+ ION
Harmless
Posts: 1
Registered: 24-10-2013
Member Is Offline
Mood: No Mood
|
|
Cheap Silica Source? (Column Chromatography)
A brief search of the web (and SM) leaves me disappointed with the price of column chromatography packing, at least what I can find (looking for
flash/gravity silica).
Any suggestions? With the exception of a listing on Amazon of all places, I can't seem to find better than $100 per kg.
Appreciate any suggestions/tips.
|
|
|
Mailinmypocket
International Hazard
Posts: 1351
Registered: 12-5-2011
Member Is Offline
Mood: No Mood
|
|
Check out seller "Chem-fox" on eBay. They sell it decently priced.
Note to self: Tare the damned flask.
|
|
|
NedsHead
Hazard to Others
Posts: 409
Registered: 9-12-2014
Location: South Australia
Member Is Offline
Mood: No Mood
|
|
cat litter? I think I have seen 100% silica kitty litter in supermarkets/pet shops
|
|
|
j_sum1
Administrator
Posts: 6325
Registered: 4-10-2014
Location: At home
Member Is Offline
Mood: Most of the ducks are in a row
|
|
Yes, but 100% silica gel according to supermarket label standards is probably not the same as 100% according to the standards one might want in a lab.
I know for example that they often contain colouring and a fragrance. The research I have done suggests that it is nigh on impossible to find out
exactly what is in the packet.
I intend to get some for a few different applications. But I would not trust analytical chromatography to a supermarket brand.
[Edited on 7-9-2015 by j_sum1]
|
|
|
macckone
Dispenser of practical lab wisdom
Posts: 2168
Registered: 1-3-2013
Location: Over a mile high
Member Is Offline
Mood: Electrical
|
|
Kitty litter is usually low silica due to the concern over silicosis.
|
|
|
FriedBrain
Harmless
Posts: 14
Registered: 10-8-2015
Location: Germany
Member Is Offline
Mood: No Mood
|
|
For column chromatography you need "high purity" Silica Gel, normally with a mesh of 60 to 400 and a pore size of 60 Å, or the seperation will be
crap. I'm not an expert in column chromatography, but what I know is that Kitty litter is as good for cc, as the normal use for it 
You always have time to do some chemistry, but maybe you just have other priorities?
|
|
|
ave369
Eastern European Lady of Mad Science
Posts: 596
Registered: 8-7-2015
Location: No Location
Member Is Offline
Mood: No Mood
|
|
Is silicate glue (a.k.a. waterglass) sold in your country? If yes, it's a cheap source of high grade silica. Take a big beaker, pour waterglass into
it, and add ethanol or acetone. You will see a white rubberous precipitation. Filter it off, wash away with water and calcine. What you've got is
pretty good dry silica gel.
Note: do not try to press or sculpt the precipitate while it's still rubberous. That's how you make boiling chips.
[Edited on 7-9-2015 by ave369]
Smells like ammonia....
|
|
|
papaya
National Hazard
Posts: 615
Registered: 4-4-2013
Member Is Offline
Mood: reactive
|
|
Add alcohol? How it's supposed to work?
|
|
|
battoussai114
Hazard to Others
Posts: 235
Registered: 18-2-2015
Member Is Offline
Mood: Not bad.... Not bad.
|
|
By dissolving the solvent and the binder leaving the non-soluble silica behind? Its a guess so beter wait for ave to answer.
|
|
|
Oscilllator
National Hazard
Posts: 659
Registered: 8-10-2012
Location: The aqueous layer
Member Is Offline
Mood: No Mood
|
|
MrHomeScientist has a youtube video called "Make pure silicon dioxide" where he covers the making of SiO2 from water glass. I haven't watched the
video recently however I believe he adds acid to the precipitate, then washes and calcines.
|
|
|
S.C. Wack
bibliomaster
Posts: 2419
Registered: 7-5-2004
Location: Cornworld, Central USA
Member Is Offline
Mood: Enhanced
|
|
Of course Brauer has a relevant entry, from the usual water glass solution. "Gels prepared according to the above directions are especially useful for
chromatographic purposes."
|
|
|
ave369
Eastern European Lady of Mad Science
Posts: 596
Registered: 8-7-2015
Location: No Location
Member Is Offline
Mood: No Mood
|
|
I have no idea how it works, but it works. I've prepared silica gel with this method. Apparently, organic solvents somehow catalyze the decomposition
of silicates.
