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Join Date: Oct 2018
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Reactive Flash

10/09/2018 10:25 AM

Hi all,

I have a few questions about a type of flash column that I never encountered in textbooks: the reactive flash. Let's suppose I have a equilibrium-limited reaction of the type A + B ↔ C + D

Let's imagine we know the equilibrium constant K and the entry molar fractions zA and zB as well as the feed flow rate F. Outlet will be composed of A, B, C and D in both liquid (L, xi molar fraction of each component) and vapour stream (V, yi molar fraction of each component).

We can suppose - I guess - that the reaction takes places in the liquid phase.

To be honest, I don't really know how I could write the mass balance equation. I would write F = V + L, but I guess I missed a reaction term. How could I write this?

Same with the other equation, F zi = Lxi + Vyi, because otherwise the only solution would be (zi = 0, xi = 0, yi = 0) for all i = A, B, C, D, which is trivial but not the one I accept obviously.

Thanks for your help!

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#1

Re: Reactive Flash

10/09/2018 12:31 PM
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#2
In reply to #1

Re: Reactive Flash

10/09/2018 3:37 PM

Thanks for the link. I actually encountered this paper while looking on the web but I didn't go too much into it since it seemed quite complex. Do you think it's the only way of solving the problem?

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#3
In reply to #2

Re: Reactive Flash

10/09/2018 4:34 PM

Maybe somebody will come along and dumb-it-down for you....not my area of expertise...but I think if you hope to actually understand this process, it might take a bit of reading and contemplation...perhaps even some field work and experimentation...

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#4
In reply to #3

Re: Reactive Flash

10/10/2018 7:15 AM

Thanks. Yes, if any of you knows how to do it would really help me... In the paper they say at the end that it is an alternative method so I suppose there is another one. I would like to try to understand it and implement it (using Matlab or other) using the basic material balance equations but including the reactive term.

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