Chemical Reaction Engineering PowerPoint Presentation

Chemical Reaction Engineering PowerPoint Presentation

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(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 18. Web Lecture 18. Class Lecture 23 – Tuesday 4/5/2011. ID: 640858

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Presentations text content in Chemical Reaction Engineering

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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 take place.

Lecture 18

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Web Lecture 18Class Lecture 23 – Tuesday 4/5/2011

Catalytic Mechanisms

Data Analysis

Chemical Vapor Deposition

2

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(a)  The initial rate of reaction is shown below           (A)                       (B)

                            

(C)

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Where K

A

= 4

atm

–1

and K

C = 6

atm–11) At what is the ratio of sites with A adsorbed to those sites with C adsorbed when the conversion is 50%?

2) What is the conversion when the sites with A adsorbed are equal to those with C adsorbed?

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1) At X = 0.5

2) At an equal concentrations of A and C sites, the conversion will be

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Dimethyl

Either

11

Initially water does not exit the reactor the same as DME because

Which of the following best describes the data

A

There is more DME than water.

B

Steady state has been reached.

C

Water reacts with ME.

D

Water is adsorbed on the surface.

Slide12

Dimethyl

Either

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Which of the following are true

The concentration of DME reaches a maximum because

A

the rate of reaction is very rapid initially.

B

all the sites are vacant initially so that (Methanol) ME is rapidly adsorbed.

C

there is very little water initially adsorbed on the surface.

D

DME is probably not on the surface.

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Chemical Reaction Engineering in the Electronics Industry

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Chemical Reaction Engineering in the Electronics Industry

ChE

342

Czochralski

Crystal Growth – Heat Transfer

Doping of n/p junction – DiffusionChE 344

Chemical Vapor Deposition (Catalysis Analogy) Photo Resist Formation Photo Resist Dissolution EtchingThe 5 steps 1. Postulate Mechanism (sometimes first includes a gas phase reaction( then adsorption, surface reaction and desorption)

2. Postulate Rate Limiting Step 3. Evaluate Parameters in Terms of Measured Variables 4. Surface Area Balance 5. Evaluate Rate Law Parameters

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Chemical Vapor

Desposition

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Chemical Vapor

Desposition

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1) Mechanism

Gas Phase

Homogeneous

Heterogeneous

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2) Rate Limiting Step

3) Express

f

i

in terms of P

i

4) Area Balance

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4) Area Balance

5) Combine

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Homogeneous Reaction

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End of Web Lecture 18

End of Class Lecture 23

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