lec07_02282007_w - 10.37 Chemical and Biological Reaction...

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10.37 Chemical and Biological Reaction Engineering, Spring 2007 Prof. K. Dane Wittrup Lecture 7: Batch Reactors This lecture covers batch reactor equations, reactor sizing for constant volume and variable volume processes. Batch Reactors Run at non-steady state conditions Which to choose? Batch vs. CSTR? CSTR Batch Figure 1. Schematics of a batch reactor and a CSTR. Small Amount of Material (small quantities) (does not tie up equipment continuously) Flexibility + - Expensive Reactants + - If product does not flow, + - Materials Handling (e.g. Polymers) Do not have to shut down and - + clean, less down time Captial costs? For size of reactor, + - for given conversion (concentration stays higher longer) Operability & Control (T, P, p4) - + e.g. Exothermic reaction (Manipulate only one setpoint, steady state. You can control additional variables. Such as flow rates.) Material Balance In – Out + Product = Accumulation 0 0 Cite as: K. Dane Wittrup, course materials for 10.37 Chemical and Biological Reaction Engineering, Spring 2007. MIT OpenCourseWare (http://ocw.mit.edu), Massachusetts Institute of Technology. Downloaded on [DD Month YYYY].
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dN r A V = A dt Constant V, dC r A A = dt In terms of conversion, dX Cr A Ao = dt A Integrating, t C A dC = A or C Ao r A tC
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This note was uploaded on 11/27/2011 for the course CHEMICAL E 10.302 taught by Professor Clarkcolton during the Fall '04 term at MIT.

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lec07_02282007_w - 10.37 Chemical and Biological Reaction...

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