CycloRook
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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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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.
CAUTION : Hobby Chemist, not Professional or even Amateur
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CycloRook
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Wouldn't 3Å give the best results?
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CycloRook
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Hello.
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Sulaiman
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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
CAUTION : Hobby Chemist, not Professional or even Amateur
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CycloRook
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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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Selectivity is relative. Cheaper sieves are generally less selective. But no seive is going to be 100% uniform.
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