Sulaiman
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Celite filter aid = diatomaceous earth (DE)
I have just been looking at DE on eBay,
Apparently the darker marine DE has heavy metal content,
so I was looking at the 'purer' fresh water white DE;
http://www.ebay.co.uk/itm/1Kg-Diatomaceous-Earth-DE-Pure-Whi...
Typical Chemical and Physical Analysis:
SiO2 94.2%,
Al2O3 2.5%,
Fe2O3 0.9%,
CaO 0.5%,
K2O 0.4%,
SO3 0.4%,
MgO 0.3%,
P2O5 0.3%,
Na2O 0.2%,
TiO2 0.2%,
Mn2O3 0.1%,
Specific Gravity 1.99,
Apparent Density 2.18,
Moisture 8.3%,
Water Absorption 90.9%,
Loss on Ignition 3.34%,
Porosity 64.5%,
Oil Absorption (30 mins) 58.0%,
Oil Absorption (72 hours) 66.3%,
Particle Size 400 mesh (<37 microns)
I have two questions;
1) does this look suitable ?
2) as it is DE rather than branded Celite, should I process this DE in any way before use ?
It seems odd to filter my reagents through such a chemical mix.
CAUTION : Hobby Chemist, not Professional or even Amateur
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JJay
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If you need something analytical grade, it's probably best to just buy some Celite.
That stated, you can improve the quality of that diatomaceous earth with acid washes and drying it at extremely high heat. Actually, I think that's
how they make Celite: http://www.sigmaaldrich.com/chemistry/chemical-synthesis/lea...
[Edited on 21-5-2017 by JJay]
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unionised
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One approach is to wash the stuff, just before you use it, with whatever you are filtering.
So, if you are about to filter a solution of something in ethanol, you wash the celite with ethanol before use.
Similarly, you acid wash it before filtering an acid solution.
(I'd not recommend it for strongly alkaline materials)
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Magpie
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FYI I bought my Celite at a swimming pool supply store. Only problem is I had to buy a 25 lb bag. It's cheap though.
It's used with swimming pool filters for the same purpose it's used in the lab.
The single most important condition for a successful synthesis is good mixing - Nicodem
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mr.crow
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The kind you use for killing bugs is NOT suitable for filtering. It turns into goop and the water turns brown.
Double, double toil and trouble; Fire burn, and caldron bubble
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Sulaiman
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Thanks for all the guidance,
I'll buy the lot that I pointed to and acid-wash it.
I'm guessing HCl then HNO3
CAUTION : Hobby Chemist, not Professional or even Amateur
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JJay
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I've used the bug killing kind before without incident, but I'm sure it does depend on exactly what kind you get.
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violet sin
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Wow is spendy 1kg for 6.71£ !! The swimming pool stuff is cheap like magpie says. 19$ for 25# last time around for me. Just got the pool filter
all cleaned up and epoxy for some repairs. Spent little under a 100$ on chlorine and acid to boot( 25# trichloro, 2gal muriatic). Nice to have stuff
around for experiments, as the beast always needs chlorine and I get to buy in bulk, but honestly I'd say <1% is ever used hobby wise.
Time to go epoxy some stuff and start cleaning, 18,000gal pool to filter free of sediment and dust. Getting warm here already, mid 80s and the 100+
will be here before you know it to steal 65 IQ pts. upon setting foot outside.
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