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CHE 354 Chemical Reactor Design

CHE 354 Chemical Reactor Design. The General Mole Balance & Ideal Reactors. F A0. F A. What do we do with this term?. Example of Reactor Design. In – Out + Generation = Accumulation. F A0. F A. As D V goes to zero and M goes to infinity:.

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CHE 354 Chemical Reactor Design

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  1. CHE 354 Chemical Reactor Design The General Mole Balance &Ideal Reactors

  2. FA0 FA What do we do with this term? Example of Reactor Design In – Out + Generation = Accumulation

  3. FA0 FA As DV goes to zero and M goes to infinity: Divide reactor into little regions, small enough that intensive variables (CA, T, P) do not vary within. The Generation Term

  4. The General Mole Balance Let’s apply it to the three ideal reactors!

  5. Batch Reactor Perfectly mixed No flow in or out

  6. No flow in No flow out Perfectly mixed Batch Reactor

  7. Batch Reactor And if the volume is not a function of time (constant)

  8. Team Exercise What does design equation (mole balance) look like for a semi-batch reactor - continuous flow of Reactant A, Reactant B, or Product P?

  9. Continuous Stirred Tank ReactorCSTR Perfectly mixed Steady state

  10. Steady state Perfectly mixed CSTR

  11. CSTR What would the design equation look like at startup and with some spatial variations?

  12. Plug Flow ReactorPFR No radial gradients – only axial Steady state

  13. Steady state PFR This is the integral form. Often the differential form is more useful. Take the derivative with respect to volume of each term.

  14. PFR Derivative of a constant is just 0 rA

  15. Here is where some complication sets in: PFR

  16. Example 1-1 Assume isomerization is first order with k = 0.23 min-1 What volume PFR and CSTR are required for 90% conversion and 10 L/min?

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