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Polymethyl Methacrylate Production: Methanol Separation

mma optimization aspen hysys

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#1 dougedouge

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Posted 10 March 2021 - 05:06 AM

Hi all, im doing my fydp now. Need some advice on certain things.

first:

im doing an extraction of methonal and water on a liq-liq extractor in hysys. my solvent chosen is n-hexane. for some reason my n-hexane is not extracting methanol out. I have checked my binary coefficient against aspen plus and it is correct. Can you give me some advice on what i should do in order for my n-hexane to separate out more methanol? 

 

 

attached are photos of my current stream data.


thank you!

 

 

 

Attached Files



#2 breizh

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Posted 10 March 2021 - 06:08 AM

Hi,

Why don't you try to increase the solvent flowrate ? 

Are you sure the solvent used is the best for this process ? still a lot of water on top of the column!

my 2 cents

Breizh 


Edited by breizh, 10 March 2021 - 07:42 PM.


#3 Pilesar

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Posted 10 March 2021 - 07:27 AM

Look at the ternary diagram and map the residue curves to check if you are in the correct region of concentrations. It is difficult (for me anyway) to simulate extractive distillations by guessing at concentrations.



#4 Pilesar

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Posted 10 March 2021 - 07:35 AM

Here is a good short tutorial on residue curves:  https://www.chemstat...les/RESIDUE.PDF



#5 dougedouge

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Posted 10 March 2021 - 10:16 AM

thanks all for ur inputs, i will look into all those  :)






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