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 27

Web Lecture 27 Class Lecture 23 How Reaction Rate Varies with: 1. Temperature 2. Catalyst Particle Size 3. Eternal Flow Rate For A. Reaction Rate Limited Reactors B. Internal Diffusion Limited Reactions C. External Rate Limited Reactions And all 9 combinations of numbers and letters, Eq. 1A, 1B, 1C, 2A, 2B, 2C and 3A, 3B and 3C.

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Internal Diffusion How will we know these trends discussed in the last slide: 1. Solve the diffusion and reaction equation for catalyst particle for concentration gradient 6

2.Find the true rate of reaction as a function of the external and internal surface reactions. 7

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Internal Diffusion 9 =

Surface Reaction 10

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15 The Thiele modulus for this first order reaction is For a first-order reaction, Equation (15-19) becomes

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Figure E Damaged cartilage. (Figure courtesy of Newsweek, September 3, 2001.) 22

23 Diffusion of O 2 around collagen

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