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j_sum1
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I don't understand how this works. Is it some kind of cold finger in a gas stream?
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Deathunter88
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The idea is you put your compound that you want to dry in the inner class chamber. Then you hook a round bottom flask and a condenser onto the outer
chamber. After that you can connect a drying tube or something to the third joint leading into the middle chamber where you placed your compound.
After that is all done, you choose a solvent that has a boiling point at the temperature you want to dry at. Say you have a heat sensitive compound
that decomposes above 60 degrees. Then a solvent you could use would be acetone, since it has a boiling point of 56 degrees. Since the tube with your
chemical is immersed in the vapor stream, it will be kept at a constant temperature (the BP of the solvent you use). Quite ingenious actually.
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j_sum1
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Quote: Originally posted by Deathunter88  |
The idea is you put your compound that you want to dry in the inner class chamber. Then you hook a round bottom flask and a condenser onto the outer
chamber. After that you can connect a drying tube or something to the third joint leading into the middle chamber where you placed your compound.
After that is all done, you choose a solvent that has a boiling point at the temperature you want to dry at. Say you have a heat sensitive compound
that decomposes above 60 degrees. Then a solvent you could use would be acetone, since it has a boiling point of 56 degrees. Since the tube with your
chemical is immersed in the vapor stream, it will be kept at a constant temperature (the BP of the solvent you use). Quite ingenious actually.
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So you need a drying tube with a female joint to make it function properly.
Or you could use a two neck flask, condenser and a thermometer well with a glass wool plug pushed half way down and some CaCl2 on top. 
i love these ingenious ideas people have come up with and thinking how I could achieve the same or similar result.
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Brom
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I found this in a small box labeled special cell B. Any ideas what it is designed for?
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diggafromdover
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If the wire is resistance wire, then the cell could be used in a device like a ketene generator.
Enjoying second childhood with REAL chemistry set.
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Brom
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Now that i think of it, i found some leads in the same drawer that i found the item in. Ill get them next time i go by and maybe it will help to
figure out what it is for sure.
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A Halogenated Substance
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I bought a piece of glassware from an antique shop that I found interesting today. I originally had thoughts of using it in part as a drying tube or
some kind distillation setup piece.
The owner said that to him, it looked like a piece of equipment used to brew moonshine (though I have no such interests).
Anyone know exactly what this is and perhaps some good lab applications for it?
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byko3y
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Looks like a burette blank to me.
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SgtAltek
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Any Ideas?
Found this in my chem lab, my teacher doesn't even know what it is.
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gdflp
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That looks like a Soxhlet extractor modified so that the material to be extracted is outside of the vapor path. In a normal Soxhlet, the chamber
containing the material to be extracted is heated by the vapor coming off the lower flask, something which is actually advantageous in many cases. It
can be undesirable though, so I would guess that it's basically a Soxhlet extractor for temperature sensitive compounds.
[Edited on 3-30-2017 by gdflp]
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100PercentChemistry
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Anyone know what this is? The clamps feel like tungsten.
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Panache
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The first two I believe Are the same device just different scales and configurations and they came from the same bulk lot.
The third one I have a bunch of different sizes etc, I'm guessing electrochemical thing?
The forth is my fav fuck knows whatitis item.
   
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Panache
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Fuck me 100%chemistry, I have one of those I have kept for about a decade, except the only have the glass part on the far right. No idea what it's
for!
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j_sum1
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For sale on eBay:
http://www.ebay.com/itm/Glass-Column-4-tube-Connections-350m...
Any ideas?
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RogueRose
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Milipore filter
I found this unit for sale and I'm not exactly sure how it works and want to verify it before I buy. The bottom piece that has the 40/35 joint and
vacuum port is the receiver - correct? What size paper would this use and can the filter paper/material be custom cut to be placed in there and can a
piece of cloth be used if large particles are only needed to be removed?
I found this for $10 + shipping which seems good - is there anything I should know about these before buying? anyone know what diameter paper this
would use?
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Mabus
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I work with a similar device.
The ground glass joint is connected to a thick Erlenmeyer flask with an external ground glass joint, while the lateral glass tube is for the vacuum
hose. Like this.
As for the filter paper used, I cannot say until I know the dimensions of the plastic ring which contains the fritted glass, the the unit I work with
accepts filter paper of Ø 45-50 mm. If you know the dimensions of the fritted glass and plastic ring, you can know what filter paper you can use, but
if your filter paper is too big, you can cut it to size, just make sure the filter paper surface is at minimum slightly bigger than the fritted glass,
because if it's smaller, it will not cover the space between the fritted glass and the plastic ring and the liquid will leak through that crack.
I haven't tried cloth, but given how thin the paper needs to be to prevent leaking, I would not recommend it.
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Harristotle
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I used one of these many years ago.
We used to put a 0.22um filter on the frit, seat the whole thing on top of a Buchner funnel, and connect it to water vac via another 0.22um filter.
Then we would filter sterilise our Eagles media + 10% fetal calf serum. We would use this for growing liver cells.
Now I think that they mostly are sold pre-mixed.
I still can feel the pieces of a pasteur pipette that is in my index finger, from when I tried to pull the glass pasteur pipette that we attached to
that same pump and used as an aspirator! Young and stupid once!
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RogueRose
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Thanks for the replies! That helps determine if it will be useful.
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NedsHead
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This one popped up on Gumtree Aus https://www.gumtree.com.au/s-ad/torrensville/miscellaneous-g...
looks to be mounted upside down as an ornament, any idea what it is?
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Sulaiman
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It looks like a three-phase mercury arc rectifier https://en.wikipedia.org/wiki/Mercury-arc_valve
CAUTION : Hobby Chemist, not Professional or even Amateur
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NedsHead
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Thanks Sulaiman that has to be it, I was wondering what the electrodes fitted in the arms were about, I've never heard of these old rectifiers, very
interesting
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keetrp
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glassware
Anyone know what this is used for ?
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gdflp
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Threads Merged
30-8-2017 at 13:52 |
SWIM
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How about this? It's got indentations like a Morton flask.
It's got an external jacket with hose fittings.
It's got 4 necks (two 10/30, two 24/40).
It's got a bottom exactly like a blender, complete with the blades and the splined fitting on the bottom to drive it.
It won't fit my blender's base, but I think it would actually fit right on some larger ones I've seen.
It looks like it's for making really sciencey milkshakes.
I just can't figure what you'd do that would require all these features on one item.
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j_sum1
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Looks to me like a reaction vessel for when you want good temperature control and strong stirring. I don't see anything particularly strange about
it.
You might also consider that the vessel and lid might be interchangeable with other equipment. IOW, someone wanted a jacketed stirring vessel and
needed more than two necks and so picked off the shelf a configuration that would work for them.
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SWIM
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It's the sharp steel blades in the bottom that I find strange.
But thanks for your input, it gave me new insights on various things.
[Edited on 7-9-2017 by SWIM]
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