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Author: Subject: Loving My Vacuum filtration setup
averageaussie
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[*] posted on 12-8-2024 at 15:16


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chloric1
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[*] posted on 12-8-2024 at 16:06


Could someone delete this thread? Something went awry



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ThatChemist89
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[*] posted on 31-8-2024 at 14:23


sup
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yobbo II
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[*] posted on 31-8-2024 at 14:30


Quote: Originally posted by averageaussie  
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I think centrifuging is a much underused method of of seperating solids and liquids.
A guy here made one from and upturned bicycle.

Centrifuge and decant :cool:

Yob
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Rainwater
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[*] posted on 31-8-2024 at 17:05


I use a box fan layed on its back



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HydrogenFluoride
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[*] posted on 31-8-2024 at 20:18


Quote: Originally posted by Rainwater  
I use a box fan layed on its back

I have not heard of that method before, but I quite like how it sounds. I bet that its performance will blow me away! I will have to test it out sometime
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chloric1
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[*] posted on 1-9-2024 at 17:52


Centrifuging and vacuum filtration operation on the same principle. Pressure or force is applied to the precipitate to squeeze out the filtrate for efficient separation. Vacuum filtration is more compact and more easily portable so it can be used in field work if need be



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Boffis
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[*] posted on 2-9-2024 at 01:39


Of all my equipment that I have it is my vacuum filtration set-up that I use most often. I use a water ventury type vacuum pump and a range of Buchner flasks from 100ml to 3 L with a set of ceramic Buchner funnels that take filter papers from 20mm to 150mm. I also have a selection of Hirsch funnels and glass frit type funnels of various porosities and sizes.

They are so useful I just don't understand how anyone can do chemistry without such a set up. The sizes I use most frequently are the Buchner 4.25, 5,5 and 7cm size and the 2cm Hirsch funnel. If I were asked to recommend what equipment an amateur should buy first it would be a vacuum filtration set up! Most other basic kit can be repurposed from domestic untensils until you start distillations etc.
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[*] posted on 2-9-2024 at 03:17


Quote: Originally posted by Boffis  
Of all my equipment that I have it is my vacuum filtration set-up that I use most often...snip... so useful I just don't understand how anyone can do chemistry without such a set up...
I agree
A lot of people manage with just coffee filters or cotton wads, plus gravity,
but I like fine filtering,
and I'm too impatient to wait for gravity to do it's thing.
(except when I did some chemistry with gold I used mostly settling by gravity and decantation,
to minimise physical losses due to filtration,
so I suppose a centrifuge would be nice to have)




CAUTION : Hobby Chemist, not Professional or even Amateur
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yobbo II
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[*] posted on 2-9-2024 at 05:51



When filtering stuff like calcium sulphate where the ppt can be extremely fine, filtering can be very slow.
Centrifuging without a filter (just a container) and removing the liquid from the top of the solid can be useful.

Yob
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chloric1
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[*] posted on 2-9-2024 at 06:41


Quote: Originally posted by yobbo II  

When filtering stuff like calcium sulphate where the ppt can be extremely fine, filtering can be very slow.
Centrifuging without a filter (just a container) and removing the liquid from the top of the solid can be useful.

Yob


I am having an interesting experience with my current ammonium nitrate prep. About 98% of my calcium sulfate immediately precipitated with the appearance of wet drywall sludge as expected. But as I go to boil down the clear ammonium nitrate filtrate, it will spontaneously go cloudy with the dissolved calcium sulfate and I stop the stirring and heat to filter out what appears to be larger salt like crystals that are poorly soluble in water. What’s more, you can filter this version of calcium sulfate through a regular coffee filter via gravity filtration. I expect a gram or two of calcium sulfate each time I boil off 100 ml of water off the nitrate solution due to retrograde solubility.

I wonder if there is a way to grow nice gypsum crystals from ammonium nitrate solution?




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