Recycle CSTR

Ankur · science forum beginner Joined: 04 May 2006 Posts: 6

Hi All,

I would be grateful if somebody confirms my supposition. I have a
simulated ideal CSTR (constant volume & density, constant rate of
reactions, isothermal operation) operating without any recycle. It has
a known selectivity of products. If a recycle stream (based on volume
seperations only) from the outlet is introduced into the reactor inlet,
would there be change in selectivity of products. I guess no, because
of the assumption of ideal conditions in the CSTR, which already has an
infinite recycle ratio.

Thanks in advance
Ankur

p_bihari@yahoo.com · science forum beginner Joined: 03 May 2006 Posts: 13

Selectivity is generally a function of catalyst. However, if it is not
a catalytic reaction then you have only intrinsic selectivity of
reactant to products. That means reactant concn variation will affect
the selectivity. It doesnt depend on conditions in CSTR which are
physical properties howsoever ideally you operate it.

What is ur simulation result?
I am also not sure just asking to learn from ur experience.

Ankur · science forum beginner Joined: 04 May 2006 Posts: 6

Thanks for your reply. My reaction is not a catalytic reaction and the
definition of selectivity I use is 'ratio of the amount of desired
product to the total amount of products'. In a CSTR without recycle, I
have the selectivity results. However, if we have a recycle stream,
would it bring about a variation in the product conc in the reactor, as
compared to the previous case. I assume ideal conditions in the CSTR
(constant volume & density, isothermal and constant rate of reactions).

I wrote some dynamic model equations, which gives me that the recycle
ratio has no effect on the product concentrations. Would like a
confirmation or otherwise about it please.

Thanks
Ankur

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