Smells like ammonia....
|
|
|
Little_Ghost_again
National Hazard
Posts: 985
Registered: 16-9-2014
Member Is Offline
Mood: Baffled
|
|
I got kitty kitty litter cheap stuff no ingredients on pack but 3 x less price than branded stuff, all packs said clumping a few said no perfume (I
got a no perfume one) all said clumping, I got home opened it to discover I have 5Kg of.........Fucking clay! 
Dont ask me, I only know enough to be dangerous
|
|
|
Mailinmypocket
International Hazard
Posts: 1351
Registered: 12-5-2011
Member Is Offline
Mood: No Mood
|
|
You need to look for cat litter crystals, not just straight up cat litter. Some is tinted light blue whereas some is pure white. Some is also white
with the occasional blue crystals here and there, I think they change color when kitties box gets ripe. Either way they are big and most likely easy
to remove. Some crystals also have indicators to show if the cat has urinary problems or something like that, I'd avoid those too.
Note to self: Tare the damned flask.
|
|
|
Little_Ghost_again
National Hazard
Posts: 985
Registered: 16-9-2014
Member Is Offline
Mood: Baffled
|
|
Quote: Originally posted by Mailinmypocket  | You need to look for cat litter crystals, not just straight up cat litter. Some is tinted light blue whereas some is pure white. Some is also white
with the occasional blue crystals here and there, I think they change color when kitties box gets ripe. Either way they are big and most likely easy
to remove. Some crystals also have indicators to show if the cat has urinary problems or something like that, I'd avoid those too.
|
In our local super markets they dont have ones with windows in the bags. Most say zeolite or a few say contains silicon but these are normally branded
and alot more than what i paid for my multi size participles of bloody clay!
I will find a use for it and probably make the silicon dioxide with waterglass, I might have found a cheap source of that, I dont want to reuse the
column packing and have a lot of extractions lined up.
Thanks for the info at least now if I see someone with a cat who has a stinky tray with that in it I can ask where they got it
Dont ask me, I only know enough to be dangerous
|
|
|
Dr.Bob
International Hazard
Posts: 2736
Registered: 26-1-2011
Location: USA - NC
Member Is Offline
Mood: No Mood
|
|
I still have a few older chromatography quality silica gel cartridges (mostly small ones), mostly for obsolete flash systems, that I would be willing
to give away to anyone willing to pay the postage, must be within the US, don't want to ship white powders overseas... Mostly first come first
serve, but if people have specific research projects (not involving making meth) they will get preference, as will people who have published work here
or bought stuff from me before. Supplies are limited, no rain checks. These are mostly SG60, Merck type flash grade silica, no fluor indicator, as
they are not designed for TLC. Some are in 5 ml plastic cartridges, a few are in long plastic tubes (old Biotage design), and some are in SPE
cartridges. They are likely deactivated due to age, so they would be good for polar compounds... If anyone has an old HPLC in their basement, I
might be able to help you as well, but not many of those in people's garage (except maybe benzylchloride).
|
|
|
Dr.Bob
International Hazard
Posts: 2736
Registered: 26-1-2011
Location: USA - NC
Member Is Offline
Mood: No Mood
|
|
I found even more of these flash columns, some have almost 1/2 pound of flash grade silica gel in them, if anyone wants some to play with. For
anyone who wants to do real chromatography, this would be a way to be get started.
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
