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CycloRook
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[*] posted on 16-3-2022 at 00:48
3Å molecular sieve suggestions ?

I want to buy some 3Å molecular sieves to dry solvents etc.

I don't have much experience so I want to choose correctly.

This is mostly a branding thing.

I would buy from sigma but they don't sell to individuals.

I'm just afraid of buying sieves that break apart or react with my experiments.

Does anyone have a good brand they recommend.

Thanks
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Sulaiman
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[*] posted on 16-3-2022 at 00:58


I can not help with suggestions for good quality
but if your application allows 4A sieves then I recommend
cheap (eBay, Amazon etc.) 3A sieves.
Give them a wash and dehydration cycle before use to remove dust,
and they will be usable.



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CycloRook
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[*] posted on 16-3-2022 at 05:56


Wouldn't 3Å give the best results?
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CycloRook
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[*] posted on 16-3-2022 at 16:37


Hello.
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Sulaiman
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[*] posted on 16-3-2022 at 17:46


both 3A and 4A sieves absorb water,
4A sieves will also absorb small molecules such as ethanol
so 3A sieves are more selective of water

I think tht the cheap '3A' sieves are meant for dessiction of the air in double-glazed windows etc. where 3A and/or 4A sieves are useful.

So using the cheap (Chinese) 3A sieves will absorb water
and possibly some of your solvent also.
For cheap solvents this is ok



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CycloRook
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[*] posted on 17-3-2022 at 01:01


Quote: Originally posted by Sulaiman  
both 3A and 4A sieves absorb water,
4A sieves will also absorb small molecules such as ethanol
so 3A sieves are more selective of water

I think tht the cheap '3A' sieves are meant for dessiction of the air in double-glazed windows etc. where 3A and/or 4A sieves are useful.

So using the cheap (Chinese) 3A sieves will absorb water
and possibly some of your solvent also.
For cheap solvents this is ok
I want to be selective of water.
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macckone
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[*] posted on 19-3-2022 at 14:48


Selectivity is relative. Cheaper sieves are generally less selective. But no seive is going to be 100% uniform.
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