Lecture 18 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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Presentation transcript:

Lecture 18 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.

Web Lecture 18 Class Lecture 23–Tuesday Catalytic Mechanisms Data Analysis Chemical Vapor Deposition (CVD)

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

Catalytic Mechanisms

Catalytic Mechanisms

Catalytic Mechanisms

Catalytic Mechanisms

Catalytic Mechanisms Where KA = 4 atm–1 and KC = 6 atm–1 1) 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?

Catalytic Mechanisms

Catalytic Mechanisms 1) At X = 0.5 2) At an equal concentrations of A and C sites, the conversion will be

Dimethyl Either 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.

Chemical Reaction Engineering in the Electronics Industry

Chemical Reaction Engineering in the Electronics Industry Czochralski Crystal Growth – Heat Transfer Doping of n/p junction – Diffusion ChE 344 Chemical Vapor Deposition (Catalysis Analogy) Photo Resist Formation Photo Resist Dissolution Etching The 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

Chemical Reaction Engineering in the Electronics Industry

Chemical Vapor Deposition

Chemical Vapor Deposition

Chemical Vapor Deposition 1) Mechanism Gas Phase Homogeneous Heterogeneous

Chemical Vapor Deposition 2) Rate Limiting Step 3) Express fi in terms of Pi 4) Area Balance

Chemical Vapor Deposition 4) Area Balance 5) Combine

Homogeneous Reaction

End of Web Lecture 18 End of Class Lecture 23