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lec08_03022007_g - 10.37 Chemical and Biological Reaction...

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10.37 Chemical and Biological Reaction Engineering, Spring 2007 Prof. William H. Green Lecture 8: The Plug Flow Reactor rk [ ] 2 A =− A X AA Fr o A V [] () XF V o (2 nd order reaction) CSTR = kA 22 0 1 X A X t A react . = 0 1 X A VA Batch [ ] = 0 ? [ ] moles A F Batch 0 Ao = = time tt react + d F ⎡⎤ =+ Ao X Vt A Batch ⎢⎥ Ak d 00 ⎣⎦ A 1 X A Assume X A =90% If t react >t d then [] [] 2 F Ao 0.9 V Batch = A 1 0.9 0.9 F Ao 1.8 F V Ao CSTR =≤ Figure 1. Three tanks in series. V CSTR in r A v 0 If A [ A ] [ ] [ ] A == in in out 1 + Da kV 1 + v 0 If n CSTRs are in series: V each volume= n Cite as: William Green, Jr., 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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[ ] [] A A = in out ⎛⎞ kV n 1 + ⎜⎟ ⎝⎠ nv 0 Æ improves productivity: concentration of A in 1 st one is higher than would be in one large CSTR [] [] kV AA v 0 out = 0 e Batch kV =⇒ 3 95% conversions v 0 [ ] A N X A out = 0 A CSTR 3 n 1 .75 series 1 + n 10 .93 100 .948 Figure 2. Diagram of a plug flow reactor.
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lec08_03022007_g - 10.37 Chemical and Biological Reaction...

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