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Author: Subject: Fractional freezing to GAA
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[*] posted on 17-5-2022 at 04:23

Okay sorry, I indeed didn't read your post carefully and didn't think freezing 15% (if 100% efficient) from 75% was worth the trouble. next time I will try to assume a bit less.

What you have, both the 60% and the 75% is already quite concentrated. I would indeed suggest using some drying agent like Na2SO4 or MgSO4, decant or filter and then freeze. Molecular sieves will dissolve in acid.

If you don't have anhydrous salts but do have an oven you can bake the water out of both sodium and magnesium sulfate. When you start with low temperatures and slowly go up you can prevent the salts dissolving in their own water, thereby keeping the surface area high making the process faster. Microwaving the salts is faster but I can imagine larger amounts to be hard to microwave.
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[*] posted on 17-5-2022 at 06:35

Yes, I have MagSulf. My goal is to produce GAA, so those 15% is indeed of importance.
I'll try the freezing of a little bit larger quantities first, just need to get a new burette for titration. My old one broke. Decanting off and saving the 60% for subsequent distillation trials.
Thank you!
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