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Phase Equilibrium Determination


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#1 juggernaut621

juggernaut621

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Posted 13 November 2015 - 08:40 PM

Hi Folks,

 

I am conducting experiments to determine the binodal curve for a system containing 3 components  - pyridine, water and pyridine N-oxide. The system becomes biphasic when the concentration of pyridine N-oxide becomes very low. I am following a technique wherein I add water to a mixture of pyridine and pyridine N-oxide  till phase separation is seen.

 

The experiment is carried out in a small pilot scale reactor ( 1.2 L) which is connected to a dosing pump.The reactor is equipped with an anchor stirrer which provides through mixing.

 

The mixture turns turbid after the N-oxide concentration is reduced to a low value by addition of water. However, can turbidity be considered as the phase separation point? or Is there a small composition range before the turbid point where phase separation has already occurred? If so, how would one determine this point visually??

 

 



#2 MrShorty

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Posted 16 November 2015 - 10:14 AM

That is a significant question whenever you try to perform experiments like this using a visual technique. I would suggest that the best answer to this question is to use a "validation" type experiment where you use the same experimental protocols on a ternary system that has known phase behavior. By performing the experiment on a known system, you can explore this question.






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