Using Neglect 4

We obtain after some manipulation: Collecting terms with and high coolant flow rates,and 5

6

7

8 If G(T) > R(T) Temperature Increases If R(T) > G(T) Temperature Decreases

At Steady State 9 Solving for X.

Solving for X Solving for T 10

11

12

R(T) T Variation of heat removal line with inlet temperature. Increasing T 0 13

R(T) T0T0 TaTa T κ =∞ κ =0 Increase κ Variation of heat removal line with κ ( κ =UA/C P0 F A0 ) 14

15

16

Variation of heat generation curve with space-time. 17

Finding Multiple Steady States with T 0 varied 18

Finding Multiple Steady States with T 0 varied 19

Temperature ignition-extinction curve 20

Stability of multiple state temperatures 21

Need to solve for X after combining mole balance rate law and stoichiometry. 22

For a first order irreversible reaction Parameters Then plot G and R as a function of T. 23

24