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Two Cstr In Series


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#1 alibackrow

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Posted 21 August 2008 - 12:10 PM

Hi i was wondering if anyone would be able to help me with this problem. I saw it on an exam paper last semester but its been doing my head in ever since as i still have no idea how to do it. Any suggestions (or solutions) would be very much appreciated!

Thanks

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#2 Andree

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Posted 22 August 2008 - 06:53 AM

assuming that you change concentration cA0 only (flowrate is maintained constant) you will probably need to increase inlet concentration when temperature (and rate of reaction) increases to keep the cA2 on constant level... search the forum where I replied to similar post (CSTR-PFR-CSTR in series) - you will find necessary balance equation there

good luck smile.gif

#3 alibackrow

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Posted 22 August 2008 - 12:26 PM

Thanks for the quick post. Where does the rate equation come into play then?

#4 Andree

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Posted 24 August 2008 - 06:24 AM

QUOTE (alibackrow @ Aug 22 2008, 06:26 PM) <{POST_SNAPBACK}>
Thanks for the quick post. Where does the rate equation come into play then?


you need a balance fof substrate A, which in generaln is:
inflow - consumption (by chemical reaction) = outflow

#5 Andree

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Posted 24 August 2008 - 06:31 AM

inflow - consumption (by chemical reaction) = outflow

this is of course not a general formula as I wrote above, but simplified form for steady state...




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