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Precipitation Reaction

struvite cfd simulation precipitation

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#1 Rhythm

Rhythm

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Posted 02 September 2015 - 06:52 AM

Hi folks,

 

I am creating a OpenFOAM CFD solver for struvite precipitation, unfortunately my focus last 5 years was in Mathematical Physics so I am a bit rusty with my chemistry.

 

So struvite reaction: Mg2+(aq)+ NH4+(aq)+HnPO43-n(aq)+ 6H2O(l) -> MgNH4PO4 * 6 H2O (s) +nH+(aq)

 

In order to choose the correct computational model, I'm trying to understand thermodynamics of struvite reaction - whther it is exothermo, endothermal or thermoneutral.

 

My initial understanding was that precipitation reactions are thermoneutral, unfortunately I couldn't find ways to model that, hence decided to seek for some help.

 

Cheers,

Rhythm

 

P.S.: let me know if there's any additional info that I need to provide

 



#2 PingPong

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Posted 02 September 2015 - 01:00 PM

My initial understanding was that precipitation reactions are thermoneutral
Why would that be so? Where did you read that?

 

For every reaction, so also for this struvite reaction, the Enthalpy of Reaction is calculated from the Enthalpy of Formation of all products and reactants.

 

But you may be able to find the Enthalpy of Reaction via google, without having to do the math yourself.



#3 Lucian Gomoescu

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Posted 23 October 2015 - 12:41 PM

Hello,

 

You can check the link below in order to get an idea about the system thermodynamics.

 

http://oatao.univ-to...anhoun_4645.pdf
 

I have to mention that the reaction posted above is reversible. Otherwise, pH of solution would have no effect on the struvite precipitation. :)






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