Transcription of Continuous Stirred Tank Reactors (CSTRs)
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Continuous Stirred Tank Reactors (CSTRs)
chemical and Biological Reaction engineering , Spring 2007 Prof. William H. Green Lecture 5: Continuous Stirred Tank Reactors (CSTRs) This lecture covers: reactions in a perfectly Stirred tank. Steady State CSTR. Continuous Stirred Tank Reactors (CSTRs) Continuous Plug Flow Reactor CSTR Open system Steady State Well mixed Open system Steady State Continuous Batch Close system Well mixed Transient In terms of conversion, XA? Mole Balance on Component A In-Out+Production=Accumulation FF(steady state) Ao +ArAV=0 What volume do you need for a certain amount of conversion? FXV=AoA rAwhere rA is evaluated at the reactor concentration. This is the same as the exit concentration because the system is well mixed. For a liquid phase with constant P: FC=( =volumetric flow rate) AoAov00vFFAo VF==AAFAo XAF rAoAFigure 2. A batch reactor. Figure 1. A plug flow reactor, and Continuous Stirred tank reactor.
1st order reaction kinetics C C A0 A1 = 1+Da1 For the second reactorÆ iterate ()( ) C C A0 A2 = 11++Da12Da If the CSTRs are identical, () C CAn = A0 1+Da n Æ many CSTRs in series looks like a plug flow reactor. 10.37 Chemical and Biological Reaction Engineering, Spring 2007 Lecture #5 Prof. William H. Green Page 4 of 4
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