Rainwater
National Hazard
Posts: 937
Registered: 22-12-2021
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Mood: Break'n glass & kick'n a's
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3A Molecular Sieve
I would like advice on testing the quality of 3A Molecular sieves.
Would these simple measurements accurately rate the product?
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1) first observations
Initial sample weight :
Size :
2) after drying at 550c for 2 hours open air (per instructions)
Weight after activation :
3) hydration test, add an equal mass of water
Initial water mass :
Initial water temperature :
Initial sample mass :
Peek temperature :
Time to peek tempature :
After 1 hour
Final water mass :
Final sample mass :
4) methanol drying test, add an equal mass of methanol previously dried over anhydrous magnesium sulfate
Initial CH₃OH mass :
Initial CH₃OH temperature :
Initial sample mass :
Peek temperature :
Time to peek tempature :
After 1 hour
Final CH₃OH mass :
Final sample mass :
5) ethanol drying, add an equal mass of 96%/vol azeotropic ethanol tested with hydrometer (everclear)
Initial CH₃CH₂OH mass :
Initial CH₃CH₂OH temperature :
Initial CH₃CH₂OH hydrometer reading :
Initial sample mass :
Peek temperature :
Time to peek tempature :
After 1 hour
Final CH₃CH₂OH mass :
Final sample mass :
Final CH₃CH₂OH hydrometer reading :
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Long version:
So i ordered an amazon "sponsored" product and Its my first time buying sieve. I plan of doing some simple solvent drying
The price is 1/16th what sigma aldrich is asking per gram.
I fully expect substandard performance
Exact item:
Wisesorb 6 LBS 3A Molecular Sieve Desiccant Beads, Dehumidifier Moisture Absorbers, 3 Pack of 2 LBS https://a.co/d/jbJlNX0
After watching/reading these I plan on filling out the above sheet. I think it covers most of what has been discussed in the links below.
https://youtu.be/HK5m2PDeyW0
https://youtu.be/MduzjhRHBFY
https://youtu.be/CmKGt92oMYU
https://www.sciencemadness.org/whisper/viewthread.php?tid=15...
https://www.sciencemadness.org/whisper/viewthread.php?tid=80...
https://www.sciencemadness.org/whisper/viewthread.php?tid=24...
"You can't do that" - challenge accepted
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Sulaiman
International Hazard
Posts: 3721
Registered: 8-2-2015
Location: 3rd rock from the sun
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Just a thought
Based on my minimal experience,
quite a lot of liquid
(presumably dehydrated solvent)
is retained on the surface of sieves,
I personally have no remedy for this,
but if you could somehow centrifuge the wet sample
you may increase your measurement 'accuracy'
(and dried solvent recovery efficiency)
CAUTION : Hobby Chemist, not Professional or even Amateur
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Rainwater
National Hazard
Posts: 937
Registered: 22-12-2021
Member Is Offline
Mood: Break'n glass & kick'n a's
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These things are on their way back.
Grossly false advertised
The biggest solvent I have is Carbon Tetrachloride (break cleaner) and it acts just like water.
Getting super hot upon contact and boils
What do yall think?
Edit: lmfao the methanol sample now has a ph of 10. Sweet. This crap is just soda clay. Not even ziolite
Fully explaines the 550c reactivation temperature, the hydroxides have to be decomposed to the oxides, that methanol burns with a nice sodium yellow
flame.
[Edited on 8-6-2023 by Rainwater]
"You can't do that" - challenge accepted
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